StringBuilder.AppendFormat Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding object argument.
Overloads
AppendFormat(IFormatProvider, CompositeFormat, ReadOnlySpan<Object>) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider. |
AppendFormat(String, Object, Object, Object) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of three arguments. |
AppendFormat(IFormatProvider, String, Object, Object) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of two arguments using a specified format provider. |
AppendFormat(String, Object, Object) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of two arguments. |
AppendFormat(IFormatProvider, String, Object, Object, Object) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of three arguments using a specified format provider. |
AppendFormat(IFormatProvider, CompositeFormat, Object[]) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider. |
AppendFormat(String, ReadOnlySpan<Object>) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter span. |
AppendFormat(IFormatProvider, String, Object[]) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter array using a specified format provider. |
AppendFormat(IFormatProvider, String, Object) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a single argument using a specified format provider. |
AppendFormat(String, Object[]) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter array. |
AppendFormat(String, Object) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a single argument. |
AppendFormat(IFormatProvider, String, ReadOnlySpan<Object>) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter span using a specified format provider. |
AppendFormat<TArg0,TArg1,TArg2>(IFormatProvider, CompositeFormat, TArg0, TArg1, TArg2) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider. |
AppendFormat<TArg0,TArg1>(IFormatProvider, CompositeFormat, TArg0, TArg1) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider. |
AppendFormat<TArg0>(IFormatProvider, CompositeFormat, TArg0) |
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider. |
AppendFormat(IFormatProvider, CompositeFormat, ReadOnlySpan<Object>)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider.
public:
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::Text::CompositeFormat ^ format, ReadOnlySpan<System::Object ^> args);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, System.Text.CompositeFormat format, ReadOnlySpan<object?> args);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, System.Text.CompositeFormat format, scoped ReadOnlySpan<object?> args);
member this.AppendFormat : IFormatProvider * System.Text.CompositeFormat * ReadOnlySpan<obj> -> System.Text.StringBuilder
Public Function AppendFormat (provider As IFormatProvider, format As CompositeFormat, args As ReadOnlySpan(Of Object)) As StringBuilder
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- CompositeFormat
- args
- ReadOnlySpan<Object>
A span of objects to format.
Returns
A reference to this instance after the append operation has completed.
Exceptions
format
is null
.
The index of a format item is greater than or equal to the number of supplied arguments.
Applies to
AppendFormat(String, Object, Object, Object)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of three arguments.
public:
System::Text::StringBuilder ^ AppendFormat(System::String ^ format, System::Object ^ arg0, System::Object ^ arg1, System::Object ^ arg2);
public System.Text.StringBuilder AppendFormat (string format, object arg0, object arg1, object arg2);
public System.Text.StringBuilder AppendFormat (string format, object? arg0, object? arg1, object? arg2);
member this.AppendFormat : string * obj * obj * obj -> System.Text.StringBuilder
Public Function AppendFormat (format As String, arg0 As Object, arg1 As Object, arg2 As Object) As StringBuilder
Parameters
- format
- String
A composite format string.
- arg0
- Object
The first object to format.
- arg1
- Object
The second object to format.
- arg2
- Object
The third object to format.
Returns
A reference to this instance with format
appended. Each format item in format
is replaced by the string representation of the corresponding object argument.
Exceptions
format
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to 3.
The length of the expanded string would exceed MaxCapacity.
Examples
The following example demonstrates the AppendFormat method.
using namespace System;
using namespace System::Text;
using namespace System::Globalization;
void Show( StringBuilder^ sbs )
{
Console::WriteLine( sbs );
sbs->Length = 0;
}
int main()
{
StringBuilder^ sb = gcnew StringBuilder;
int var1 = 111;
float var2 = 2.22F;
String^ var3 = "abcd";
array<Object^>^var4 = {3,4.4,(Char)'X'};
Console::WriteLine();
Console::WriteLine( "StringBuilder.AppendFormat method:" );
sb->AppendFormat( "1) {0}", var1 );
Show( sb );
sb->AppendFormat( "2) {0}, {1}", var1, var2 );
Show( sb );
sb->AppendFormat( "3) {0}, {1}, {2}", var1, var2, var3 );
Show( sb );
sb->AppendFormat( "4) {0}, {1}, {2}", var4 );
Show( sb );
CultureInfo^ ci = gcnew CultureInfo( "es-ES",true );
array<Object^>^temp1 = {var2};
sb->AppendFormat( ci, "5) {0}", temp1 );
Show( sb );
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
using System;
using System.Text;
using System.Globalization;
class Sample
{
static StringBuilder sb = new StringBuilder();
public static void Main()
{
int var1 = 111;
float var2 = 2.22F;
string var3 = "abcd";
object[] var4 = {3, 4.4, 'X'};
Console.WriteLine();
Console.WriteLine("StringBuilder.AppendFormat method:");
sb.AppendFormat("1) {0}", var1);
Show(sb);
sb.AppendFormat("2) {0}, {1}", var1, var2);
Show(sb);
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3);
Show(sb);
sb.AppendFormat("4) {0}, {1}, {2}", var4);
Show(sb);
CultureInfo ci = new CultureInfo("es-ES", true);
sb.AppendFormat(ci, "5) {0}", var2);
Show(sb);
}
public static void Show(StringBuilder sbs)
{
Console.WriteLine(sbs.ToString());
sb.Length = 0;
}
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
open System.Text
open System.Globalization
let sb = StringBuilder()
let show (sbs: StringBuilder) =
printfn $"{sbs}"
sb.Length <- 0
let var1 = 111
let var2 = 2.22f
let var3 = "abcd"
let var4: obj[] = [| 3; 4.4; 'X' |]
printfn "StringBuilder.AppendFormat method:"
sb.AppendFormat("1) {0}", var1) |> ignore
show sb
sb.AppendFormat("2) {0}, {1}", var1, var2) |> ignore
show sb
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3) |> ignore
show sb
sb.AppendFormat("4) {0}, {1}, {2}", var4) |> ignore
show sb
let ci = CultureInfo("es-ES", true)
sb.AppendFormat(ci, "5) {0}", var2) |> ignore
show sb
// This example produces the following results:
// StringBuilder.AppendFormat method:
// 1) 111
// 2) 111, 2.22
// 3) 111, 2.22, abcd
// 4) 3, 4.4, X
// 5) 2,22
Imports System.Text
Imports System.Globalization
Class Sample
Private Shared sb As New StringBuilder()
Public Shared Sub Main()
Dim var1 As Integer = 111
Dim var2 As Single = 2.22F
Dim var3 As String = "abcd"
Dim var4 As Object() = {3, 4.4, "X"c}
Console.WriteLine()
Console.WriteLine("StringBuilder.AppendFormat method:")
sb.AppendFormat("1) {0}", var1)
Show(sb)
sb.AppendFormat("2) {0}, {1}", var1, var2)
Show(sb)
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3)
Show(sb)
sb.AppendFormat("4) {0}, {1}, {2}", var4)
Show(sb)
Dim ci As New CultureInfo("es-ES", True)
sb.AppendFormat(ci, "5) {0}", var2)
Show(sb)
End Sub
Public Shared Sub Show(sbs As StringBuilder)
Console.WriteLine(sbs.ToString())
sb.Length = 0
End Sub
End Class
'
'This example produces the following results:
'
'StringBuilder.AppendFormat method:
'1) 111
'2) 111, 2.22
'3) 111, 2.22, abcd
'4) 3, 4.4, X
'5) 2,22
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items, that correspond to arg0
through arg2
, the objects in the parameter list of this method. The formatting process replaces each format item with the string representation of the corresponding object.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. If there is no parameter in the index position, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
arg0
, arg1
, and arg2
represent the objects to be formatted. Each format item in format
is replaced with the string representation of either arg0
, arg1
, or arg2
, depending on the index of the format item. If the format item includes formatString
and the corresponding object in args
implements the IFormattable interface, then arg
x.ToString(formatString, null)
defines the formatting, where x is the index of the argument. Otherwise, arg
x.ToString()
defines the formatting.
