Convert.ToDecimal Method

Reference

Definition

Namespace:: System

Assembly:: System.Runtime.Extensions.dll

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

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.

Converts a specified value to a decimal number.

Overloads

ToDecimal(Single)	Converts the value of the specified single-precision floating-point number to the equivalent decimal number.
ToDecimal(String)	Converts the specified string representation of a number to an equivalent decimal number.
ToDecimal(UInt16)	Converts the value of the specified 16-bit unsigned integer to an equivalent decimal number.
ToDecimal(String, IFormatProvider)	Converts the specified string representation of a number to an equivalent decimal number, using the specified culture-specific formatting information.
ToDecimal(UInt64)	Converts the value of the specified 64-bit unsigned integer to an equivalent decimal number.
ToDecimal(Object, IFormatProvider)	Converts the value of the specified object to an equivalent decimal number, using the specified culture-specific formatting information.
ToDecimal(SByte)	Converts the value of the specified 8-bit signed integer to the equivalent decimal number.
ToDecimal(UInt32)	Converts the value of the specified 32-bit unsigned integer to an equivalent decimal number.
ToDecimal(Object)	Converts the value of the specified object to an equivalent decimal number.
ToDecimal(Int64)	Converts the value of the specified 64-bit signed integer to an equivalent decimal number.
ToDecimal(Int32)	Converts the value of the specified 32-bit signed integer to an equivalent decimal number.
ToDecimal(Int16)	Converts the value of the specified 16-bit signed integer to an equivalent decimal number.
ToDecimal(Double)	Converts the value of the specified double-precision floating-point number to an equivalent decimal number.
ToDecimal(Decimal)	Returns the specified decimal number; no actual conversion is performed.
ToDecimal(DateTime)	Calling this method always throws InvalidCastException.
ToDecimal(Char)	Calling this method always throws InvalidCastException.
ToDecimal(Byte)	Converts the value of the specified 8-bit unsigned integer to the equivalent decimal number.
ToDecimal(Boolean)	Converts the specified Boolean value to the equivalent decimal number.

ToDecimal(Single)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified single-precision floating-point number to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(float value);

public static decimal ToDecimal (float value);

static member ToDecimal : single -> decimal

Public Shared Function ToDecimal (value As Single) As Decimal

Parameters

value: Single

The single-precision floating-point number to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Exceptions

OverflowException

value is greater than Decimal.MaxValue or less than Decimal.MinValue.

Examples

The following example tries to convert each element in an array of Single values to a Decimal value.

float[] numbers = { Single.MinValue, -3e10f, -1093.54f, 0f, 1e-03f,
                    1034.23f, Single.MaxValue };
decimal result;

foreach (float number in numbers)
{
   try {
      result = Convert.ToDecimal(number);
      Console.WriteLine("Converted the Single value {0} to {1}.", number, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is out of range of the Decimal type.", number);
   }
}
// The example displays the following output:
//       -3.402823E+38 is out of range of the Decimal type.
//       Converted the Single value -3E+10 to -30000000000.
//       Converted the Single value -1093.54 to -1093.54.
//       Converted the Single value 0 to 0.
//       Converted the Single value 0.001 to 0.001.
//       Converted the Single value 1034.23 to 1034.23.
//       3.402823E+38 is out of range of the Decimal type.

let numbers =
    [| Single.MinValue; -3e10f; -1093.54f; 0f
       1e-03f; 1034.23f; Single.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToDecimal number
        printfn $"Converted the Single value {number} to {result}."
    with :? OverflowException ->
        printfn $"{number} is out of range of the Decimal type."
// The example displays the following output:
//       -3.402823E+38 is out of range of the Decimal type.
//       Converted the Single value -3E+10 to -30000000000.
//       Converted the Single value -1093.54 to -1093.54.
//       Converted the Single value 0 to 0.
//       Converted the Single value 0.001 to 0.001.
//       Converted the Single value 1034.23 to 1034.23.
//       3.402823E+38 is out of range of the Decimal type.

Dim numbers() As Single = { Single.MinValue, -3e10, -1093.54, 0, 1e-03, _
                            1034.23, Single.MaxValue }
Dim result As Decimal

For Each number As Single In numbers
   Try
      result = Convert.ToDecimal(number)
      Console.WriteLine("Converted the Single value {0} to {1}.", number, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is out of range of the Decimal type.", number)
   End Try
Next                                  
' The example displays the following output:
'       -3.402823E+38 is out of range of the Decimal type.
'       Converted the Single value -3E+10 to -30000000000.
'       Converted the Single value -1093.54 to -1093.54.
'       Converted the Single value 0 to 0.
'       Converted the Single value 0.001 to 0.001.
'       Converted the Single value 1034.23 to 1034.23.
'       3.402823E+38 is out of range of the Decimal type.

Remarks

The Decimal value returned by this method contains a maximum of seven significant digits. If the value parameter contains more than seven significant digits, it is rounded using rounding to nearest. The following example illustrates how the ToDecimal(Single) method uses rounding to nearest to return a Decimal value with seven significant digits.

Console.WriteLine(Convert.ToDecimal(1234567500.12F));  // Displays 1234568000
Console.WriteLine(Convert.ToDecimal(1234568500.12F));  // Displays 1234568000

Console.WriteLine(Convert.ToDecimal(10.980365F));      // Displays 10.98036
Console.WriteLine(Convert.ToDecimal(10.980355F));      // Displays 10.98036

printfn $"{Convert.ToDecimal 1234567500.12F}"  // Displays 1234568000
printfn $"{Convert.ToDecimal 1234568500.12F}"  // Displays 1234568000

printfn $"{Convert.ToDecimal 10.980365F}"      // Displays 10.98036
printfn $"{Convert.ToDecimal 10.980355F}"      // Displays 10.98036

Console.WriteLine(Convert.ToDecimal(1234567500.12f))   ' Displays 1234568000
Console.WriteLine(Convert.ToDecimal(1234568500.12f))   ' Displays 1234568000

Console.WriteLine(Convert.ToDecimal(10.980365f))       ' Displays 10.98036 
Console.WriteLine(Convert.ToDecimal(10.980355f))       ' Displays 10.98036

Applies to

ToDecimal(String)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the specified string representation of a number to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::String ^ value);

public static decimal ToDecimal (string value);

public static decimal ToDecimal (string? value);

static member ToDecimal : string -> decimal

Public Shared Function ToDecimal (value As String) As Decimal

Parameters

value: String

A string that contains a number to convert.

Returns

Decimal

A decimal number that is equivalent to the number in value, or 0 (zero) if value is null.

Exceptions

FormatException

value is not a number in a valid format.

OverflowException

value represents a number that is less than Decimal.MinValue or greater than Decimal.MaxValue.

Examples

The following example illustrates the use of ToDecimal. It attempts to convert a String to a Decimal, and throws the possible exceptions that may arise during the conversion.

public:
   void ConvertStringDecimal( String^ stringVal )
   {
      Decimal decimalVal = 0;

      try
      {
         decimalVal = System::Convert::ToDecimal( stringVal );
         System::Console::WriteLine( "The String as a decimal is {0}.",
         decimalVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine(
            "The conversion from String to decimal overflowed." );
      }
      catch ( System::FormatException^ ) 
      {
         System::Console::WriteLine(
            "The String is not formatted as a decimal." );
      }
      catch ( System::ArgumentNullException^ ) 
      {
         System::Console::WriteLine( "The String is 0." );
      }
      
      // Decimal to String conversion will not overflow.
      stringVal = System::Convert::ToString( decimalVal );
      System::Console::WriteLine(
         "The decimal as a String is {0}.", stringVal );
   }

public void ConvertStringDecimal(string stringVal) {
    decimal decimalVal = 0;
    
    try {
        decimalVal = System.Convert.ToDecimal(stringVal);
        System.Console.WriteLine(
            "The string as a decimal is {0}.", decimalVal);
    }
    catch (System.OverflowException){
        System.Console.WriteLine(
            "The conversion from string to decimal overflowed.");
    }
    catch (System.FormatException) {
        System.Console.WriteLine(
            "The string is not formatted as a decimal.");
    }
    catch (System.ArgumentNullException) {
        System.Console.WriteLine(
            "The string is null.");
    }

    // Decimal to string conversion will not overflow.
    stringVal = System.Convert.ToString(decimalVal);
    System.Console.WriteLine(
        "The decimal as a string is {0}.", stringVal);
}

let convertStringDecimal (stringVal: string) =
    let decimalVal = 0m

    try
        let decimalVal = Convert.ToDecimal(stringVal)
        printfn $"The string as a decimal is {decimalVal}."
    with
    | :? OverflowException ->
        printfn "The conversion from string to decimal overflowed."
    | :? FormatException ->
        printfn "The string is not formatted as a decimal."
    | :? ArgumentNullException ->
        printfn "The string is null."

