UTF32Encoding.GetMaxByteCount(Int32) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
計算將指定數目的字元編碼所產生的最大位元組數目。
public:
override int GetMaxByteCount(int charCount);public override int GetMaxByteCount (int charCount);override this.GetMaxByteCount : int -> intPublic Overrides Function GetMaxByteCount (charCount As Integer) As Integer參數
- charCount
- Int32
要編碼的字元數。
傳回
編碼指定字元數所產生的最大位元組數。
例外狀況
發生後援 (如需詳細資訊，請參閱 .NET 中的字元編碼)
-和-
範例
下列範例會決定編碼字串所需的位元組數目，然後編碼字串並顯示產生的位元組。
using namespace System;
using namespace System::Text;
void PrintCountsAndBytes( String^ s, Encoding^ enc );
void PrintHexBytes( array<Byte>^bytes );
int main()
{
// The characters to encode:
// 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)
// a high-surrogate value (U+D8FF)
// a low-surrogate value (U+DCFF)
String^ myStr = L"za\u0306\u01FD\u03B2\xD8FF\xDCFF";
// Create instances of different encodings.
UTF7Encoding^ u7 = gcnew UTF7Encoding;
UTF8Encoding^ u8Nobom = gcnew UTF8Encoding( false,true );
UTF8Encoding^ u8Bom = gcnew UTF8Encoding( true,true );
UTF32Encoding ^ u32Nobom = gcnew UTF32Encoding( false,false,true );
UTF32Encoding ^ u32Bom = gcnew UTF32Encoding( false,true,true );
// Get the byte counts and the bytes.
PrintCountsAndBytes( myStr, u7 );
PrintCountsAndBytes( myStr, u8Nobom );
PrintCountsAndBytes( myStr, u8Bom );
PrintCountsAndBytes( myStr, u32Nobom );
PrintCountsAndBytes( myStr, u32Bom );
}
void PrintCountsAndBytes( String^ s, Encoding^ enc )
{
// Display the name of the encoding used.
Console::Write( "{0,-25} :", enc );
// Display the exact byte count.
int iBC = enc->GetByteCount( s );
Console::Write( " {0,-3}", iBC );
// Display the maximum byte count.
int iMBC = enc->GetMaxByteCount( s->Length );
Console::Write( " {0,-3} :", iMBC );
// Get the byte order mark, if any.
array<Byte>^preamble = enc->GetPreamble();
// Combine the preamble and the encoded bytes.
array<Byte>^bytes = gcnew array<Byte>(preamble->Length + iBC);
Array::Copy( preamble, bytes, preamble->Length );
enc->GetBytes( s, 0, s->Length, bytes, preamble->Length );
// Display all the encoded bytes.
PrintHexBytes( bytes );
}
void PrintHexBytes( array<Byte>^bytes )
{
if ( (bytes == nullptr) || (bytes->Length == 0) )
Console::WriteLine( "<none>" );
else
{
for ( int i = 0; i < bytes->Length; i++ )
Console::Write( "{0:X2} ", bytes[ i ] );
Console::WriteLine();
}
}
/*
This code produces the following output.
System.Text.UTF7Encoding : 18 23 :7A 61 2B 41 77 59 42 2F 51 4F 79 32 50 2F 63 2F 77 2D
System.Text.UTF8Encoding : 12 24 :7A 61 CC 86 C7 BD CE B2 F1 8F B3 BF
System.Text.UTF8Encoding : 12 24 :EF BB BF 7A 61 CC 86 C7 BD CE B2 F1 8F B3 BF
System.Text.UTF32Encoding : 24 28 :7A 00 00 00 61 00 00 00 06 03 00 00 FD 01 00 00 B2 03 00 00 FF FC 04 00
System.Text.UTF32Encoding : 24 28 :FF FE 00 00 7A 00 00 00 61 00 00 00 06 03 00 00 FD 01 00 00 B2 03 00 00 FF FC 04 00
*/
using System;
using System.Text;
public class SamplesUTF32Encoding {
public static void Main() {
// The characters to encode:
// 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)
// a high-surrogate value (U+D8FF)
// a low-surrogate value (U+DCFF)
String myStr = "za\u0306\u01FD\u03B2\uD8FF\uDCFF";
// Create instances of different encodings.
UTF7Encoding u7 = new UTF7Encoding();
UTF8Encoding u8Nobom = new UTF8Encoding( false, true );
UTF8Encoding u8Bom = new UTF8Encoding( true, true );
UTF32Encoding u32Nobom = new UTF32Encoding( false, false, true );
UTF32Encoding u32Bom = new UTF32Encoding( false, true, true );
// Get the byte counts and the bytes.
PrintCountsAndBytes( myStr, u7 );
PrintCountsAndBytes( myStr, u8Nobom );
PrintCountsAndBytes( myStr, u8Bom );
PrintCountsAndBytes( myStr, u32Nobom );
PrintCountsAndBytes( myStr, u32Bom );
}
public static void PrintCountsAndBytes( String s, Encoding enc ) {
// Display the name of the encoding used.
Console.Write( "{0,-25} :", enc.ToString() );
// Display the exact byte count.
int iBC = enc.GetByteCount( s );
Console.Write( " {0,-3}", iBC );
// Display the maximum byte count.
int iMBC = enc.GetMaxByteCount( s.Length );
Console.Write( " {0,-3} :", iMBC );
// Get the byte order mark, if any.
byte[] preamble = enc.GetPreamble();
// Combine the preamble and the encoded bytes.
byte[] bytes = new byte[preamble.Length + iBC];
Array.Copy( preamble, bytes, preamble.Length );
enc.GetBytes( s, 0, s.Length, bytes, preamble.Length );
// Display all the encoded bytes.