If the string assigned to format
is "Thank you for your donation of {0:####} cans of food to our charitable organization." and arg0
is an integer with the value 10, the return value will be "Thank you for your donation of 10 cans of food to our charitable organization."
Notes to Callers
In .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(IFormatProvider, String, Object, Object)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of two arguments using a specified format provider.
public:
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::String ^ format, System::Object ^ arg0, System::Object ^ arg1);
public System.Text.StringBuilder AppendFormat (IFormatProvider provider, string format, object arg0, object arg1);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, string format, object? arg0, object? arg1);
member this.AppendFormat : IFormatProvider * string * obj * obj -> System.Text.StringBuilder
Public Function AppendFormat (provider As IFormatProvider, format As String, arg0 As Object, arg1 As Object) As StringBuilder
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- String
A composite format string.
- arg0
- Object
The first object to format.
- arg1
- Object
The second object to format.
Returns
A reference to this instance after the append operation has completed. After the append operation, this instance contains any data that existed before the operation, suffixed by a copy of format
where any format specification is replaced by the string representation of the corresponding object argument.
Exceptions
format
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to 2 (two).
The length of the expanded string would exceed MaxCapacity.
Examples
The following example uses the AppendFormat(IFormatProvider, String, Object, Object) method to display time and temperature data stored in a generic Dictionary<TKey,TValue> object. Note that the format string has three format items, although there are only to objects to format. This is because the first object in the list (a date and time value) is used by two format items: The first format item displays the time, and the second displays the date.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
public class Example
{
public static void Main()
{
CultureInfo culture = new CultureInfo("en-US");
StringBuilder sb = new StringBuilder();
Dictionary<DateTime, Double> temperatureInfo = new Dictionary<DateTime, Double>();
temperatureInfo.Add(new DateTime(2010, 6, 1, 14, 0, 0), 87.46);
temperatureInfo.Add(new DateTime(2010, 12, 1, 10, 0, 0), 36.81);
sb.AppendLine("Temperature Information:\n");
foreach (var item in temperatureInfo)
{
sb.AppendFormat(culture,
"Temperature at {0,8:t} on {0,9:d}: {1,5:N1}°F\n",
item.Key, item.Value);
}
Console.WriteLine(sb.ToString());
}
}
// The example displays the following output:
// Temperature Information:
//
// Temperature at 2:00 PM on 6/1/2010: 87.5°F
// Temperature at 10:00 AM on 12/1/2010: 36.8°F
open System
open System.Collections.Generic
open System.Globalization
open System.Text
let culture = CultureInfo "en-US"
let sb = StringBuilder()
let temperatureInfo = Dictionary<DateTime, Double>()
temperatureInfo.Add(DateTime(2010, 6, 1, 14, 0, 0), 87.46)
temperatureInfo.Add(DateTime(2010, 12, 1, 10, 0, 0), 36.81)
sb.AppendLine "Temperature Information:\n" |> ignore
for item in temperatureInfo do
sb.AppendFormat(culture, "Temperature at {0,8:t} on {0,9:d}: {1,5:N1}°F\n", item.Key, item.Value)
|> ignore
printfn $"{sb}"
// The example displays the following output:
// Temperature Information:
//
// Temperature at 2:00 PM on 6/1/2010: 87.5°F
// Temperature at 10:00 AM on 12/1/2010: 36.8°F
Imports System.Collections.Generic
Imports System.Globalization
Imports System.Text
Module Example
Public Sub Main()
Dim culture As New CultureInfo("en-US")
Dim sb As New StringBuilder()
Dim temperatureInfo As New Dictionary(Of Date, Double)
temperatureInfo.Add(#6/1/2010 2:00PM#, 87.46)
temperatureInfo.Add(#12/1/2010 10:00AM#, 36.81)
sb.AppendLine("Temperature Information:").AppendLine()
For Each item In temperatureInfo
sb.AppendFormat(culture,
"Temperature at {0,8:t} on {0,9:d}: {1,5:N1}°F",
item.Key, item.Value).AppendLine()
Next
Console.WriteLine(sb.ToString())
End Sub
End Module
' The example displays the following output:
' Temperature Information:
'
' Temperature at 2:00 PM on 6/1/2010: 87.5°F
' Temperature at 10:00 AM on 12/1/2010: 36.8°F
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items, that correspond to objects in the parameter list of this method. The formatting process replaces each format item with the string representation of the corresponding object.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. If there is no parameter in the index position, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
The provider
parameter specifies an IFormatProvider implementation that can provide formatting information for arg0
and arg1
. provider
can be any of the following:
A CultureInfo object that provides culture-specific formatting information.
A NumberFormatInfo object that provides culture-specific formatting information for
arg0
orarg1
if they are numeric values.A DateTimeFormatInfo object that provides culture-specific formatting information for
arg0
orarg1
if they are date and time values.A custom IFormatProvider implementation that provides formatting information for
arg0
andarg1
. Typically, such an implementation also implements the ICustomFormatter interface.
If the provider
parameter is null
, format provider information is obtained from the current culture.
arg0
and arg1
represent the objects to be formatted. Each format item in format
is replaced with the string representation of the object that has the corresponding index. If the format item includes formatString
and the corresponding argument implements the IFormattable interface, then the argument's ToString(formatString, provider)
method defines the formatting. Otherwise, the argument's ToString()
method defines the formatting.
Notes to Callers
IIn .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- How to: Define and Use Custom Numeric Format Providers
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(String, Object, Object)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of two arguments.
public:
System::Text::StringBuilder ^ AppendFormat(System::String ^ format, System::Object ^ arg0, System::Object ^ arg1);
public System.Text.StringBuilder AppendFormat (string format, object arg0, object arg1);
public System.Text.StringBuilder AppendFormat (string format, object? arg0, object? arg1);
member this.AppendFormat : string * obj * obj -> System.Text.StringBuilder
Public Function AppendFormat (format As String, arg0 As Object, arg1 As Object) As StringBuilder
Parameters
- format
- String
A composite format string.
- arg0
- Object
The first object to format.
- arg1
- Object
The second object to format.
Returns
A reference to this instance with format
appended. Each format item in format
is replaced by the string representation of the corresponding object argument.
Exceptions
format
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to 2.
The length of the expanded string would exceed MaxCapacity.