    // Decimal to string conversion will not overflow.
    let stringVal = Convert.ToString decimalVal
    printfn $"The decimal as a string is {stringVal}."

Public Sub ConvertStringDecimal(ByVal stringVal As String)
    Dim decimalVal As Decimal = 0

    Try
        decimalVal = System.Convert.ToDecimal(stringVal)
        System.Console.WriteLine("The string as a decimal is {0}.", _
                                  decimalVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in string-to-decimal conversion.")
    Catch exception As System.FormatException
        System.Console.WriteLine( _
            "The string is not formatted as a decimal.")
    Catch exception As System.ArgumentException
        System.Console.WriteLine("The string is null.")
    End Try

    ' Decimal to string conversion will not overflow.
    stringVal = System.Convert.ToString(decimalVal)
    System.Console.WriteLine("The decimal as a string is {0}.", _
                              stringVal)
End Sub

Remarks

Using the ToDecimal(String) method is equivalent to passing value to the Decimal.Parse(String) method. value is interpreted by using the formatting conventions of the current culture.

If you prefer not to handle an exception if the conversion fails, you can call the Decimal.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

Applies to

ToDecimal(UInt16)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 16-bit unsigned integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::UInt16 value);

[System.CLSCompliant(false)]
public static decimal ToDecimal (ushort value);

[<System.CLSCompliant(false)>]
static member ToDecimal : uint16 -> decimal

Public Shared Function ToDecimal (value As UShort) As Decimal

Parameters

value: UInt16

The 16-bit unsigned integer to convert.

Returns

Decimal

The decimal number that is equivalent to value.

Attributes: CLSCompliantAttribute

Examples

The following example converts an array of 16-bit unsigned integers to Decimal values.

ushort[] numbers = { UInt16.MinValue, 121, 12345, UInt16.MaxValue };
decimal result;

foreach (ushort number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the UInt16 value {0} to {1}.",
                     number, result);
}
// The example displays the following output:
//       Converted the UInt16 value 0 to 0.
//       Converted the UInt16 value 121 to 121.
//       Converted the UInt16 value 12345 to 12345.
//       Converted the UInt16 value 65535 to 65535.

let numbers = 
    [| UInt16.MinValue; 121us; 12345us; UInt16.MaxValue |]

for number in numbers do
    let result = Convert.ToDecimal number
    printfn $"Converted the UInt16 value {number} to {result}."
// The example displays the following output:
//       Converted the UInt16 value 0 to 0.
//       Converted the UInt16 value 121 to 121.
//       Converted the UInt16 value 12345 to 12345.
//       Converted the UInt16 value 65535 to 65535.

Dim numbers() As UShort = { UInt16.MinValue, 121, 12345, UInt16.MaxValue }
Dim result As Decimal

For Each number As UShort In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the UInt16 value {0} to {1}.", _
                     number, result)
Next   
' The example displays the following output:
'       Converted the UInt16 value 0 to 0.
'       Converted the UInt16 value 121 to 121.
'       Converted the UInt16 value 12345 to 12345.
'       Converted the UInt16 value 65535 to 65535.

Applies to

ToDecimal(String, IFormatProvider)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the specified string representation of a number to an equivalent decimal number, using the specified culture-specific formatting information.

public:
 static System::Decimal ToDecimal(System::String ^ value, IFormatProvider ^ provider);

public static decimal ToDecimal (string value, IFormatProvider provider);

public static decimal ToDecimal (string? value, IFormatProvider? provider);

static member ToDecimal : string * IFormatProvider -> decimal

Public Shared Function ToDecimal (value As String, provider As IFormatProvider) As Decimal

Parameters

value: String

A string that contains a number to convert.

provider: IFormatProvider

An object that supplies culture-specific formatting information.

Returns

Decimal

A decimal number that is equivalent to the number in value, or 0 (zero) if value is null.

Exceptions

FormatException

value is not a number in a valid format.

OverflowException

value represents a number that is less than Decimal.MinValue or greater than Decimal.MaxValue.

Examples

The following example attempts to convert an array of strings to Decimal values by using NumberFormatInfo objects that represent two different cultures.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string[] values = { "123456789", "12345.6789", "12 345,6789",
                          "123,456.789", "123 456,789", "123,456,789.0123",
                          "123 456 789,0123" };
      CultureInfo[] cultures = { new CultureInfo("en-US"),
                                 new CultureInfo("fr-FR") };

      foreach (CultureInfo culture in cultures)
      {
         Console.WriteLine("String -> Decimal Conversion Using the {0} Culture",
                           culture.Name);
         foreach (string value in values)
         {
            Console.Write("{0,20}  ->  ", value);
            try {
               Console.WriteLine(Convert.ToDecimal(value, culture));
            }
            catch (FormatException) {
               Console.WriteLine("FormatException");
            }
         }
         Console.WriteLine();
      }
   }
}
// The example displays the following output:
//       String -> Decimal Conversion Using the en-US Culture
//                  123456789  ->  123456789
//                 12345.6789  ->  12345.6789
//                12 345,6789  ->  FormatException
//                123,456.789  ->  123456.789
//                123 456,789  ->  FormatException
//           123,456,789.0123  ->  123456789.0123
//           123 456 789,0123  ->  FormatException
//
//       String -> Decimal Conversion Using the fr-FR Culture
//                  123456789  ->  123456789
//                 12345.6789  ->  FormatException
//                12 345,6789  ->  12345.6789
//                123,456.789  ->  FormatException
//                123 456,789  ->  123456.789
//           123,456,789.0123  ->  FormatException
//           123 456 789,0123  ->  123456789.0123

open System
open System.Globalization

let values = 
    [| "123456789"; "12345.6789"; "12 345,6789"; "123,456.789"
       "123 456,789"; "123,456,789.0123"; "123 456 789,0123" |]
let cultures = 
    [ CultureInfo "en-US"; CultureInfo "fr-FR" ]

for culture in cultures do
    printfn $"String -> Decimal Conversion Using the {culture.Name} Culture"
    for value in values do
        printf $"{value,20}  ->  "
        try
            printfn $"{Convert.ToDecimal(value, culture)}"
        with :? FormatException ->
            printfn "FormatException"
    printfn ""
// The example displays the following output:
//       String -> Decimal Conversion Using the en-US Culture
//                  123456789  ->  123456789
//                 12345.6789  ->  12345.6789
//                12 345,6789  ->  FormatException
//                123,456.789  ->  123456.789
//                123 456,789  ->  FormatException
//           123,456,789.0123  ->  123456789.0123
//           123 456 789,0123  ->  FormatException
//
//       String -> Decimal Conversion Using the fr-FR Culture
//                  123456789  ->  123456789
//                 12345.6789  ->  FormatException
//                12 345,6789  ->  12345.6789
//                123,456.789  ->  FormatException
//                123 456,789  ->  123456.789
//           123,456,789.0123  ->  FormatException
//           123 456 789,0123  ->  123456789.0123

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim values() As String = { "123456789", "12345.6789", "12 345,6789", _
                                 "123,456.789", "123 456,789", "123,456,789.0123", _
                                 "123 456 789,0123" }
      Dim cultures() As CultureInfo = { New CultureInfo("en-US"), _
                                        New CultureInfo("fr-FR") } 

      For Each culture As CultureInfo In cultures
         Console.WriteLine("String -> Decimal Conversion Using the {0} Culture", _
                           culture.Name)
         For Each value As String In values
            Console.Write("{0,20}  ->  ", value)
            Try
               Console.WriteLine(Convert.ToDecimal(value, culture))
            Catch e As FormatException
               Console.WriteLine("FormatException")
            End Try   
         Next
         Console.WriteLine()
      Next                     
   End Sub
End Module
' The example displays the following output:
'       String -> Decimal Conversion Using the en-US Culture
'                  123456789  ->  123456789
'                 12345.6789  ->  12345.6789
'                12 345,6789  ->  FormatException
'                123,456.789  ->  123456.789
'                123 456,789  ->  FormatException
'           123,456,789.0123  ->  123456789.0123
'           123 456 789,0123  ->  FormatException
'       
'       String -> Decimal Conversion Using the fr-FR Culture
'                  123456789  ->  123456789
'                 12345.6789  ->  FormatException
'                12 345,6789  ->  12345.6789
'                123,456.789  ->  FormatException
'                123 456,789  ->  123456.789
'           123,456,789.0123  ->  FormatException
'           123 456 789,0123  ->  123456789.0123

Remarks

The return value is the result of invoking the Decimal.Parse method on value.

provider is an IFormatProvider instance that obtains a NumberFormatInfo object. The NumberFormatInfo object provides culture-specific information about the format of value. If provider is null, the NumberFormatInfo for the current culture is used.