PrintHexBytes( bytes );
}
public static void PrintHexBytes( byte[] bytes ) {
if (( bytes == null ) || ( bytes.Length == 0 ))
{
Console.WriteLine( "<none>" );
}
else {
for ( int i = 0; i < bytes.Length; i++ )
Console.Write( "{0:X2} ", bytes[i] );
Console.WriteLine();
}
}
}
/*
This code produces the following output.
System.Text.UTF7Encoding : 18 23 :7A 61 2B 41 77 59 42 2F 51 4F 79 32 50 2F 63 2F 77 2D
System.Text.UTF8Encoding : 12 24 :7A 61 CC 86 C7 BD CE B2 F1 8F B3 BF
System.Text.UTF8Encoding : 12 24 :EF BB BF 7A 61 CC 86 C7 BD CE B2 F1 8F B3 BF
System.Text.UTF32Encoding : 24 28 :7A 00 00 00 61 00 00 00 06 03 00 00 FD 01 00 00 B2 03 00 00 FF FC 04 00
System.Text.UTF32Encoding : 24 28 :FF FE 00 00 7A 00 00 00 61 00 00 00 06 03 00 00 FD 01 00 00 B2 03 00 00 FF FC 04 00
*/
Imports System.Text
Public Class SamplesUTF32Encoding
Public Shared Sub Main()
' The characters to encode:
' 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)
' a high-surrogate value (U+D8FF)
' a low-surrogate value (U+DCFF)
Dim myStr As String = "za" & ChrW(&H0306) & ChrW(&H01FD) & ChrW(&H03B2) & ChrW(&HD8FF) & ChrW(&HDCFF)
' Create instances of different encodings.
Dim u7 As New UTF7Encoding()
Dim u8Nobom As New UTF8Encoding(False, True)
Dim u8Bom As New UTF8Encoding(True, True)
Dim u32Nobom As New UTF32Encoding(False, False, True)
Dim u32Bom As New UTF32Encoding(False, True, True)
' Get the byte counts and the bytes.
PrintCountsAndBytes(myStr, u7)
PrintCountsAndBytes(myStr, u8Nobom)
PrintCountsAndBytes(myStr, u8Bom)
PrintCountsAndBytes(myStr, u32Nobom)
PrintCountsAndBytes(myStr, u32Bom)
End Sub
Public Shared Sub PrintCountsAndBytes(s As String, enc As Encoding)
' Display the name of the encoding used.
Console.Write("{0,-25} :", enc.ToString())
' Display the exact byte count.
Dim iBC As Integer = enc.GetByteCount(s)
Console.Write(" {0,-3}", iBC)
' Display the maximum byte count.
Dim iMBC As Integer = enc.GetMaxByteCount(s.Length)
Console.Write(" {0,-3} :", iMBC)
' Get the byte order mark, if any.
Dim preamble As Byte() = enc.GetPreamble()
' Combine the preamble and the encoded bytes.
' NOTE: In Visual Basic, arrays contain one extra element by default.
' The following line creates an array with the exact number of elements required.
Dim bytes(preamble.Length + iBC - 1) As Byte
Array.Copy(preamble, bytes, preamble.Length)
enc.GetBytes(s, 0, s.Length, bytes, preamble.Length)
' Display all the encoded bytes.
PrintHexBytes(bytes)
End Sub
Public Shared Sub PrintHexBytes(bytes() As Byte)
If bytes Is Nothing OrElse bytes.Length = 0 Then
Console.WriteLine("<none>")
Else
Dim i As Integer
For i = 0 To bytes.Length - 1
Console.Write("{0:X2} ", bytes(i))
Next i
Console.WriteLine()
End If
End Sub
End Class
'This code produces the following output.
'
'System.Text.UTF7Encoding : 18 23 :7A 61 2B 41 77 59 42 2F 51 4F 79 32 50 2F 63 2F 77 2D
'System.Text.UTF8Encoding : 12 24 :7A 61 CC 86 C7 BD CE B2 F1 8F B3 BF
'System.Text.UTF8Encoding : 12 24 :EF BB BF 7A 61 CC 86 C7 BD CE B2 F1 8F B3 BF
'System.Text.UTF32Encoding : 24 28 :7A 00 00 00 61 00 00 00 06 03 00 00 FD 01 00 00 B2 03 00 00 FF FC 04 00
'System.Text.UTF32Encoding : 24 28 :FF FE 00 00 7A 00 00 00 61 00 00 00 06 03 00 00 FD 01 00 00 B2 03 00 00 FF FC 04 00
備註
若要計算儲存所產生位元組所需的 GetBytes 確切陣列大小，請呼叫 GetByteCount 方法。 若要計算陣列大小上限，請呼叫 GetMaxByteCount 方法。 方法 GetByteCount 通常會配置較少的記憶體，而 GetMaxByteCount 方法通常執行速度較快。
GetMaxByteCount 是最差大小寫的數位，包括目前選取 EncoderFallback 的最差大小寫。 如果選擇具有可能大型字串的後援， GetMaxByteCount 可以傳回大值。
在大部分情況下，此方法會傳回小型字串的合理數位。 對於大型字串，您可能必須在使用非常大的緩衝區和攔截錯誤之間做選擇，在罕見的情況下，會超過更合理的緩衝區。 您可能也想要考慮不同的方法，並使用 GetByteCount 或 Encoder.Convert 。
GetMaxByteCount 與 沒有關聯性 GetChars 。 如果您需要與 搭配 GetChars 使用的類似函式，請使用 GetMaxCharCount 。
注意
GetMaxByteCount(N) 不一定與 相同的值 N* GetMaxByteCount(1) 。
適用於
另請參閱
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