Encoding.Convert 方法

定義

命名空間:

System.Text

組件:

System.Runtime.dll

將位元組陣列從一個編碼轉換成另一個編碼。

多載

Convert(Encoding, Encoding, Byte[], Int32, Int32)	將位元組陣列中的位元組範圍從一個編碼轉換成另一個。
Convert(Encoding, Encoding, Byte[])	將整個位元組陣列從一個編碼轉換成另一個。

Convert(Encoding, Encoding, Byte[], Int32, Int32)

來源:

Encoding.cs

將位元組陣列中的位元組範圍從一個編碼轉換成另一個。

public:
 static cli::array <System::Byte> ^ Convert(System::Text::Encoding ^ srcEncoding, System::Text::Encoding ^ dstEncoding, cli::array <System::Byte> ^ bytes, int index, int count);

public static byte[] Convert (System.Text.Encoding srcEncoding, System.Text.Encoding dstEncoding, byte[] bytes, int index, int count);

static member Convert : System.Text.Encoding * System.Text.Encoding * byte[] * int * int -> byte[]

Public Shared Function Convert (srcEncoding As Encoding, dstEncoding As Encoding, bytes As Byte(), index As Integer, count As Integer) As Byte()

參數

srcEncoding

Encoding

來源陣列的編碼方式，bytes。

dstEncoding

Encoding

輸出數位的編碼方式。

bytes

Byte[]

要轉換的位元組陣列。

index

Int32

要轉換之 bytes 之第一個專案的索引。

count

Int32

要轉換的位元組數目。

傳回

Byte[]

型別 Byte 陣列，其中包含將 bytes 中位元組範圍從 srcEncoding 轉換成 dstEncoding的結果。

例外狀況

ArgumentNullException

srcEncoding null。

-或-

dstEncoding null。

-或-

bytes null。

ArgumentOutOfRangeException

index 和 count 未在位元組陣列中指定有效的範圍。

DecoderFallbackException

發生後援 （如需詳細資訊，請參閱 .NET 中的字元編碼 ）

-和-

srcEncoding。DecoderFallback 設定為 DecoderExceptionFallback。

EncoderFallbackException

發生後援 （如需詳細資訊，請參閱 .NET 中的字元編碼 ）

-和-

dstEncoding。EncoderFallback 設定為 EncoderExceptionFallback。

Convert(Encoding, Encoding, Byte[])

來源:

Encoding.cs

將整個位元組陣列從一個編碼轉換成另一個。

public:
 static cli::array <System::Byte> ^ Convert(System::Text::Encoding ^ srcEncoding, System::Text::Encoding ^ dstEncoding, cli::array <System::Byte> ^ bytes);

public static byte[] Convert (System.Text.Encoding srcEncoding, System.Text.Encoding dstEncoding, byte[] bytes);

static member Convert : System.Text.Encoding * System.Text.Encoding * byte[] -> byte[]

Public Shared Function Convert (srcEncoding As Encoding, dstEncoding As Encoding, bytes As Byte()) As Byte()

參數

srcEncoding

Encoding

bytes的編碼格式。

dstEncoding

Encoding

目標編碼格式。

bytes

Byte[]

要轉換的位元組。

傳回

Byte[]

型別 Byte 陣列，包含將 bytes 從 srcEncoding 轉換成 dstEncoding的結果。

例外狀況

ArgumentNullException

srcEncoding null。

-或-

dstEncoding null。

-或-

bytes null。

DecoderFallbackException

發生後援 （如需詳細資訊，請參閱 .NET 中的字元編碼 ）

-和-

srcEncoding。DecoderFallback 設定為 DecoderExceptionFallback。

EncoderFallbackException

發生後援 （如需詳細資訊，請參閱 .NET 中的字元編碼 ）

-和-

dstEncoding。EncoderFallback 設定為 EncoderExceptionFallback。

範例

下列範例會將 Unicode 編碼的字串轉換成 ASCII 編碼的字串。 由於 ASCII 屬性傳回的 ASCII 編碼物件會使用取代後援，而 Pi 字元不是 ASCII 字元集的一部分，因此 Pi 字元會取代為問號，如範例所示的輸出。

using namespace System;
using namespace System::Text;

int main()
{
   String^ unicodeString = "This string contains the unicode character Pi (\u03a0)";
   