Applies to

ToDecimal(UInt64)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 64-bit unsigned integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::UInt64 value);

[System.CLSCompliant(false)]
public static decimal ToDecimal (ulong value);

[<System.CLSCompliant(false)>]
static member ToDecimal : uint64 -> decimal

Public Shared Function ToDecimal (value As ULong) As Decimal

Parameters

value: UInt64

The 64-bit unsigned integer to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Attributes: CLSCompliantAttribute

Examples

The following example converts an array of unsigned long integers to Decimal values.

ulong[] numbers = { UInt64.MinValue, 121, 12345, UInt64.MaxValue };
decimal result;

foreach (ulong number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the UInt64 value {0} to {1}.",
                     number, result);
}
// The example displays the following output:
//    Converted the UInt64 value 0 to 0.
//    Converted the UInt64 value 121 to 121.
//    Converted the UInt64 value 12345 to 12345.
//    Converted the UInt64 value 18446744073709551615 to 18446744073709551615.

let numbers = 
    [| UInt64.MinValue; 121uL; 12345uL; UInt64.MaxValue |]

for number in numbers do
    let result = Convert.ToDecimal number
    printfn $"Converted the UInt64 value {number} to {result}."
// The example displays the following output:
//    Converted the UInt64 value 0 to 0.
//    Converted the UInt64 value 121 to 121.
//    Converted the UInt64 value 12345 to 12345.
//    Converted the UInt64 value 18446744073709551615 to 18446744073709551615.

Dim numbers() As ULong = { UInt64.MinValue, 121, 12345, UInt64.MaxValue }
Dim result As Decimal

For Each number As ULong In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the UInt64 value {0} to {1}.", _
                     number, result)
Next   
' The example displays the following output:
'    Converted the UInt64 value 0 to 0.
'    Converted the UInt64 value 121 to 121.
'    Converted the UInt64 value 12345 to 12345.
'    Converted the UInt64 value 18446744073709551615 to 18446744073709551615.

Applies to

ToDecimal(Object, IFormatProvider)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified object to an equivalent decimal number, using the specified culture-specific formatting information.

public:
 static System::Decimal ToDecimal(System::Object ^ value, IFormatProvider ^ provider);

public static decimal ToDecimal (object value, IFormatProvider provider);

public static decimal ToDecimal (object? value, IFormatProvider? provider);

static member ToDecimal : obj * IFormatProvider -> decimal

Public Shared Function ToDecimal (value As Object, provider As IFormatProvider) As Decimal

Parameters

value: Object

An object that implements the IConvertible interface.

provider: IFormatProvider

An object that supplies culture-specific formatting information.

Returns

Decimal

A decimal number that is equivalent to value, or 0 (zero) if value is null.

Exceptions

FormatException

value is not in an appropriate format for a Decimal type.

InvalidCastException

value does not implement the IConvertible interface.

-or-

The conversion is not supported.

OverflowException

value represents a number that is less than Decimal.MinValue or greater than Decimal.MaxValue.

Examples

The following example defines a Temperature class that implements the IConvertible interface.

using System;
using System.Globalization;

public class Temperature : IConvertible
{
   private decimal m_Temp;

   public Temperature(decimal temperature)
   {
      this.m_Temp = temperature;
   }

   public decimal Celsius
   {
      get { return this.m_Temp; }
   }

   public decimal Kelvin
   {
      get { return this.m_Temp + 273.15m; }
   }

   public decimal Fahrenheit
   {
      get { return Math.Round((decimal) (this.m_Temp * 9 / 5 + 32), 2); }
   }

   public override string ToString()
   {
      return m_Temp.ToString("N2") + " °C";
   }

   // IConvertible implementations.
   public TypeCode GetTypeCode()
   {
      return TypeCode.Object;
   }

   public bool ToBoolean(IFormatProvider provider)
   {
      if (m_Temp == 0)
         return false;
      else
         return true;
   }

   public byte ToByte(IFormatProvider provider)
   {
      if (m_Temp < Byte.MinValue || m_Temp > Byte.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Byte type.",
                                                   this.m_Temp));
      else
         return Decimal.ToByte(this.m_Temp);
   }

   public char ToChar(IFormatProvider provider)
   {
      throw new InvalidCastException("Temperature to Char conversion is not supported.");
   }

   public DateTime ToDateTime(IFormatProvider provider)
   {
      throw new InvalidCastException("Temperature to DateTime conversion is not supported.");
   }

   public decimal ToDecimal(IFormatProvider provider)
   {
      return this.m_Temp;
   }

   public double ToDouble(IFormatProvider provider)
   {
      return Decimal.ToDouble(this.m_Temp);
   }

   public short ToInt16(IFormatProvider provider)
   {
      if (this.m_Temp < Int16.MinValue || this.m_Temp > Int16.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int16 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToInt16(this.m_Temp);
   }

   public int ToInt32(IFormatProvider provider)
      {
      if (this.m_Temp < Int32.MinValue || this.m_Temp > Int32.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int32 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToInt32(this.m_Temp);
   }

   public long ToInt64(IFormatProvider provider)
   {
      if (this.m_Temp < Int64.MinValue || this.m_Temp > Int64.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int64 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToInt64(this.m_Temp);
   }

   public sbyte ToSByte(IFormatProvider provider)
   {
      if (this.m_Temp < SByte.MinValue || this.m_Temp > SByte.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the SByte type.",
                                                   this.m_Temp));
      else
         return Decimal.ToSByte(this.m_Temp);
   }

   public float ToSingle(IFormatProvider provider)
   {
      return Decimal.ToSingle(this.m_Temp);
   }

   public string ToString(IFormatProvider provider)
   {
      return m_Temp.ToString("N2", provider) + " °C";
   }

   public object ToType(Type conversionType, IFormatProvider provider)
   {
      switch (Type.GetTypeCode(conversionType))
      {
         case TypeCode.Boolean:
            return this.ToBoolean(null);
         case TypeCode.Byte:
            return this.ToByte(null);
         case TypeCode.Char:
            return this.ToChar(null);
         case TypeCode.DateTime:
            return this.ToDateTime(null);
         case TypeCode.Decimal:
            return this.ToDecimal(null);
         case TypeCode.Double:
            return this.ToDouble(null);
         case TypeCode.Int16:
            return this.ToInt16(null);
         case TypeCode.Int32:
            return this.ToInt32(null);
         case TypeCode.Int64:
            return this.ToInt64(null);
         case TypeCode.Object:
            if (typeof(Temperature).Equals(conversionType))
               return this;
            else
               throw new InvalidCastException(String.Format("Conversion to a {0} is not supported.",
                                                            conversionType.Name));
         case TypeCode.SByte:
            return this.ToSByte(null);
         case TypeCode.Single:
            return this.ToSingle(null);
         case TypeCode.String:
            return this.ToString(provider);
         case TypeCode.UInt16:
            return this.ToUInt16(null);
         case TypeCode.UInt32:
            return this.ToUInt32(null);
         case TypeCode.UInt64:
            return this.ToUInt64(null);
         default:
            throw new InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name));
      }
   }

   public ushort ToUInt16(IFormatProvider provider)
   {
      if (this.m_Temp < UInt16.MinValue || this.m_Temp > UInt16.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt16 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToUInt16(this.m_Temp);
   }

   public uint ToUInt32(IFormatProvider provider)
   {
      if (this.m_Temp < UInt32.MinValue || this.m_Temp > UInt32.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt32 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToUInt32(this.m_Temp);
   }

   public ulong ToUInt64(IFormatProvider provider)
   {
      if (this.m_Temp < UInt64.MinValue || this.m_Temp > UInt64.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt64 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToUInt64(this.m_Temp);
   }
}

open System
open System.Globalization

type Temperature(temperature) =
    member _.Celsius = temperature

    member _.Kelvin =
        temperature + 273.15m

    member _.Fahrenheit =
        Math.Round(temperature * 9m / 5m + 32m, 2)

    override _.ToString() =
        $"{temperature:N2} °C"