Examples
The following example demonstrates the AppendFormat method.
using namespace System;
using namespace System::Text;
using namespace System::Globalization;
void Show( StringBuilder^ sbs )
{
Console::WriteLine( sbs );
sbs->Length = 0;
}
int main()
{
StringBuilder^ sb = gcnew StringBuilder;
int var1 = 111;
float var2 = 2.22F;
String^ var3 = "abcd";
array<Object^>^var4 = {3,4.4,(Char)'X'};
Console::WriteLine();
Console::WriteLine( "StringBuilder.AppendFormat method:" );
sb->AppendFormat( "1) {0}", var1 );
Show( sb );
sb->AppendFormat( "2) {0}, {1}", var1, var2 );
Show( sb );
sb->AppendFormat( "3) {0}, {1}, {2}", var1, var2, var3 );
Show( sb );
sb->AppendFormat( "4) {0}, {1}, {2}", var4 );
Show( sb );
CultureInfo^ ci = gcnew CultureInfo( "es-ES",true );
array<Object^>^temp1 = {var2};
sb->AppendFormat( ci, "5) {0}", temp1 );
Show( sb );
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
using System;
using System.Text;
using System.Globalization;
class Sample
{
static StringBuilder sb = new StringBuilder();
public static void Main()
{
int var1 = 111;
float var2 = 2.22F;
string var3 = "abcd";
object[] var4 = {3, 4.4, 'X'};
Console.WriteLine();
Console.WriteLine("StringBuilder.AppendFormat method:");
sb.AppendFormat("1) {0}", var1);
Show(sb);
sb.AppendFormat("2) {0}, {1}", var1, var2);
Show(sb);
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3);
Show(sb);
sb.AppendFormat("4) {0}, {1}, {2}", var4);
Show(sb);
CultureInfo ci = new CultureInfo("es-ES", true);
sb.AppendFormat(ci, "5) {0}", var2);
Show(sb);
}
public static void Show(StringBuilder sbs)
{
Console.WriteLine(sbs.ToString());
sb.Length = 0;
}
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
open System.Text
open System.Globalization
let sb = StringBuilder()
let show (sbs: StringBuilder) =
printfn $"{sbs}"
sb.Length <- 0
let var1 = 111
let var2 = 2.22f
let var3 = "abcd"
let var4: obj[] = [| 3; 4.4; 'X' |]
printfn "StringBuilder.AppendFormat method:"
sb.AppendFormat("1) {0}", var1) |> ignore
show sb
sb.AppendFormat("2) {0}, {1}", var1, var2) |> ignore
show sb
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3) |> ignore
show sb
sb.AppendFormat("4) {0}, {1}, {2}", var4) |> ignore
show sb
let ci = CultureInfo("es-ES", true)
sb.AppendFormat(ci, "5) {0}", var2) |> ignore
show sb
// This example produces the following results:
// StringBuilder.AppendFormat method:
// 1) 111
// 2) 111, 2.22
// 3) 111, 2.22, abcd
// 4) 3, 4.4, X
// 5) 2,22
Imports System.Text
Imports System.Globalization
Class Sample
Private Shared sb As New StringBuilder()
Public Shared Sub Main()
Dim var1 As Integer = 111
Dim var2 As Single = 2.22F
Dim var3 As String = "abcd"
Dim var4 As Object() = {3, 4.4, "X"c}
Console.WriteLine()
Console.WriteLine("StringBuilder.AppendFormat method:")
sb.AppendFormat("1) {0}", var1)
Show(sb)
sb.AppendFormat("2) {0}, {1}", var1, var2)
Show(sb)
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3)
Show(sb)
sb.AppendFormat("4) {0}, {1}, {2}", var4)
Show(sb)
Dim ci As New CultureInfo("es-ES", True)
sb.AppendFormat(ci, "5) {0}", var2)
Show(sb)
End Sub
Public Shared Sub Show(sbs As StringBuilder)
Console.WriteLine(sbs.ToString())
sb.Length = 0
End Sub
End Class
'
'This example produces the following results:
'
'StringBuilder.AppendFormat method:
'1) 111
'2) 111, 2.22
'3) 111, 2.22, abcd
'4) 3, 4.4, X
'5) 2,22
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items, that correspond to arg0
and arg1
, the two objects in the parameter list of this method. The formatting process replaces each format item with the string representation of the corresponding object.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. If there is no parameter in the index position, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
arg0
and arg1
represent the objects to be formatted. Each format item in format
is replaced with the string representation of either arg0
or arg1
. If the format item includes formatString
and the corresponding object implements the IFormattable interface, then arg
x.ToString(formatString, provider)
defines the formatting, where x is the index of the argument. Otherwise, arg
x.ToString()
defines the formatting.
If the string assigned to format
is "Thank you for your donation of {0:####} cans of food to our charitable organization." and arg0
is an integer with the value 10, the return value will be "Thank you for your donation of 10 cans of food to our charitable organization."
Notes to Callers
In .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(IFormatProvider, String, Object, Object, Object)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of either of three arguments using a specified format provider.
public:
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::String ^ format, System::Object ^ arg0, System::Object ^ arg1, System::Object ^ arg2);
public System.Text.StringBuilder AppendFormat (IFormatProvider provider, string format, object arg0, object arg1, object arg2);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, string format, object? arg0, object? arg1, object? arg2);
member this.AppendFormat : IFormatProvider * string * obj * obj * obj -> System.Text.StringBuilder
Public Function AppendFormat (provider As IFormatProvider, format As String, arg0 As Object, arg1 As Object, arg2 As Object) As StringBuilder
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- String
A composite format string.
- arg0
- Object
The first object to format.
- arg1
- Object
The second object to format.
- arg2
- Object
The third object to format.
Returns
A reference to this instance after the append operation has completed. After the append operation, this instance contains any data that existed before the operation, suffixed by a copy of format
where any format specification is replaced by the string representation of the corresponding object argument.
Exceptions
format
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to 3 (three).
The length of the expanded string would exceed MaxCapacity.
Examples
The following example uses the AppendFormat(IFormatProvider, String, Object, Object, Object) method to illustrate the result of a Boolean And
operation with integer values. Note that the format string includes six format items, but the method has only three items in its argument list, because each item is formatted in two different ways.
using System;
using System.Globalization;
using System.Text;
public class Example
{
public static void Main()
{
Random rnd = new Random();
CultureInfo culture = CultureInfo.CreateSpecificCulture("fr-FR");
StringBuilder sb = new StringBuilder();
string formatString = " {0,12:N0} ({0,8:X8})\n" +
"And {1,12:N0} ({1,8:X8})\n" +
" = {2,12:N0} ({2,8:X8})\n";
for (int ctr = 0; ctr <= 2; ctr++) {
int value1 = rnd.Next();
int value2 = rnd.Next();
sb.AppendFormat(culture, formatString,
value1, value2, value1 & value2).