   // Create two different encodings.
   Encoding^ ascii = Encoding::ASCII;
   Encoding^ unicode = Encoding::Unicode;
   
   // Convert the string into a byte array.
   array<Byte>^unicodeBytes = unicode->GetBytes( unicodeString );
   
   // Perform the conversion from one encoding to the other.
   array<Byte>^asciiBytes = Encoding::Convert( unicode, ascii, unicodeBytes );
   
   // Convert the new Byte into[] a char and[] then into a string.
   array<Char>^asciiChars = gcnew array<Char>(ascii->GetCharCount( asciiBytes, 0, asciiBytes->Length ));
   ascii->GetChars( asciiBytes, 0, asciiBytes->Length, asciiChars, 0 );
   String^ asciiString = gcnew String( asciiChars );
   
   // Display the strings created before and after the conversion.
   Console::WriteLine( "Original String*: {0}", unicodeString );
   Console::WriteLine( "Ascii converted String*: {0}", asciiString );
}
// The example displays the following output:
//    Original string: This string contains the unicode character Pi (Π)
//    Ascii converted string: This string contains the unicode character Pi (?)

using System;
using System.Text;

class Example
{
   static void Main()
   {
      string unicodeString = "This string contains the unicode character Pi (\u03a0)";

      // Create two different encodings.
      Encoding ascii = Encoding.ASCII;
      Encoding unicode = Encoding.Unicode;

      // Convert the string into a byte array.
      byte[] unicodeBytes = unicode.GetBytes(unicodeString);

      // Perform the conversion from one encoding to the other.
      byte[] asciiBytes = Encoding.Convert(unicode, ascii, unicodeBytes);
         
      // Convert the new byte[] into a char[] and then into a string.
      char[] asciiChars = new char[ascii.GetCharCount(asciiBytes, 0, asciiBytes.Length)];
      ascii.GetChars(asciiBytes, 0, asciiBytes.Length, asciiChars, 0);
      string asciiString = new string(asciiChars);

      // Display the strings created before and after the conversion.
      Console.WriteLine("Original string: {0}", unicodeString);
      Console.WriteLine("Ascii converted string: {0}", asciiString);
   }
}
// The example displays the following output:
//    Original string: This string contains the unicode character Pi (Π)
//    Ascii converted string: This string contains the unicode character Pi (?)

Imports System.Text

Class Example
   Shared Sub Main()
      Dim unicodeString As String = "This string contains the unicode character Pi (" & ChrW(&H03A0) & ")"

      ' Create two different encodings.
      Dim ascii As Encoding = Encoding.ASCII
      Dim unicode As Encoding = Encoding.Unicode

      ' Convert the string into a byte array.
      Dim unicodeBytes As Byte() = unicode.GetBytes(unicodeString)

      ' Perform the conversion from one encoding to the other.
      Dim asciiBytes As Byte() = Encoding.Convert(unicode, ascii, unicodeBytes)

      ' Convert the new byte array into a char array and then into a string.
      Dim asciiChars(ascii.GetCharCount(asciiBytes, 0, asciiBytes.Length)-1) As Char
      ascii.GetChars(asciiBytes, 0, asciiBytes.Length, asciiChars, 0)
      Dim asciiString As New String(asciiChars)

      ' Display the strings created before and after the conversion.
      Console.WriteLine("Original string: {0}", unicodeString)
      Console.WriteLine("Ascii converted string: {0}", asciiString)
   End Sub
End Class
' The example displays the following output:
'    Original string: This string contains the unicode character Pi (Π)
'    Ascii converted string: This string contains the unicode character Pi (?)