    // IConvertible implementations.
    interface IConvertible with
        member _.GetTypeCode() =
            TypeCode.Object

        member _.ToBoolean(provider: IFormatProvider) =
            temperature <> 0M

        member _.ToByte(provider: IFormatProvider) =
            if uint8 temperature < Byte.MinValue || uint8 temperature > Byte.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Byte type.")
            else
            Decimal.ToByte temperature

        member _.ToChar(provider: IFormatProvider) =
            raise (InvalidCastException "Temperature to Char conversion is not supported.")

        member _.ToDateTime(provider: IFormatProvider) =
            raise (InvalidCastException "Temperature to DateTime conversion is not supported.")

        member _.ToDecimal(provider: IFormatProvider) =
            temperature

        member _.ToDouble(provider: IFormatProvider) =
            Decimal.ToDouble temperature

        member _.ToInt16(provider: IFormatProvider) =
            if int16 temperature < Int16.MinValue || int16 temperature > Int16.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Int16 type.")
            else
                Decimal.ToInt16 temperature

        member _.ToInt32(provider: IFormatProvider) =
            if int temperature < Int32.MinValue || int temperature > Int32.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Int32 type.")
            else
                Decimal.ToInt32 temperature

        member _.ToInt64(provider: IFormatProvider) =
            if int64 temperature < Int64.MinValue || int64 temperature > Int64.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Int64 type.")
            else
                Decimal.ToInt64 temperature

        member _.ToSByte(provider: IFormatProvider) =
            if int8 temperature < SByte.MinValue || int8 temperature > SByte.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the SByte type.")
            else
                Decimal.ToSByte temperature

        member _.ToSingle(provider: IFormatProvider) =
            Decimal.ToSingle temperature

        member _.ToString(provider: IFormatProvider) =
           temperature.ToString("N2", provider) + " °C"

        member this.ToType(conversionType: Type, provider: IFormatProvider) =
            let this = this :> IConvertible
            match Type.GetTypeCode conversionType with
            | TypeCode.Boolean ->
                this.ToBoolean null
            | TypeCode.Byte ->
                this.ToByte null
            | TypeCode.Char ->
                this.ToChar null
            | TypeCode.DateTime ->
                this.ToDateTime null
            | TypeCode.Decimal ->
                this.ToDecimal null
            | TypeCode.Double ->
                this.ToDouble null
            | TypeCode.Int16 ->
                this.ToInt16 null
            | TypeCode.Int32 ->
                this.ToInt32 null
            | TypeCode.Int64 ->
                this.ToInt64 null
            | TypeCode.Object ->
                if typeof<Temperature>.Equals conversionType then
                    this
                else
                    raise (InvalidCastException $"Conversion to a {conversionType.Name} is not supported.")
            | TypeCode.SByte ->
                this.ToSByte null
            | TypeCode.Single ->
                this.ToSingle null
            | TypeCode.String ->
                this.ToString provider
            | TypeCode.UInt16 ->
                this.ToUInt16 null
            | TypeCode.UInt32 ->
                this.ToUInt32 null
            | TypeCode.UInt64 ->
                this.ToUInt64 null
            | _ ->
                raise (InvalidCastException $"Conversion to {conversionType.Name} is not supported.")

        member _.ToUInt16(provider: IFormatProvider) =
            if uint16 temperature < UInt16.MinValue || uint16 temperature > UInt16.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the UInt16 type.")
            else
                Decimal.ToUInt16 temperature

        member _.ToUInt32(provider: IFormatProvider) =
            if uint temperature < UInt32.MinValue || uint temperature > UInt32.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the UInt32 type.")
            else
                Decimal.ToUInt32 temperature

        member _.ToUInt64(provider: IFormatProvider) =
            if uint64 temperature < UInt64.MinValue || uint64 temperature > UInt64.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the UInt64 type.")
            else
                Decimal.ToUInt64 temperature

Imports System.Globalization

Public Class Temperature : Implements IConvertible
   Private m_Temp As Decimal

   Public Sub New(temperature As Decimal)
      Me.m_Temp = temperature
   End Sub
   
   Public ReadOnly Property Celsius() As Decimal
      Get
         Return Me.m_Temp
      End Get   
   End Property
   
   Public ReadOnly Property Kelvin() As Decimal
      Get
         Return Me.m_Temp + 273.15d   
      End Get
   End Property
   
   Public ReadOnly Property Fahrenheit() As Decimal
      Get
         Return Math.Round(CDec(Me.m_Temp * 9 / 5 + 32), 2)
      End Get      
   End Property
   
   Public Overrides Function ToString() As String
      Return m_Temp.ToString("N2") & " °C"
   End Function

   ' IConvertible implementations.
   Public Function GetTypeCode() As TypeCode _
                   Implements IConvertible.GetTypeCode
      Return TypeCode.Object
   End Function
   
   Public Function ToBoolean(provider As IFormatProvider) As Boolean _
                   Implements IConvertible.ToBoolean
      If m_Temp = 0 Then
         Return False
      Else
         Return True
      End If
   End Function 
   
   Public Function ToByte(provider As IFormatProvider) As Byte _
                   Implements IConvertible.ToByte
      If m_Temp < Byte.MinValue Or m_Temp > Byte.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Byte type.", _ 
                                                   Me.m_Temp)) 
      Else
         Return Decimal.ToByte(Me.m_Temp)
      End If       
   End Function
   
   Public Function ToChar(provider As IFormatProvider) As Char _
                   Implements IConvertible.ToChar
      Throw New InvalidCastException("Temperature to Char conversion is not supported.")
   End Function 
   
   Public Function ToDateTime(provider As IFormatProvider) As Date _
                   Implements IConvertible.ToDateTime
      Throw New InvalidCastException("Temperature to DateTime conversion is not supported.")
   End Function
   
   Public Function ToDecimal(provider As IFormatProvider) As Decimal _
                   Implements IConvertible.ToDecimal
      Return Me.m_Temp
   End Function
   
   Public Function ToDouble(provider As IFormatProvider) As Double _
                   Implements IConvertible.ToDouble
      Return Decimal.ToDouble(Me.m_Temp)
   End Function   
   
   Public Function ToInt16(provider As IFormatProvider) As Int16 _
                   Implements IConvertible.ToInt16
      If Me.m_Temp < Int16.MinValue Or Me.m_Temp > Int16.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int16 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToInt16(Me.m_Temp)   
      End If
   End Function
   
   Public Function ToInt32(provider As IFormatProvider) As Int32 _
                   Implements IConvertible.ToInt32
      If Me.m_Temp < Int32.MinValue Or Me.m_Temp > Int32.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int32 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToInt32(Me.m_Temp)
      End If      
   End Function
   
   Public Function ToInt64(provider As IFormatProvider) As Int64 _
                   Implements IConvertible.ToInt64
      If Me.m_Temp < Int64.MinValue Or Me.m_Temp > Int64.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int64 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToInt64(Me.m_Temp)
      End If      
   End Function
   
   Public Function ToSByte(provider As IFormatProvider) As SByte _
                   Implements IConvertible.ToSByte
      If Me.m_Temp < SByte.MinValue Or Me.m_Temp > SByte.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the SByte type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToSByte(Me.m_Temp)
      End If      
   End Function

   Public Function ToSingle(provider As IFormatProvider) As Single _
                   Implements IConvertible.ToSingle
      Return Decimal.ToSingle(Me.m_Temp)
   End Function

   Public Overloads Function ToString(provider As IFormatProvider) As String _
                   Implements IConvertible.ToString
      Return m_Temp.ToString("N2", provider) & " °C"
   End Function
   
