UTF7Encoding.GetString(Byte[], Int32, Int32) Method
Important
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Decodes a range of bytes from a byte array into a string.
public:
override System::String ^ GetString(cli::array <System::Byte> ^ bytes, int index, int count);
public override string GetString (byte[] bytes, int index, int count);
[System.Runtime.InteropServices.ComVisible(false)]
public override string GetString (byte[] bytes, int index, int count);
override this.GetString : byte[] * int * int -> string
[<System.Runtime.InteropServices.ComVisible(false)>]
override this.GetString : byte[] * int * int -> string
Public Overrides Function GetString (bytes As Byte(), index As Integer, count As Integer) As String
- bytes
- Byte[]
The byte array containing the sequence of bytes to decode.
- index
- Int32
The index of the first byte to decode.
- count
- Int32
The number of bytes to decode.
A String containing the results of decoding the specified sequence of bytes.
- Attributes
bytes
is null
(Nothing
).
index
or count
is less than zero.
-or-
index
and count
do not denote a valid range in bytes
.
A fallback occurred (for more information, see Character Encoding in .NET).
-and-
DecoderFallback is set to DecoderExceptionFallback.
The following code example encodes a string into an array of bytes, and then decodes the bytes back into a string.
using namespace System;
using namespace System::Text;
int main()
{
// Create an instance of UTF7Encoding.
UTF7Encoding^ u7 = gcnew UTF7Encoding( true );
// Create byte arrays from the same string containing the following characters:
// Latin Small Letter Z (U+007A)
// Latin Small Letter A (U+0061)
// Combining Breve (U+0306)
// Latin Small Letter AE With Acute (U+01FD)
// Greek Small Letter Beta (U+03B2)
String^ myStr = "za\u0306\u01FD\u03B2";
// Encode the string.
array<Byte>^myBArr = gcnew array<Byte>(u7->GetByteCount( myStr ));
u7->GetBytes( myStr, 0, myStr->Length, myBArr, 0 );
// Decode the byte array.
Console::WriteLine( "The new string is: {0}", u7->GetString( myBArr, 0, myBArr->Length ) );
}
/*
This code produces the following output. The question marks take the place of characters that cannot be displayed at the console.
The new string is: za??
*/
using System;
using System.Text;
public class SamplesUTF7Encoding {
public static void Main() {
// Create an instance of UTF7Encoding.
UTF7Encoding u7 = new UTF7Encoding( true );
// Create byte arrays from the same string containing the following characters:
// Latin Small Letter Z (U+007A)
// Latin Small Letter A (U+0061)
// Combining Breve (U+0306)
// Latin Small Letter AE With Acute (U+01FD)
// Greek Small Letter Beta (U+03B2)
String myStr = "za\u0306\u01FD\u03B2";
// Encode the string.
byte[] myBArr = new byte[u7.GetByteCount( myStr )];
u7.GetBytes( myStr, 0, myStr.Length, myBArr, 0 );
// Decode the byte array.
Console.WriteLine( "The new string is: {0}", u7.GetString( myBArr, 0, myBArr.Length ) );
}
}
/*
This code produces the following output. The question marks take the place of characters that cannot be displayed at the console.
The new string is: za??
*/
Imports System.Text
Public Class SamplesUTF7Encoding
Public Shared Sub Main()
' Create an instance of UTF7Encoding.
Dim u7 As New UTF7Encoding(True)
' Create byte arrays from the same string containing the following characters:
' Latin Small Letter Z (U+007A)
' Latin Small Letter A (U+0061)
' Combining Breve (U+0306)
' Latin Small Letter AE With Acute (U+01FD)
' Greek Small Letter Beta (U+03B2)
Dim myStr As String = "za" & ChrW(&H0306) & ChrW(&H01FD) & ChrW(&H03B2)
' Encode the string.
Dim myBArr(u7.GetByteCount(myStr)) As Byte
u7.GetBytes(myStr, 0, myStr.Length, myBArr, 0)
' Decode the byte array.
Console.WriteLine("The new string is: {0}", u7.GetString(myBArr, 0, myBArr.Length))
End Sub
End Class
'This code produces the following output. The question marks take the place of characters that cannot be displayed at the console.
'
'The new string is: za??ß
Data to be converted, such as data read from a stream, might be available only in sequential blocks. In this case, or if the amount of data is so large that it needs to be divided into smaller blocks, the application should use the Decoder or the Encoder provided by the GetDecoder method or the GetEncoder method, respectively.
Note
UTF7Encoding does not provide error detection. When invalid bytes are encountered, UTF7Encoding generally emits the invalid bytes. If a byte is larger than hexadecimal 0x7F, the byte value is zero-extended into a Unicode character, the result is stored in the chars
array, and any shift sequence is terminated. For example, if the byte to encode is hexadecimal 0x81, the resulting character is U+0081. For security reasons, your applications are recommended to use UTF8Encoding, UnicodeEncoding, or UTF32Encoding and enable error detection.
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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