AppendLine();
}
Console.WriteLine(sb.ToString());
}
}
// The example displays output like the following:
// 1 984 112 195 (76432643)
// And 1 179 778 511 (4651FDCF)
// = 1 178 674 243 (46412443)
//
// 2 034 813 710 (7948CB0E)
// And 569 333 976 (21EF58D8)
// = 558 385 160 (21484808)
//
// 126 717 735 (078D8F27)
// And 1 830 715 973 (6D1E8245)
// = 84 705 797 (050C8205)
open System
open System.Globalization
open System.Text
let rnd = Random()
let culture = CultureInfo.CreateSpecificCulture "fr-FR"
let sb = StringBuilder()
let formatString =
" {0,12:N0} ({0,8:X8})\nAnd {1,12:N0} ({1,8:X8})\n = {2,12:N0} ({2,8:X8})\n"
for _ = 0 to 2 do
let value1 = rnd.Next()
let value2 = rnd.Next()
sb
.AppendFormat(culture, formatString, value1, value2, value1 &&& value2)
.AppendLine()
|> ignore
printfn $"{sb}"
// The example displays output like the following:
// 1 984 112 195 (76432643)
// And 1 179 778 511 (4651FDCF)
// = 1 178 674 243 (46412443)
//
// 2 034 813 710 (7948CB0E)
// And 569 333 976 (21EF58D8)
// = 558 385 160 (21484808)
//
// 126 717 735 (078D8F27)
// And 1 830 715 973 (6D1E8245)
// = 84 705 797 (050C8205)
Imports System.Globalization
Imports System.Text
Public Module Example
Public Sub Main()
Dim rnd As New Random()
Dim culture As CultureInfo = CultureInfo.CreateSpecificCulture("fr-FR")
Dim sb As New StringBuilder()
Dim formatString As String = " {0,12:N0} ({0,8:X8})" + vbCrLf +
"And {1,12:N0} ({1,8:X8})" + vbCrLf +
" = {2,12:N0} ({2,8:X8})" + vbCrLf
For ctr As Integer = 0 To 2
Dim value1 As Integer = rnd.Next()
Dim value2 As Integer = rnd.Next()
sb.AppendFormat(culture, formatString,
value1, value2, value1 And value2).AppendLine()
Next
Console.WriteLine(sb.ToString())
End Sub
End Module
' The example displays the following output:
' 1 984 112 195 (76432643)
' And 1 179 778 511 (4651FDCF)
' = 1 178 674 243 (46412443)
'
' 2 034 813 710 (7948CB0E)
' And 569 333 976 (21EF58D8)
' = 558 385 160 (21484808)
'
' 126 717 735 (078D8F27)
' And 1 830 715 973 (6D1E8245)
' = 84 705 797 (050C8205)
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items, that correspond to objects in the parameter list of this method. The formatting process replaces each format item with the string representation of the corresponding object.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. If there is no parameter in the index position, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
The provider
parameter specifies an IFormatProvider implementation that can provide formatting information for arg0
and arg1
. provider
can be any of the following:
A CultureInfo object that provides culture-specific formatting information.
A NumberFormatInfo object that provides culture-specific formatting information for
arg0
orarg1
if they are numeric values.A DateTimeFormatInfo object that provides culture-specific formatting information for
arg0
,arg1
, orarg2
if they are date and time values.A custom IFormatProvider implementation that provides formatting information for
arg0
,arg1
, andarg2
. Typically, such an implementation also implements the ICustomFormatter interface.
If the provider
parameter is null
, format provider information is obtained from the current culture.
arg0
, arg1
, and arg2
represent the objects to be formatted. Each format item in format
is replaced with the string representation of the object that has the corresponding index. If the format item includes formatString
and the corresponding argument implements the IFormattable interface, then the argument's ToString(formatString, provider)
method defines the formatting. Otherwise, the argument's ToString()
method defines the formatting.
Notes to Callers
In .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- How to: Define and Use Custom Numeric Format Providers
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(IFormatProvider, CompositeFormat, Object[])
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider.
public:
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::Text::CompositeFormat ^ format, ... cli::array <System::Object ^> ^ args);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, System.Text.CompositeFormat format, params object?[] args);
member this.AppendFormat : IFormatProvider * System.Text.CompositeFormat * obj[] -> System.Text.StringBuilder
Public Function AppendFormat (provider As IFormatProvider, format As CompositeFormat, ParamArray args As Object()) As StringBuilder
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- CompositeFormat
- args
- Object[]
An array of objects to format.
Returns
A reference to this instance after the append operation has completed.
Exceptions
format
or args
is null
.
The index of a format item is greater than or equal to the number of supplied arguments.
Applies to
AppendFormat(String, ReadOnlySpan<Object>)
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter span.
public:
System::Text::StringBuilder ^ AppendFormat(System::String ^ format, ReadOnlySpan<System::Object ^> args);
public System.Text.StringBuilder AppendFormat (string format, scoped ReadOnlySpan<object?> args);
member this.AppendFormat : string * ReadOnlySpan<obj> -> System.Text.StringBuilder
Public Function AppendFormat (format As String, args As ReadOnlySpan(Of Object)) As StringBuilder
Parameters
- format
- String
A composite format string.
- args
- ReadOnlySpan<Object>
A span of objects to format.
Returns
A reference to this instance after the append operation has completed.
Exceptions
format
is null
.
The length of the expanded string would exceed MaxCapacity.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to the length of the args
span.
Applies to
AppendFormat(IFormatProvider, String, Object[])
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter array using a specified format provider.
public:
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::String ^ format, ... cli::array <System::Object ^> ^ args);
public System.Text.StringBuilder AppendFormat (IFormatProvider provider, string format, params object[] args);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, string format, params object?[] args);
member this.AppendFormat : IFormatProvider * string * obj[] -> System.Text.StringBuilder
Public Function AppendFormat (provider As IFormatProvider, format As String, ParamArray args As Object()) As StringBuilder
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- String
A composite format string.
- args
- Object[]
An array of objects to format.
Returns
A reference to this instance after the append operation has completed. After the append operation, this instance contains any data that existed before the operation, suffixed by a copy of format
where any format specification is replaced by the string representation of the corresponding object argument.
Exceptions
format
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to the length of the args
array.
The length of the expanded string would exceed MaxCapacity.
Examples
The following example demonstrates the AppendFormat method.