   Public Function ToType(conversionType As Type, provider As IFormatProvider) As Object _
                   Implements IConvertible.ToType
      Select Case Type.GetTypeCode(conversionType)
         Case TypeCode.Boolean 
            Return Me.ToBoolean(Nothing)
         Case TypeCode.Byte
            Return Me.ToByte(Nothing)
         Case TypeCode.Char
            Return Me.ToChar(Nothing)
         Case TypeCode.DateTime
            Return Me.ToDateTime(Nothing)
         Case TypeCode.Decimal
            Return Me.ToDecimal(Nothing)
         Case TypeCode.Double
            Return Me.ToDouble(Nothing)
         Case TypeCode.Int16
            Return Me.ToInt16(Nothing)
         Case TypeCode.Int32
            Return Me.ToInt32(Nothing)
         Case TypeCode.Int64
            Return Me.ToInt64(Nothing)
         Case TypeCode.Object
            If GetType(Temperature).Equals(conversionType) Then
               Return Me
            Else
               Throw New InvalidCastException(String.Format("Conversion to a {0} is not supported.", _
                                                            conversionType.Name))
            End If 
         Case TypeCode.SByte
            Return Me.ToSByte(Nothing)
         Case TypeCode.Single
            Return Me.ToSingle(Nothing)
         Case TypeCode.String
            Return Me.ToString(provider)
         Case TypeCode.UInt16
            Return Me.ToUInt16(Nothing)
         Case TypeCode.UInt32
            Return Me.ToUInt32(Nothing)
         Case TypeCode.UInt64
            Return Me.ToUInt64(Nothing)   
         Case Else
            Throw New InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name))   
      End Select
   End Function
   
   Public Function ToUInt16(provider As IFormatProvider) As UInt16 _
                   Implements IConvertible.ToUInt16
      If Me.m_Temp < UInt16.MinValue Or Me.m_Temp > UInt16.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt16 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToUInt16(Me.m_Temp)
      End If   
   End Function

   Public Function ToUInt32(provider As IFormatProvider) As UInt32 _
                   Implements IConvertible.ToUInt32
      If Me.m_Temp < UInt32.MinValue Or Me.m_Temp > UInt32.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt32 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToUInt32(Me.m_Temp)
      End If   
   End Function
   
   Public Function ToUInt64(provider As IFormatProvider) As UInt64 _
                   Implements IConvertible.ToUInt64
      If Me.m_Temp < UInt64.MinValue Or Me.m_Temp > UInt64.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt64 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToUInt64(Me.m_temp)
      End If   
   End Function
End Class

The following example shows that when a Temperature object is passed as a parameter to the ToDecimal(Object, IFormatProvider) method, the IConvertible.ToDecimal implementation of the Temperature class is called to perform the conversion.

public class Example
{
   public static void Main()
   {
      Temperature cold = new Temperature(-40);
      Temperature freezing = new Temperature(0);
      Temperature boiling = new Temperature(100);

      Console.WriteLine(Convert.ToDecimal(cold, null));
      Console.WriteLine(Convert.ToDecimal(freezing, null));
      Console.WriteLine(Convert.ToDecimal(boiling, null));
   }
}
// The example dosplays the following output:
//       -40
//       0
//       100

let cold = Temperature -40
let freezing = Temperature 0
let boiling = Temperature 100

printfn $"{Convert.ToDecimal(cold, null)}"
printfn $"{Convert.ToDecimal(freezing, null)}"
printfn $"{Convert.ToDecimal(boiling, null)}"
// The example dosplays the following output:
//       -40
//       0
//       100

Module Example
   Public Sub Main()
      Dim cold As New Temperature(-40)
      Dim freezing As New Temperature(0)
      Dim boiling As New Temperature(100)
      
      Console.WriteLine(Convert.ToDecimal(cold, Nothing))
      Console.WriteLine(Convert.ToDecimal(freezing, Nothing))
      Console.WriteLine(Convert.ToDecimal(boiling, Nothing))
   End Sub
End Module
' The example displays the following output:
'       -40
'       0
'       100

Remarks

The return value is the result of invoking the IConvertible.ToDecimal method of the underlying type of value.

provider enables the user to specify culture-specific conversion information about the contents of value. The base types ignore provider; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

Applies to

ToDecimal(SByte)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 8-bit signed integer to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::SByte value);

[System.CLSCompliant(false)]
public static decimal ToDecimal (sbyte value);

[<System.CLSCompliant(false)>]
static member ToDecimal : sbyte -> decimal

Public Shared Function ToDecimal (value As SByte) As Decimal

Parameters

value: SByte

The 8-bit signed integer to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Attributes: CLSCompliantAttribute

Examples

The following example converts each element in an array of signed bytes to a Decimal value.

sbyte[] numbers = { SByte.MinValue, -23, 0, 17, SByte.MaxValue };
decimal result;

foreach (sbyte number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the SByte value {0} to {1}.", number, result);
}
//       Converted the SByte value -128 to -128.
//       Converted the SByte value -23 to -23.
//       Converted the SByte value 0 to 0.
//       Converted the SByte value 17 to 17.
//       Converted the SByte value 127 to 127.

let numbers = 
    [| SByte.MinValue, -23, 0, 17, SByte.MaxValue |]

for number in numbers do
    let result = Convert.ToDecimal number
    printfn $"Converted the SByte value {number} to {result}."
//       Converted the SByte value -128 to -128.
//       Converted the SByte value -23 to -23.
//       Converted the SByte value 0 to 0.
//       Converted the SByte value 17 to 17.
//       Converted the SByte value 127 to 127.

Dim numbers() As SByte = { SByte.MinValue, -23, 0, 17, SByte.MaxValue }
Dim result As Decimal

For Each number As SByte In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the SByte value {0} to {1}.", number, result)
Next
'       Converted the SByte value -128 to -128.
'       Converted the SByte value -23 to -23.
'       Converted the SByte value 0 to 0.
'       Converted the SByte value 17 to 17.
'       Converted the SByte value 127 to 127.

Applies to

ToDecimal(UInt32)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 32-bit unsigned integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::UInt32 value);

[System.CLSCompliant(false)]
public static decimal ToDecimal (uint value);

[<System.CLSCompliant(false)>]
static member ToDecimal : uint32 -> decimal

Public Shared Function ToDecimal (value As UInteger) As Decimal

Parameters

value: UInt32

The 32-bit unsigned integer to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Attributes: CLSCompliantAttribute

Examples

The following example converts an array of unsigned integers to Decimal values.

uint[] numbers = { UInt32.MinValue, 121, 12345, UInt32.MaxValue };
decimal result;

foreach (uint number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the UInt32 value {0} to {1}.",
                     number, result);
}
// The example displays the following output:
//       Converted the UInt32 value 0 to 0.
//       Converted the UInt32 value 121 to 121.
//       Converted the UInt32 value 12345 to 12345.
//       Converted the UInt32 value 4294967295 to 4294967295.

let numbers =
    [| UInt32.MinValue; 121u; 12345u; UInt32.MaxValue |]

for number in numbers do
    let result = Convert.ToDecimal number
    printfn $"Converted the UInt32 value {number} to {result}."
// The example displays the following output:
//       Converted the UInt32 value 0 to 0.
//       Converted the UInt32 value 121 to 121.
//       Converted the UInt32 value 12345 to 12345.
//       Converted the UInt32 value 4294967295 to 4294967295.

Dim numbers() As UInteger = { UInt32.MinValue, 121, 12345, UInt32.MaxValue }
Dim result As Decimal

For Each number As UInteger In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the UInt32 value {0} to {1}.", _
                     number, result)
Next   
' The example displays the following output:
'       Converted the UInt32 value 0 to 0.
'       Converted the UInt32 value 121 to 121.
'       Converted the UInt32 value 12345 to 12345.
'       Converted the UInt32 value 4294967295 to 4294967295.

Applies to

ToDecimal(Object)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified object to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::Object ^ value);

public static decimal ToDecimal (object value);

public static decimal ToDecimal (object? value);

static member ToDecimal : obj -> decimal

Public Shared Function ToDecimal (value As Object) As Decimal

Parameters

value: Object

An object that implements the IConvertible interface, or null.

Returns

Decimal

A decimal number that is equivalent to value, or 0 (zero) if value is null.

Exceptions

FormatException

value is not in an appropriate format for a Decimal type.

InvalidCastException

value does not implement the IConvertible interface.

-or-

The conversion is not supported.

OverflowException

value represents a number that is less than Decimal.MinValue or greater than Decimal.MaxValue.

Examples

The following example tries to convert each element in an object array to a Decimal value.

object[] values = { true, 'a', 123, 1.764e32, "9.78", "1e-02",
                    1.67e03, "A100", "1,033.67", DateTime.Now,
                    Double.MaxValue };
decimal result;

foreach (object value in values)
{
   try {
      result = Convert.ToDecimal(value);
      Console.WriteLine("Converted the {0} value {1} to {2}.",
                        value.GetType().Name, value, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is out of range of the Decimal type.",
                        value.GetType().Name, value);
   }
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not recognized as a valid Decimal value.",
                        value.GetType().Name, value);
   }
   catch (InvalidCastException) {
      Console.WriteLine("Conversion of the {0} value {1} to a Decimal is not supported.",
                        value.GetType().Name, value);
   }
}
// The example displays the following output:
//    Converted the Boolean value True to 1.
//    Conversion of the Char value a to a Decimal is not supported.
//    Converted the Int32 value 123 to 123.
//    The Double value 1.764E+32 is out of range of the Decimal type.
//    Converted the String value 9.78 to 9.78.
//    The String value 1e-02 is not recognized as a valid Decimal value.
//    Converted the Double value 1670 to 1670.
//    The String value A100 is not recognized as a valid Decimal value.
//    Converted the String value 1,033.67 to 1033.67.
//    Conversion of the DateTime value 10/15/2008 05:40:42 PM to a Decimal is not supported.
//    The Double value 1.79769313486232E+308 is out of range of the Decimal type.

let values: obj[] =
    [| true; 'a'; 123; 1.764e32; "9.78"; "1e-02"; 1.67e03
       "A100"; "1,033.67"; DateTime.Now; Double.MaxValue |]

for value in values do
    try
        let result = Convert.ToDecimal value
        printfn $"Converted the {value.GetType().Name} value {value} to {result}."
    with
    | :? OverflowException ->
        printfn $"The {value.GetType().Name} value {value} is out of range of the Decimal type."
    | :? FormatException ->
        printfn $"The {value.GetType().Name} value {value} is not recognized as a valid Decimal value."
    | :? InvalidCastException ->
        printfn $"Conversion of the {value.GetType().Name} value {value} to a Decimal is not supported."
// The example displays the following output:
//    Converted the Boolean value True to 1.
//    Conversion of the Char value a to a Decimal is not supported.
//    Converted the Int32 value 123 to 123.
//    The Double value 1.764E+32 is out of range of the Decimal type.
//    Converted the String value 9.78 to 9.78.
//    The String value 1e-02 is not recognized as a valid Decimal value.
//    Converted the Double value 1670 to 1670.
//    The String value A100 is not recognized as a valid Decimal value.
//    Converted the String value 1,033.67 to 1033.67.
//    Conversion of the DateTime value 10/15/2008 05:40:42 PM to a Decimal is not supported.
//    The Double value 1.79769313486232E+308 is out of range of the Decimal type.

Dim values() As Object = { True, "a"c, 123, 1.764e32, "9.78", "1e-02", _
                           1.67e03, "A100", "1,033.67", Date.Now, _
                           Double.MaxValue }   
Dim result As Decimal

For Each value As Object In values
   Try
      result = Convert.ToDecimal(value)
      Console.WriteLine("Converted the {0} value {1} to {2}.", _
                        value.GetType().Name, value, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is out of range of the Decimal type.", _
                        value.GetType().Name, value)
   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not recognized as a valid Decimal value.", _
                        value.GetType().Name, value)
   Catch e As InvalidCastException
      Console.WriteLine("Conversion of the {0} value {1} to a Decimal is not supported.", _
                        value.GetType().Name, value)
   End Try                     
Next
' The example displays the following output:
'    Converted the Boolean value True to 1.
'    Conversion of the Char value a to a Decimal is not supported.
'    Converted the Int32 value 123 to 123.
'    The Double value 1.764E+32 is out of range of the Decimal type.
'    Converted the String value 9.78 to 9.78.
'    The String value 1e-02 is not recognized as a valid Decimal value.
'    Converted the Double value 1670 to 1670.
'    The String value A100 is not recognized as a valid Decimal value.
'    Converted the String value 1,033.67 to 1033.67.
'    Conversion of the DateTime value 10/15/2008 05:40:42 PM to a Decimal is not supported.
'    The Double value 1.79769313486232E+308 is out of range of the Decimal type.

Remarks

The return value is the result of invoking the IConvertible.ToDecimal method of the underlying type of value.

Applies to

ToDecimal(Int64)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified 64-bit signed integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(long value);

public static decimal ToDecimal (long value);

static member ToDecimal : int64 -> decimal

Public Shared Function ToDecimal (value As Long) As Decimal

Parameters

value: Int64

The 64-bit signed integer to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Examples

The following example converts an Int64 value to a Decimal value.

public:
   void ConvertLongDecimal( Int64 longVal )
   {
      Decimal decimalVal;
      
      // Long to decimal conversion cannot overflow.
      decimalVal = System::Convert::ToDecimal( longVal );
      System::Console::WriteLine( " {0} as a decimal is {1}",
         longVal, decimalVal );
      
      // Decimal to long conversion can overflow.
      try
      {
         longVal = System::Convert::ToInt64( decimalVal );
         System::Console::WriteLine( " {0} as a long is {1}",
         decimalVal, longVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine( "Overflow in decimal-to-long conversion." );
      }
   }

public void ConvertLongDecimal(long longVal) {

    decimal	decimalVal;
    
    // Long to decimal conversion cannot overflow.
    decimalVal = System.Convert.ToDecimal(longVal);
    System.Console.WriteLine("{0} as a decimal is {1}",
            longVal, decimalVal);

    // Decimal to long conversion can overflow.
    try {
        longVal = System.Convert.ToInt64(decimalVal);
        System.Console.WriteLine("{0} as a long is {1}",
            decimalVal, longVal);
    }
    catch (System.OverflowException) {
        System.Console.WriteLine(
            "Overflow in decimal-to-long conversion.");
    }
}

let convertLongDecimal (longVal: int64) =
    // Long to decimal conversion cannot overflow.
    let decimalVal = Convert.ToDecimal longVal
    printfn $"{longVal} as a decimal is {decimalVal}"

    // Decimal to long conversion can overflow.
    try
        let longVal = Convert.ToInt64 decimalVal
        printfn $"{decimalVal} as a long is {longVal}"
    with :? OverflowException ->
        printfn "Overflow in decimal-to-long conversion."

Public Sub ConvertLongDecimal(ByVal longVal As Long)

    Dim decimalVal As Decimal

    'Long to Decimal conversion cannot overflow.
    decimalVal = System.Convert.ToDecimal(longVal)
    System.Console.WriteLine("{0} as a Decimal is {1}", _
                              longVal, decimalVal)

    'Decimal to Long conversion can overflow.
    Try
        longVal = System.Convert.ToInt64(decimalVal)
        System.Console.WriteLine("{0} as a Long is {1}", _
                                  decimalVal, longVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in decimal-to-long conversion.")
    End Try
End Sub

Applies to

ToDecimal(Int32)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified 32-bit signed integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(int value);

public static decimal ToDecimal (int value);

static member ToDecimal : int -> decimal

Public Shared Function ToDecimal (value As Integer) As Decimal

Parameters

value: Int32

The 32-bit signed integer to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Examples

The following example converts an array of signed integers to Decimal values.

int[] numbers = { Int32.MinValue, -1000, 0, 1000, Int32.MaxValue };
decimal result;

foreach (int number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the Int32 value {0} to the Decimal value {1}.",
                     number, result);
}
// The example displays the following output:
//    Converted the Int32 value -2147483648 to the Decimal value -2147483648.
//    Converted the Int32 value -1000 to the Decimal value -1000.
//    Converted the Int32 value 0 to the Decimal value 0.
//    Converted the Int32 value 1000 to the Decimal value 1000.
//    Converted the Int32 value 2147483647 to the Decimal value 2147483647.

let numbers =
    [| Int32.MinValue; -1000; 0; 1000; Int32.MaxValue |]

for number in numbers do
    let result = Convert.ToDecimal number
    printfn $"Converted the Int32 value {number} to the Decimal value {result}."
// The example displays the following output:
//    Converted the Int32 value -2147483648 to the Decimal value -2147483648.
//    Converted the Int32 value -1000 to the Decimal value -1000.
//    Converted the Int32 value 0 to the Decimal value 0.
//    Converted the Int32 value 1000 to the Decimal value 1000.
//    Converted the Int32 value 2147483647 to the Decimal value 2147483647.