using namespace System;
using namespace System::Text;
using namespace System::Globalization;
void Show( StringBuilder^ sbs )
{
Console::WriteLine( sbs );
sbs->Length = 0;
}
int main()
{
StringBuilder^ sb = gcnew StringBuilder;
int var1 = 111;
float var2 = 2.22F;
String^ var3 = "abcd";
array<Object^>^var4 = {3,4.4,(Char)'X'};
Console::WriteLine();
Console::WriteLine( "StringBuilder.AppendFormat method:" );
sb->AppendFormat( "1) {0}", var1 );
Show( sb );
sb->AppendFormat( "2) {0}, {1}", var1, var2 );
Show( sb );
sb->AppendFormat( "3) {0}, {1}, {2}", var1, var2, var3 );
Show( sb );
sb->AppendFormat( "4) {0}, {1}, {2}", var4 );
Show( sb );
CultureInfo^ ci = gcnew CultureInfo( "es-ES",true );
array<Object^>^temp1 = {var2};
sb->AppendFormat( ci, "5) {0}", temp1 );
Show( sb );
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
using System;
using System.Text;
using System.Globalization;
class Sample
{
static StringBuilder sb = new StringBuilder();
public static void Main()
{
int var1 = 111;
float var2 = 2.22F;
string var3 = "abcd";
object[] var4 = {3, 4.4, 'X'};
Console.WriteLine();
Console.WriteLine("StringBuilder.AppendFormat method:");
sb.AppendFormat("1) {0}", var1);
Show(sb);
sb.AppendFormat("2) {0}, {1}", var1, var2);
Show(sb);
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3);
Show(sb);
sb.AppendFormat("4) {0}, {1}, {2}", var4);
Show(sb);
CultureInfo ci = new CultureInfo("es-ES", true);
sb.AppendFormat(ci, "5) {0}", var2);
Show(sb);
}
public static void Show(StringBuilder sbs)
{
Console.WriteLine(sbs.ToString());
sb.Length = 0;
}
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
open System.Text
open System.Globalization
let sb = StringBuilder()
let show (sbs: StringBuilder) =
printfn $"{sbs}"
sb.Length <- 0
let var1 = 111
let var2 = 2.22f
let var3 = "abcd"
let var4: obj[] = [| 3; 4.4; 'X' |]
printfn "StringBuilder.AppendFormat method:"
sb.AppendFormat("1) {0}", var1) |> ignore
show sb
sb.AppendFormat("2) {0}, {1}", var1, var2) |> ignore
show sb
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3) |> ignore
show sb
sb.AppendFormat("4) {0}, {1}, {2}", var4) |> ignore
show sb
let ci = CultureInfo("es-ES", true)
sb.AppendFormat(ci, "5) {0}", var2) |> ignore
show sb
// This example produces the following results:
// StringBuilder.AppendFormat method:
// 1) 111
// 2) 111, 2.22
// 3) 111, 2.22, abcd
// 4) 3, 4.4, X
// 5) 2,22
Imports System.Text
Imports System.Globalization
Class Sample
Private Shared sb As New StringBuilder()
Public Shared Sub Main()
Dim var1 As Integer = 111
Dim var2 As Single = 2.22F
Dim var3 As String = "abcd"
Dim var4 As Object() = {3, 4.4, "X"c}
Console.WriteLine()
Console.WriteLine("StringBuilder.AppendFormat method:")
sb.AppendFormat("1) {0}", var1)
Show(sb)
sb.AppendFormat("2) {0}, {1}", var1, var2)
Show(sb)
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3)
Show(sb)
sb.AppendFormat("4) {0}, {1}, {2}", var4)
Show(sb)
Dim ci As New CultureInfo("es-ES", True)
sb.AppendFormat(ci, "5) {0}", var2)
Show(sb)
End Sub
Public Shared Sub Show(sbs As StringBuilder)
Console.WriteLine(sbs.ToString())
sb.Length = 0
End Sub
End Class
'
'This example produces the following results:
'
'StringBuilder.AppendFormat method:
'1) 111
'2) 111, 2.22
'3) 111, 2.22, abcd
'4) 3, 4.4, X
'5) 2,22
The following example defines a custom IFormatProvider implementation named CustomerFormatter
that formats a 10-digit customer number with hyphens after the fourth and seventh digits. It is passed to the StringBuilder.AppendFormat(IFormatProvider, String, Object[]) method to create a string that includes the formatted customer number and customer name.
using System;
using System.Text;
public class Customer
{
private string custName;
private int custNumber;
public Customer(string name, int number)
{
this.custName = name;
this.custNumber = number;
}
public string Name
{
get { return this.custName; }
}
public int CustomerNumber
{
get { return this.custNumber; }
}
}
public class CustomerNumberFormatter : IFormatProvider, ICustomFormatter
{
public object GetFormat(Type formatType)
{
if (formatType == typeof(ICustomFormatter))
return this;
return null;
}
public string Format(string format, object arg, IFormatProvider provider)
{
if (arg is Int32)
{
string custNumber = ((int) arg).ToString("D10");
return custNumber.Substring(0, 4) + "-" + custNumber.Substring(4, 3) +
"-" + custNumber.Substring(7, 3);
}
else
{
return null;
}
}
}
public class Example
{
public static void Main()
{
Customer customer = new Customer("A Plus Software", 903654);
StringBuilder sb = new StringBuilder();
sb.AppendFormat(new CustomerNumberFormatter(), "{0}: {1}",
customer.CustomerNumber, customer.Name);
Console.WriteLine(sb.ToString());
}
}
// The example displays the following output:
// 0000-903-654: A Plus Software
open System
open System.Text
type Customer(name: string, number: int) =
member _.Name = name
member _.CustomerNumber = number
type CustomerNumberFormatter() =
interface IFormatProvider with
member this.GetFormat(formatType) =
if formatType = typeof<ICustomFormatter> then this else null
interface ICustomFormatter with
member _.Format(_, arg, _) =
match arg with
| :? int as i ->
let custNumber = i.ToString "D10"
$"{custNumber.Substring(0, 4)}-{custNumber.Substring(4, 3)}-{custNumber.Substring(7, 3)}"
| _ -> null
let customer = Customer("A Plus Software", 903654)
let sb = StringBuilder()
sb.AppendFormat(CustomerNumberFormatter(), "{0}: {1}", customer.CustomerNumber, customer.Name)
|> ignore
printfn $"{sb}"
// The example displays the following output:
// 0000-903-654: A Plus Software
Imports System.Text
Public Class Customer
Private custName As String
Private custNumber As Integer
Public Sub New(name As String, number As Integer)
custName = name
custNumber = number
End Sub
Public ReadOnly Property Name As String
Get
Return Me.custName
End Get
End Property
Public ReadOnly Property CustomerNumber As Integer
Get
Return Me.custNumber
End Get
End Property
End Class
Public Class CustomerNumberFormatter
Implements IFormatProvider, ICustomFormatter
Public Function GetFormat(formatType As Type) As Object _
Implements IFormatProvider.GetFormat
If formatType Is GetType(ICustomFormatter) Then
Return Me
End If
Return Nothing
End Function
Public Function Format(fmt As String, arg As Object, provider As IFormatProvider) As String _
Implements ICustomFormatter.Format
If typeof arg Is Int32 Then
Dim custNumber As String = CInt(arg).ToString("D10")
Return custNumber.Substring(0, 4) + "-" + custNumber.SubString(4, 3) + _
"-" + custNumber.Substring(7, 3)
Else
Return Nothing
End If
End Function
End Class
Module Example
Public Sub Main()
Dim customer As New Customer("A Plus Software", 903654)
Dim sb As New StringBuilder()
sb.AppendFormat(New CustomerNumberFormatter, "{0}: {1}", _
customer.CustomerNumber, customer.Name)
Console.WriteLine(sb.ToString())
End Sub
End Module
' The example displays the following output:
' 0000-903-654: A Plus Software
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items, that correspond to objects in the parameter list of this method. The formatting process replaces each format item with the string representation of the corresponding object.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. If there is no parameter in the index position, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
The provider
parameter specifies an IFormatProvider implementation that can provide formatting information for the objects in args
. provider
can be any of the following:
A CultureInfo object that provides culture-specific formatting information.
A NumberFormatInfo object that provides culture-specific formatting information for numeric values in
args
.A DateTimeFormatInfo object that provides culture-specific formatting information for date and time values in
args
.A custom IFormatProvider implementation that provides formatting information for one or more of the objects in
args
. Typically, such an implementation also implements the ICustomFormatter interface. The second example in the next section illustrates an StringBuilder.AppendFormat(IFormatProvider, String, Object[]) method call with a custom IFormatProvider implementation.
If the provider
parameter is null
, format provider information is obtained from the current culture.
args
represents the objects to be formatted. Each format item in format
is replaced with the string representation of the corresponding object in args
. If the format item includes formatString
and the corresponding object in args
implements the IFormattable interface, then args[index].ToString(formatString, provider)
defines the formatting. Otherwise, args[index].ToString()
defines the formatting.
Notes to Callers
In .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- How to: Define and Use Custom Numeric Format Providers
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(IFormatProvider, String, Object)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a single argument using a specified format provider.
public:
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::String ^ format, System::Object ^ arg0);
public System.Text.StringBuilder AppendFormat (IFormatProvider provider, string format, object arg0);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, string format, object? arg0);
member this.AppendFormat : IFormatProvider * string * obj -> System.Text.StringBuilder
Public Function AppendFormat (provider As IFormatProvider, format As String, arg0 As Object) As StringBuilder
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- String
A composite format string.
- arg0
- Object
The object to format.
Returns
A reference to this instance after the append operation has completed. After the append operation, this instance contains any data that existed before the operation, suffixed by a copy of format
in which any format specification is replaced by the string representation of arg0
.
Exceptions
format
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to one (1).
The length of the expanded string would exceed MaxCapacity.
Examples
The following includes two calls to the AppendFormat(IFormatProvider, String, Object) method. Both use the formatting conventions of the English-United Kingdom (en-GB) culture. The first inserts the string representation of a Decimal value currency in a result string. The second inserts a DateTime value in two places in a result string, the first including only the short date string and the second the short time string.
using System;
using System.Globalization;
using System.Text;
public class Example
{
public static void Main()
{
StringBuilder sb = new StringBuilder();
Decimal value = 16.95m;
CultureInfo enGB = CultureInfo.CreateSpecificCulture("en-GB");
DateTime dateToday = DateTime.Now;
sb.AppendFormat(enGB, "Final Price: {0:C2}", value);
sb.AppendLine();
sb.AppendFormat(enGB, "Date and Time: {0:d} at {0:t}", dateToday);
Console.WriteLine(sb.ToString());
}
}
// The example displays the following output:
// Final Price: £16.95
// Date and Time: 01/10/2014 at 10:22
open System
open System.Globalization
open System.Text
let sb = StringBuilder()
let value = 16.95m
let enGB = CultureInfo.CreateSpecificCulture "en-GB"
let dateToday = DateTime.Now
sb.AppendFormat(enGB, "Final Price: {0:C2}", value) |> ignore
sb.AppendLine() |> ignore
sb.AppendFormat(enGB, "Date and Time: {0:d} at {0:t}", dateToday) |> ignore
printfn $"{sb}"
// The example displays the following output:
// Final Price: £16.95
// Date and Time: 01/10/2014 at 10:22
Imports System.Globalization
Imports System.Text
Module Example
Public Sub Main()
Dim sb As New StringBuilder()
Dim value As Decimal = 16.95d
Dim enGB As CultureInfo = CultureInfo.CreateSpecificCulture("en-GB")
Dim dateToday As DateTime = Date.Now
sb.AppendFormat(enGB, "Final Price: {0:C2}", value)
sb.AppendLine()
sb.AppendFormat(enGB, "Date and Time: {0:d} at {0:t}", dateToday)
Console.WriteLine(sb.ToString())
End Sub
End Module
' The example displays output like the following:
' Final Price: £16.95
' Date and Time: 01/10/2014 at 10:22
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of arg0
to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items. The index of each format item must be zero (0) since this method includes an argument list with a single argument. The formatting process replaces each format item with the string representation of arg0
.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. In this case, since the AppendFormat(IFormatProvider, String, Object) method has a single argument in the argument list, the value of index must always be 0. If it is not, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
The provider
parameter specifies an IFormatProvider implementation that can provide formatting information for the objects in args
. provider
can be any of the following:
A CultureInfo object that provides culture-specific formatting information.
A NumberFormatInfo object that provides culture-specific formatting information for
arg0
if it is a numeric value.A DateTimeFormatInfo object that provides culture-specific formatting information for
arg0
if it is a date and time value.A custom IFormatProvider implementation that provides formatting information for
arg0
. Typically, such an implementation also implements the ICustomFormatter interface.
If the provider
parameter is null
, formatting information is obtained from the current culture.
arg0
represents the object to be formatted. Each format item in format
is replaced with the string representation of arg0
. If the format item includes formatString
and arg0
implements the IFormattable interface, then arg0.ToString(formatString, provider)
defines the formatting. Otherwise, arg0.ToString()
defines the formatting.
Notes to Callers
In .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- How to: Define and Use Custom Numeric Format Providers
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(String, Object[])
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter array.
public:
System::Text::StringBuilder ^ AppendFormat(System::String ^ format, ... cli::array <System::Object ^> ^ args);
public System.Text.StringBuilder AppendFormat (string format, params object[] args);
public System.Text.StringBuilder AppendFormat (string format, params object?[] args);
member this.AppendFormat : string * obj[] -> System.Text.StringBuilder
Public Function AppendFormat (format As String, ParamArray args As Object()) As StringBuilder
Parameters
- format
- String
A composite format string.
- args
- Object[]
An array of objects to format.
Returns
A reference to this instance with format
appended. Each format item in format
is replaced by the string representation of the corresponding object argument.
Exceptions
format
or args
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to the length of the args
array.
The length of the expanded string would exceed MaxCapacity.
Examples
The following example demonstrates the AppendFormat method.