Dim numbers() As Integer = { Int32.MinValue, -1000, 0, 1000, Int32.MaxValue }
Dim result As Decimal

For Each number As Integer In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the Int32 value {0} to the Decimal value {1}.", _
                     number, result)
Next
' The example displays the following output:
'    Converted the Int32 value -2147483648 to the Decimal value -2147483648.
'    Converted the Int32 value -1000 to the Decimal value -1000.
'    Converted the Int32 value 0 to the Decimal value 0.
'    Converted the Int32 value 1000 to the Decimal value 1000.
'    Converted the Int32 value 2147483647 to the Decimal value 2147483647.

Applies to

ToDecimal(Int16)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified 16-bit signed integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(short value);

public static decimal ToDecimal (short value);

static member ToDecimal : int16 -> decimal

Public Shared Function ToDecimal (value As Short) As Decimal

Parameters

value: Int16

The 16-bit signed integer to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Examples

The following example converts an array of 16-bit signed integers to Decimal values.

short[] numbers = { Int16.MinValue, -1000, 0, 1000, Int16.MaxValue };
decimal result;

foreach (short number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the Int16 value {0} to the Decimal value {1}.",
                     number, result);
}
// The example displays the following output:
//       Converted the Int16 value -32768 to the Decimal value -32768.
//       Converted the Int16 value -1000 to the Decimal value -1000.
//       Converted the Int16 value 0 to the Decimal value 0.
//       Converted the Int16 value 1000 to the Decimal value 1000.
//       Converted the Int16 value 32767 to the Decimal value 32767.

let numbers = 
    [| Int16.MinValue; -1000s; 0s; 1000s; Int16.MaxValue |]

for number in numbers do
    let result = Convert.ToDecimal number
    printfn $"Converted the Int16 value {number} to the Decimal value {result}."
// The example displays the following output:
//       Converted the Int16 value -32768 to the Decimal value -32768.
//       Converted the Int16 value -1000 to the Decimal value -1000.
//       Converted the Int16 value 0 to the Decimal value 0.
//       Converted the Int16 value 1000 to the Decimal value 1000.
//       Converted the Int16 value 32767 to the Decimal value 32767.

Dim numbers() As Short = { Int16.MinValue, -1000, 0, 1000, Int16.MaxValue }
Dim result As Decimal

For Each number As Short In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the Int16 value {0} to the Decimal value {1}.", _
                     number, result)
Next
' The example displays the following output:
'       Converted the Int16 value -32768 to the Decimal value -32768.
'       Converted the Int16 value -1000 to the Decimal value -1000.
'       Converted the Int16 value 0 to the Decimal value 0.
'       Converted the Int16 value 1000 to the Decimal value 1000.
'       Converted the Int16 value 32767 to the Decimal value 32767.

Applies to

ToDecimal(Double)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified double-precision floating-point number to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(double value);

public static decimal ToDecimal (double value);

static member ToDecimal : double -> decimal

Public Shared Function ToDecimal (value As Double) As Decimal

Parameters

value: Double

The double-precision floating-point number to convert.

Returns

Decimal

A decimal number that is equivalent to value.

Exceptions

OverflowException

value is greater than Decimal.MaxValue or less than Decimal.MinValue.

Examples

The following example converts a Double value to a Decimal value.

public:
   void ConvertDoubleDecimal( double doubleVal )
   {
      Decimal decimalVal;
      
      // Conversion from double to decimal cannot overflow.
      decimalVal = System::Convert::ToDecimal( doubleVal );
      System::Console::WriteLine( " {0} as a decimal is: {1}",
         doubleVal, decimalVal );
      
      // Decimal to double conversion can overflow.
      try
      {
         doubleVal = System::Convert::ToDouble( decimalVal );
         System::Console::WriteLine( " {0} as a double is: {1}",
         decimalVal, doubleVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine( "Overflow in decimal-to-double conversion." );
      }
   }

public void ConvertDoubleDecimal(decimal decimalVal){
    
    double doubleVal;
    
    // Decimal to double conversion cannot overflow.
 doubleVal = System.Convert.ToDouble(decimalVal);
    System.Console.WriteLine("{0} as a double is: {1}",
            decimalVal, doubleVal);

    // Conversion from double to decimal can overflow.
    try
 {
       decimalVal = System.Convert.ToDecimal(doubleVal);
    System.Console.WriteLine ("{0} as a decimal is: {1}",
        doubleVal, decimalVal);
    }
    catch (System.OverflowException) {
        System.Console.WriteLine(
            "Overflow in double-to-double conversion.");
    }
}

let convertDoubleDecimal (decimalVal: float) =
    // Decimal to double conversion cannot overflow.
    let doubleVal = 
        Convert.ToDouble decimalVal
    printfn $"{decimalVal} as a double is: {doubleVal}"

    // Conversion from double to decimal can overflow.
    try
        let decimalVal = Convert.ToDecimal doubleVal
        printfn $"{doubleVal} as a decimal is: {decimalVal}"
    with :? OverflowException ->
        printfn "Overflow in double-to-double conversion."

Public Sub ConvertDoubleDecimal(ByVal decimalVal As Decimal)

    Dim doubleVal As Double

    ' Decimal to Double conversion cannot overflow.
    doubleVal = System.Convert.ToDouble(decimalVal)
    System.Console.WriteLine("{0} as a Double is: {1}", _
                             decimalVal, doubleVal)
    
    ' Conversion from Double to Decimal can overflow.
    Try
       decimalVal = System.Convert.ToDecimal(doubleVal)
       System.Console.WriteLine("{0} as a Decimal is: {1}", _
                                doubleVal, decimalVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in Double-to-Decimal conversion.")
    End Try

End Sub

Remarks

The Decimal value returned by this method contains a maximum of 15 significant digits. If the value parameter contains more than 15 significant digits, it is rounded using rounding to nearest. The following example illustrates how the Convert.ToDecimal(Double) method uses rounding to nearest to return a Decimal value with 15 significant digits.

Console.WriteLine(Convert.ToDecimal(123456789012345500.12D));  // Displays 123456789012346000
Console.WriteLine(Convert.ToDecimal(123456789012346500.12D));  // Displays 123456789012346000

Console.WriteLine(Convert.ToDecimal(10030.12345678905D));      // Displays 10030.123456789
Console.WriteLine(Convert.ToDecimal(10030.12345678915D));      // Displays 10030.1234567892

printfn $"{Convert.ToDecimal 123456789012345500.12}"  // Displays 123456789012346000
printfn $"{Convert.ToDecimal 123456789012346500.12}"  // Displays 123456789012346000

printfn $"{Convert.ToDecimal 10030.12345678905}"      // Displays 10030.123456789
printfn $"{Convert.ToDecimal 10030.12345678915}"      // Displays 10030.1234567892

Console.WriteLine(Convert.ToDecimal(123456789012345500.12R))   ' Displays 123456789012346000
Console.WriteLine(Convert.ToDecimal(123456789012346500.12R))   ' Displays 123456789012346000

Console.WriteLine(Convert.ToDecimal(10030.12345678905R))       ' Displays 10030.123456789 
Console.WriteLine(Convert.ToDecimal(10030.12345678915R))       ' Displays 10030.1234567892

Applies to

ToDecimal(Decimal)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Returns the specified decimal number; no actual conversion is performed.

public:
 static System::Decimal ToDecimal(System::Decimal value);

public static decimal ToDecimal (decimal value);

static member ToDecimal : decimal -> decimal

Public Shared Function ToDecimal (value As Decimal) As Decimal

Parameters

value: Decimal

A decimal number.

Returns

Decimal

value is returned unchanged.

Applies to

ToDecimal(DateTime)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Calling this method always throws InvalidCastException.

public:
 static System::Decimal ToDecimal(DateTime value);

public static decimal ToDecimal (DateTime value);

static member ToDecimal : DateTime -> decimal

Public Shared Function ToDecimal (value As DateTime) As Decimal

Parameters

value: DateTime

The date and time value to convert.

Returns

Decimal

This conversion is not supported. No value is returned.