using namespace System;
using namespace System::Text;
using namespace System::Globalization;
void Show( StringBuilder^ sbs )
{
Console::WriteLine( sbs );
sbs->Length = 0;
}
int main()
{
StringBuilder^ sb = gcnew StringBuilder;
int var1 = 111;
float var2 = 2.22F;
String^ var3 = "abcd";
array<Object^>^var4 = {3,4.4,(Char)'X'};
Console::WriteLine();
Console::WriteLine( "StringBuilder.AppendFormat method:" );
sb->AppendFormat( "1) {0}", var1 );
Show( sb );
sb->AppendFormat( "2) {0}, {1}", var1, var2 );
Show( sb );
sb->AppendFormat( "3) {0}, {1}, {2}", var1, var2, var3 );
Show( sb );
sb->AppendFormat( "4) {0}, {1}, {2}", var4 );
Show( sb );
CultureInfo^ ci = gcnew CultureInfo( "es-ES",true );
array<Object^>^temp1 = {var2};
sb->AppendFormat( ci, "5) {0}", temp1 );
Show( sb );
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
using System;
using System.Text;
using System.Globalization;
class Sample
{
static StringBuilder sb = new StringBuilder();
public static void Main()
{
int var1 = 111;
float var2 = 2.22F;
string var3 = "abcd";
object[] var4 = {3, 4.4, 'X'};
Console.WriteLine();
Console.WriteLine("StringBuilder.AppendFormat method:");
sb.AppendFormat("1) {0}", var1);
Show(sb);
sb.AppendFormat("2) {0}, {1}", var1, var2);
Show(sb);
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3);
Show(sb);
sb.AppendFormat("4) {0}, {1}, {2}", var4);
Show(sb);
CultureInfo ci = new CultureInfo("es-ES", true);
sb.AppendFormat(ci, "5) {0}", var2);
Show(sb);
}
public static void Show(StringBuilder sbs)
{
Console.WriteLine(sbs.ToString());
sb.Length = 0;
}
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
open System.Text
open System.Globalization
let sb = StringBuilder()
let show (sbs: StringBuilder) =
printfn $"{sbs}"
sb.Length <- 0
let var1 = 111
let var2 = 2.22f
let var3 = "abcd"
let var4: obj[] = [| 3; 4.4; 'X' |]
printfn "StringBuilder.AppendFormat method:"
sb.AppendFormat("1) {0}", var1) |> ignore
show sb
sb.AppendFormat("2) {0}, {1}", var1, var2) |> ignore
show sb
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3) |> ignore
show sb
sb.AppendFormat("4) {0}, {1}, {2}", var4) |> ignore
show sb
let ci = CultureInfo("es-ES", true)
sb.AppendFormat(ci, "5) {0}", var2) |> ignore
show sb
// This example produces the following results:
// StringBuilder.AppendFormat method:
// 1) 111
// 2) 111, 2.22
// 3) 111, 2.22, abcd
// 4) 3, 4.4, X
// 5) 2,22
Imports System.Text
Imports System.Globalization
Class Sample
Private Shared sb As New StringBuilder()
Public Shared Sub Main()
Dim var1 As Integer = 111
Dim var2 As Single = 2.22F
Dim var3 As String = "abcd"
Dim var4 As Object() = {3, 4.4, "X"c}
Console.WriteLine()
Console.WriteLine("StringBuilder.AppendFormat method:")
sb.AppendFormat("1) {0}", var1)
Show(sb)
sb.AppendFormat("2) {0}, {1}", var1, var2)
Show(sb)
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3)
Show(sb)
sb.AppendFormat("4) {0}, {1}, {2}", var4)
Show(sb)
Dim ci As New CultureInfo("es-ES", True)
sb.AppendFormat(ci, "5) {0}", var2)
Show(sb)
End Sub
Public Shared Sub Show(sbs As StringBuilder)
Console.WriteLine(sbs.ToString())
sb.Length = 0
End Sub
End Class
'
'This example produces the following results:
'
'StringBuilder.AppendFormat method:
'1) 111
'2) 111, 2.22
'3) 111, 2.22, abcd
'4) 3, 4.4, X
'5) 2,22
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items, that correspond to objects in the parameter list of this method. The formatting process replaces each format item with the string representation of the corresponding object.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. If there is no parameter in the index position, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
args
represents the objects to be formatted. Each format item in format
is replaced with the string representation of the corresponding object in args
. If the format item includes formatString
and the corresponding object in args
implements the IFormattable interface, then args[index].ToString(formatString, provider)
defines the formatting. Otherwise, args[index].ToString()
defines the formatting.
If the string assigned to format
is "Thank you for your donation of {0:####} cans of food to our charitable organization." and arg0
is an integer with the value 10, the return value will be "Thank you for your donation of 10 cans of food to our charitable organization."
Notes to Callers
In .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(String, Object)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a single argument.
public:
System::Text::StringBuilder ^ AppendFormat(System::String ^ format, System::Object ^ arg0);
public System.Text.StringBuilder AppendFormat (string format, object arg0);
public System.Text.StringBuilder AppendFormat (string format, object? arg0);
member this.AppendFormat : string * obj -> System.Text.StringBuilder
Public Function AppendFormat (format As String, arg0 As Object) As StringBuilder
Parameters
- format
- String
A composite format string.
- arg0
- Object
An object to format.
Returns
A reference to this instance with format
appended. Each format item in format
is replaced by the string representation of arg0
.
Exceptions
format
is null
.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to 1.
The length of the expanded string would exceed MaxCapacity.
Examples
The following example demonstrates the AppendFormat method.
using namespace System;
using namespace System::Text;
using namespace System::Globalization;
void Show( StringBuilder^ sbs )
{
Console::WriteLine( sbs );
sbs->Length = 0;
}
int main()
{
StringBuilder^ sb = gcnew StringBuilder;
int var1 = 111;
float var2 = 2.22F;
String^ var3 = "abcd";
array<Object^>^var4 = {3,4.4,(Char)'X'};
Console::WriteLine();
Console::WriteLine( "StringBuilder.AppendFormat method:" );
sb->AppendFormat( "1) {0}", var1 );
Show( sb );
sb->AppendFormat( "2) {0}, {1}", var1, var2 );
Show( sb );
sb->AppendFormat( "3) {0}, {1}, {2}", var1, var2, var3 );
Show( sb );
sb->AppendFormat( "4) {0}, {1}, {2}", var4 );
Show( sb );
CultureInfo^ ci = gcnew CultureInfo( "es-ES",true );
array<Object^>^temp1 = {var2};
sb->AppendFormat( ci, "5) {0}", temp1 );
Show( sb );
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
using System;
using System.Text;
using System.Globalization;
class Sample
{
static StringBuilder sb = new StringBuilder();
public static void Main()
{
int var1 = 111;
float var2 = 2.22F;
string var3 = "abcd";
object[] var4 = {3, 4.4, 'X'};
Console.WriteLine();
Console.WriteLine("StringBuilder.AppendFormat method:");
sb.AppendFormat("1) {0}", var1);
Show(sb);
sb.AppendFormat("2) {0}, {1}", var1, var2);
Show(sb);
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3);
Show(sb);
sb.AppendFormat("4) {0}, {1}, {2}", var4);
Show(sb);
CultureInfo ci = new CultureInfo("es-ES", true);
sb.AppendFormat(ci, "5) {0}", var2);
Show(sb);
}
public static void Show(StringBuilder sbs)
{
Console.WriteLine(sbs.ToString());
sb.Length = 0;
}
}
/*
This example produces the following results:
StringBuilder.AppendFormat method:
1) 111
2) 111, 2.22
3) 111, 2.22, abcd
4) 3, 4.4, X
5) 2,22
*/
open System.Text
open System.Globalization
let sb = StringBuilder()
let show (sbs: StringBuilder) =
printfn $"{sbs}"
sb.Length <- 0
let var1 = 111
let var2 = 2.22f
let var3 = "abcd"
let var4: obj[] = [| 3; 4.4; 'X' |]
printfn "StringBuilder.AppendFormat method:"
sb.AppendFormat("1) {0}", var1) |> ignore
show sb
sb.AppendFormat("2) {0}, {1}", var1, var2) |> ignore
show sb
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3) |> ignore
show sb
sb.AppendFormat("4) {0}, {1}, {2}", var4) |> ignore
show sb
let ci = CultureInfo("es-ES", true)
sb.AppendFormat(ci, "5) {0}", var2) |> ignore
show sb
// This example produces the following results:
// StringBuilder.AppendFormat method:
// 1) 111
// 2) 111, 2.22
// 3) 111, 2.22, abcd
// 4) 3, 4.4, X
// 5) 2,22
Imports System.Text
Imports System.Globalization
Class Sample
Private Shared sb As New StringBuilder()
Public Shared Sub Main()
Dim var1 As Integer = 111
Dim var2 As Single = 2.22F
Dim var3 As String = "abcd"
Dim var4 As Object() = {3, 4.4, "X"c}
Console.WriteLine()
Console.WriteLine("StringBuilder.AppendFormat method:")
sb.AppendFormat("1) {0}", var1)
Show(sb)
sb.AppendFormat("2) {0}, {1}", var1, var2)
Show(sb)
sb.AppendFormat("3) {0}, {1}, {2}", var1, var2, var3)
Show(sb)
sb.AppendFormat("4) {0}, {1}, {2}", var4)
Show(sb)
Dim ci As New CultureInfo("es-ES", True)
sb.AppendFormat(ci, "5) {0}", var2)
Show(sb)
End Sub
Public Shared Sub Show(sbs As StringBuilder)
Console.WriteLine(sbs.ToString())
sb.Length = 0
End Sub
End Class
'
'This example produces the following results:
'
'StringBuilder.AppendFormat method:
'1) 111
'2) 111, 2.22
'3) 111, 2.22, abcd
'4) 3, 4.4, X
'5) 2,22
Remarks
This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in the current StringBuilder object.