Exceptions

InvalidCastException

This conversion is not supported.

Applies to

ToDecimal(Char)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Calling this method always throws InvalidCastException.

public:
 static System::Decimal ToDecimal(char value);

public static decimal ToDecimal (char value);

static member ToDecimal : char -> decimal

Public Shared Function ToDecimal (value As Char) As Decimal

Parameters

value: Char

The Unicode character to convert.

Returns

Decimal

This conversion is not supported. No value is returned.

Exceptions

InvalidCastException

This conversion is not supported.

Examples

The following example attempts to convert a Char value to Decimal, and throws InvalidCastException upon failure.

public:
   void ConvertCharDecimal( Char charVal )
   {
      Decimal decimalVal = 0;
      
      // Char to decimal conversion is not supported and will always
      // throw an InvalidCastException.
      try
      {
         decimalVal = System::Convert::ToDecimal( charVal );
      }
      catch ( System::InvalidCastException^ ) 
      {
         System::Console::WriteLine(
            "Char-to-Decimal conversion is not supported by the .NET Framework." );
      }
      
      //Decimal to char conversion is also not supported.
      try
      {
         charVal = System::Convert::ToChar( decimalVal );
      }
      catch ( System::InvalidCastException^ ) 
      {
         System::Console::WriteLine(
            "Decimal-to-Char conversion is not supported by the .NET Framework." );
      }
   }

public void ConvertCharDecimal(char charVal) {
    Decimal decimalVal = 0;
    
    // Char to decimal conversion is not supported and will always
    // throw an InvalidCastException.
    try {
        decimalVal = System.Convert.ToDecimal(charVal);
    }
    catch (System.InvalidCastException) {
        System.Console.WriteLine(
            "Char-to-Decimal conversion is not supported " +
            "by the .NET Framework.");
    }

    //Decimal to char conversion is also not supported.
    try {
        charVal = System.Convert.ToChar(decimalVal);
    }
    catch (System.InvalidCastException) {
        System.Console.WriteLine(
            "Decimal-to-Char conversion is not supported " +
            "by the .NET Framework.");
    }
}

let convertCharDecimal (charVal: char) =
    let decimalVal = 0m

    // Char to decimal conversion is not supported and will always
    // throw an InvalidCastException.
    try
        let decimalVal = Convert.ToDecimal charVal
        ()
    with :? InvalidCastException ->
        printfn "Char-to-Decimal conversion is not supported by the .NET Runtime."

    //Decimal to char conversion is also not supported.
    try
        let charVal = Convert.ToChar decimalVal
        ()
    with :? InvalidCastException ->
        printfn "Decimal-to-Char conversion is not supported by the .NET Runtime."

Public Sub ConvertCharDecimal(ByVal charVal As Char)
    Dim decimalVal As [Decimal] = 0

    ' Char to decimal conversion is not supported and will always
    ' throw an InvalidCastException.
    Try
        decimalVal = System.Convert.ToDecimal(charVal)
    Catch exception As System.InvalidCastException
        System.Console.WriteLine( _
             "Char-to-Decimal conversion is not supported " + _
             "by the .NET Framework.")
    End Try

    'Decimal to char conversion is also not supported.
    Try
        charVal = System.Convert.ToChar(decimalVal)
    Catch exception As System.InvalidCastException
        System.Console.WriteLine( _
            "Decimal-to-Char conversion is not supported " + _
            "by the .NET Framework.")
    End Try
End Sub

Applies to

ToDecimal(Byte)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the value of the specified 8-bit unsigned integer to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::Byte value);

public static decimal ToDecimal (byte value);

static member ToDecimal : byte -> decimal

Public Shared Function ToDecimal (value As Byte) As Decimal

Parameters

value: Byte

The 8-bit unsigned integer to convert.

Returns

Decimal

The decimal number that is equivalent to value.

Examples

The following example converts a Byte value to a Decimal value.

public:
   void ConvertByteDecimal( Byte byteVal )
   {
      Decimal decimalVal;
      
      // Byte to decimal conversion will not overflow.
      decimalVal = System::Convert::ToDecimal( byteVal );
      System::Console::WriteLine( "The Byte as a decimal is {0}.",
         decimalVal );
      
      // Decimal to Byte conversion can overflow.
      try
      {
         byteVal = System::Convert::ToByte( decimalVal );
         System::Console::WriteLine( "The Decimal as a Byte is {0}.",
         byteVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine(
            "The decimal value is too large for a Byte." );
      }
   }

public void ConvertByteDecimal(byte byteVal) {
    decimal decimalVal;

    // Byte to decimal conversion will not overflow.
    decimalVal = System.Convert.ToDecimal(byteVal);
    System.Console.WriteLine("The byte as a decimal is {0}.",
        decimalVal);

    // Decimal to byte conversion can overflow.
    try {
        byteVal = System.Convert.ToByte(decimalVal);
        System.Console.WriteLine("The Decimal as a byte is {0}.",
            byteVal);
    }
    catch (System.OverflowException) {
        System.Console.WriteLine(
            "The decimal value is too large for a byte.");
    }
}

let convertByteDecimal (byteVal: byte) =
    // Byte to decimal conversion will not overflow.
    let decimalVal = Convert.ToDecimal byteVal
    printfn $"The byte as a decimal is {decimalVal}."

    // Decimal to byte conversion can overflow.
    try
        let byteVal = Convert.ToByte decimalVal
        printfn $"The Decimal as a byte is {byteVal}."
    with :? OverflowException ->
        printfn "The decimal value is too large for a byte."

Public Sub ConvertByteDecimal(ByVal byteVal As Byte)
    Dim decimalVal As Decimal

    ' Byte to decimal conversion will not overflow.
    decimalVal = System.Convert.ToDecimal(byteVal)
    System.Console.WriteLine("The byte as a decimal is {0}.", _
                              decimalVal)

    ' Decimal to byte conversion can overflow.
    Try
        byteVal = System.Convert.ToByte(decimalVal)
        System.Console.WriteLine("The Decimal as a byte is {0}.", _
                                  byteVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in decimal-to-byte conversion.")
    End Try
End Sub

Applies to

ToDecimal(Boolean)

Source:: Convert.cs

Source:: Convert.cs

Source:: Convert.cs

Converts the specified Boolean value to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(bool value);

public static decimal ToDecimal (bool value);

static member ToDecimal : bool -> decimal

Public Shared Function ToDecimal (value As Boolean) As Decimal

Parameters

value: Boolean

The Boolean value to convert.

Returns

Decimal

The number 1 if value is true; otherwise, 0.

Examples

The following example illustrates the conversion of Boolean to Decimal values.

bool[] flags = { true, false };
decimal result;

foreach (bool flag in flags)
{
   result = Convert.ToDecimal(flag);
   Console.WriteLine("Converted {0} to {1}.", flag, result);
}
// The example displays the following output:
//       Converted True to 1.
//       Converted False to 0.

let flags = [ true; false ]

for flag in flags do
    let result = Convert.ToDecimal flag
    printfn $"Converted {flag} to {result}."
// The example displays the following output:
//       Converted True to 1.
//       Converted False to 0.

Dim flags() As Boolean = { True, False }
Dim result As Decimal

For Each flag As Boolean In flags
   result = Convert.ToDecimal(flag)
   Console.WriteLine("Converted {0} to {1}.", flag, result)
Next
' The example displays the following output:
'       Converted True to 1.
'       Converted False to 0.

Applies to

แชร์ผ่าน

Convert.ToDecimal Method

Definition

Overloads

ToDecimal(Single)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

ToDecimal(String)

Parameters

Returns

Exceptions

Examples

Remarks

Applies to

ToDecimal(UInt16)

Parameters

Returns

Examples

See also

Applies to

ToDecimal(String, IFormatProvider)

Parameters

Returns

Exceptions

Examples

Remarks

Applies to

ToDecimal(UInt64)

Parameters

Returns

Examples

See also

Applies to

ToDecimal(Object, IFormatProvider)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

ToDecimal(SByte)

Parameters

Returns

Examples

See also

Applies to

ToDecimal(UInt32)

Parameters

Returns

Examples

See also

Applies to

ToDecimal(Object)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

ToDecimal(Int64)

Parameters

Returns

Examples

See also

Applies to

ToDecimal(Int32)

Parameters

Returns

Examples

See also

Applies to

ToDecimal(Int16)

Parameters