The format
parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items. The index of the format items must be 0, to correspond to arg0
, the single object in the parameter list of this method. The formatting process replaces each format item with the string representation of arg0
.
The syntax of a format item is as follows:
{index[,length][:formatString]}
Elements in square brackets are optional. The following table describes each element.
Element | Description |
---|---|
index | The zero-based position in the parameter list of the object to be formatted. If the object specified by index is null , the format item is replaced by String.Empty. If there is no parameter in the index position, a FormatException is thrown. |
,length | The minimum number of characters in the string representation of the parameter. If positive, the parameter is right-aligned; if negative, it is left-aligned. |
:formatString | A standard or custom format string that is supported by the parameter. |
Note
For the standard and custom format strings used with date and time values, see Standard Date and Time Format Strings and Custom Date and Time Format Strings. For the standard and custom format strings used with numeric values, see Standard Numeric Format Strings and Custom Numeric Format Strings. For the standard format strings used with enumerations, see Enumeration Format Strings.
arg0
represents the object to be formatted. Each format item in format
is replaced with the string representation of arg0
. If the format item includes formatString
and arg0
implements the IFormattable interface, then arg0.ToString(formatString, null)
defines the formatting. Otherwise, arg0.ToString()
defines the formatting.
If the string assigned to format
is "Thank you for your donation of {0:####} cans of food to our charitable organization." and arg0
is an integer with the value 10, the return value will be "Thank you for your donation of 10 cans of food to our charitable organization."
Notes to Callers
In .NET Core and in the .NET Framework 4.0 and later versions, when you instantiate the StringBuilder object by calling the StringBuilder(Int32, Int32) constructor, both the length and the capacity of the StringBuilder instance can grow beyond the value of its MaxCapacity property. This can occur particularly when you call the Append(String) and AppendFormat(String, Object) methods to append small strings.
See also
- Formatting Types in .NET
- Composite Formatting
- Standard Numeric Format Strings
- Custom Numeric Format Strings
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Standard TimeSpan Format Strings
- Custom TimeSpan Format Strings
- Enumeration Format Strings
Applies to
AppendFormat(IFormatProvider, String, ReadOnlySpan<Object>)
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of a corresponding argument in a parameter span using a specified format provider.
public:
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::String ^ format, ReadOnlySpan<System::Object ^> args);
public System.Text.StringBuilder AppendFormat (IFormatProvider? provider, string format, scoped ReadOnlySpan<object?> args);
member this.AppendFormat : IFormatProvider * string * ReadOnlySpan<obj> -> System.Text.StringBuilder
Public Function AppendFormat (provider As IFormatProvider, format As String, args As ReadOnlySpan(Of Object)) As StringBuilder
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- String
A composite format string.
- args
- ReadOnlySpan<Object>
A span of objects to format.
Returns
A reference to this instance after the append operation has completed.
Exceptions
format
is null
.
The length of the expanded string would exceed MaxCapacity.
format
is invalid.
-or-
The index of a format item is less than 0 (zero), or greater than or equal to the length of the args
span.
Applies to
AppendFormat<TArg0,TArg1,TArg2>(IFormatProvider, CompositeFormat, TArg0, TArg1, TArg2)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider.
public:
generic <typename TArg0, typename TArg1, typename TArg2>
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::Text::CompositeFormat ^ format, TArg0 arg0, TArg1 arg1, TArg2 arg2);
public System.Text.StringBuilder AppendFormat<TArg0,TArg1,TArg2> (IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0, TArg1 arg1, TArg2 arg2);
member this.AppendFormat : IFormatProvider * System.Text.CompositeFormat * 'TArg0 * 'TArg1 * 'TArg2 -> System.Text.StringBuilder
Public Function AppendFormat(Of TArg0, TArg1, TArg2) (provider As IFormatProvider, format As CompositeFormat, arg0 As TArg0, arg1 As TArg1, arg2 As TArg2) As StringBuilder
Type Parameters
- TArg0
The type of the first object to format.
- TArg1
The type of the second object to format.
- TArg2
The type of the third object to format.
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- CompositeFormat
- arg0
- TArg0
The first object to format.
- arg1
- TArg1
The second object to format.
- arg2
- TArg2
The third object to format.
Returns
A reference to this instance after the append operation has completed.
Exceptions
format
is null
.
The index of a format item is greater than or equal to the number of supplied arguments.
Applies to
AppendFormat<TArg0,TArg1>(IFormatProvider, CompositeFormat, TArg0, TArg1)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider.
public:
generic <typename TArg0, typename TArg1>
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::Text::CompositeFormat ^ format, TArg0 arg0, TArg1 arg1);
public System.Text.StringBuilder AppendFormat<TArg0,TArg1> (IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0, TArg1 arg1);
member this.AppendFormat : IFormatProvider * System.Text.CompositeFormat * 'TArg0 * 'TArg1 -> System.Text.StringBuilder
Public Function AppendFormat(Of TArg0, TArg1) (provider As IFormatProvider, format As CompositeFormat, arg0 As TArg0, arg1 As TArg1) As StringBuilder
Type Parameters
- TArg0
The type of the first object to format.
- TArg1
The type of the second object to format.
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- CompositeFormat
- arg0
- TArg0
The first object to format.
- arg1
- TArg1
The second object to format.
Returns
A reference to this instance after the append operation has completed.
Exceptions
format
is null
.
The index of a format item is greater than or equal to the number of supplied arguments.
Applies to
AppendFormat<TArg0>(IFormatProvider, CompositeFormat, TArg0)
- Source:
- StringBuilder.cs
- Source:
- StringBuilder.cs
Appends the string returned by processing a composite format string, which contains zero or more format items, to this instance. Each format item is replaced by the string representation of any of the arguments using a specified format provider.
public:
generic <typename TArg0>
System::Text::StringBuilder ^ AppendFormat(IFormatProvider ^ provider, System::Text::CompositeFormat ^ format, TArg0 arg0);
public System.Text.StringBuilder AppendFormat<TArg0> (IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0);
member this.AppendFormat : IFormatProvider * System.Text.CompositeFormat * 'TArg0 -> System.Text.StringBuilder
Public Function AppendFormat(Of TArg0) (provider As IFormatProvider, format As CompositeFormat, arg0 As TArg0) As StringBuilder
Type Parameters
- TArg0
The type of the first object to format.
Parameters
- provider
- IFormatProvider
An object that supplies culture-specific formatting information.
- format
- CompositeFormat
- arg0
- TArg0
The first object to format.
Returns
A reference to this instance after the append operation has completed.
Exceptions
format
is null
.
The index of a format item is greater than or equal to the number of supplied arguments.
Applies to
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