Convert.ToBase64CharArray Convert.ToBase64CharArray Convert.ToBase64CharArray Convert.ToBase64CharArray Method

Definizione

Converte un subset di una matrice di interi senza segno a 8 bit in un subset equivalente di una matrice di caratteri Unicode codificati con cifre base 64.Converts a subset of an 8-bit unsigned integer array to an equivalent subset of a Unicode character array encoded with base-64 digits.

Overload

ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32)

Converte un subset di una matrice di interi senza segno a 8 bit in un subset equivalente di una matrice di caratteri Unicode codificati con cifre base 64.Converts a subset of an 8-bit unsigned integer array to an equivalent subset of a Unicode character array encoded with base-64 digits. I parametri specificano i sottoinsiemi come offset nelle matrici di input e output e il numero di elementi nella matrice di input da convertire.Parameters specify the subsets as offsets in the input and output arrays, and the number of elements in the input array to convert.

ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions)

Converte un subset di una matrice di interi senza segno a 8 bit in un subset equivalente di una matrice di caratteri Unicode codificati con cifre base 64.Converts a subset of an 8-bit unsigned integer array to an equivalent subset of a Unicode character array encoded with base-64 digits. I parametri specificano i sottoinsiemi come offset nelle matrici di input e output, il numero di elementi nella matrice di input da convertire e se vengono inserite interruzioni di riga nella matrice di output.Parameters specify the subsets as offsets in the input and output arrays, the number of elements in the input array to convert, and whether line breaks are inserted in the output array.

ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32)

Converte un subset di una matrice di interi senza segno a 8 bit in un subset equivalente di una matrice di caratteri Unicode codificati con cifre base 64.Converts a subset of an 8-bit unsigned integer array to an equivalent subset of a Unicode character array encoded with base-64 digits. I parametri specificano i sottoinsiemi come offset nelle matrici di input e output e il numero di elementi nella matrice di input da convertire.Parameters specify the subsets as offsets in the input and output arrays, and the number of elements in the input array to convert.

public:
 static int ToBase64CharArray(cli::array <System::Byte> ^ inArray, int offsetIn, int length, cli::array <char> ^ outArray, int offsetOut);
public static int ToBase64CharArray (byte[] inArray, int offsetIn, int length, char[] outArray, int offsetOut);
static member ToBase64CharArray : byte[] * int * int * char[] * int -> int
Public Shared Function ToBase64CharArray (inArray As Byte(), offsetIn As Integer, length As Integer, outArray As Char(), offsetOut As Integer) As Integer

Parametri

inArray
Byte[]

Matrice di input di interi senza segno a 8 bit.An input array of 8-bit unsigned integers.

offsetIn
Int32 Int32 Int32 Int32

Posizione all'interno di inArray.A position within inArray.

length
Int32 Int32 Int32 Int32

Numero di elementi di inArray da convertire.The number of elements of inArray to convert.

outArray
Char[]

Matrice di output di caratteri Unicode.An output array of Unicode characters.

offsetOut
Int32 Int32 Int32 Int32

Posizione all'interno di outArray.A position within outArray.

Restituisce

Un intero con segno a 32 bit contenente il numero di byte in outArray.A 32-bit signed integer containing the number of bytes in outArray.

Eccezioni

inArray o outArray è null.inArray or outArray is null.

offsetIn, offsetOut o length è negativo.offsetIn, offsetOut, or length is negative.

In alternativa-or- La somma di offsetIn e length è maggiore della lunghezza di inArray.offsetIn plus length is greater than the length of inArray.

In alternativa-or- La somma di offsetOut e del numero di elementi da restituire è maggiore della lunghezza di outArray.offsetOut plus the number of elements to return is greater than the length of outArray.

Esempi

Nell'esempio seguente viene illustrato l'utilizzo di ToBase64CharArray metodo UUencode (codifica base 64) un flusso binario, quindi Salva la codifica in un file.The following example demonstrates using the ToBase64CharArray method to UUencode (encode in base 64) a binary stream, then save the encoding to a file.

public:
   void EncodeWithCharArray()
   {
      FileStream^ inFile;
      array<Byte>^binaryData;

      try
      {
         inFile = gcnew FileStream( inputFileName,
                                    FileMode::Open,
                                    FileAccess::Read );
         binaryData = gcnew array<Byte>((int)(inFile->Length));
         long bytesRead = inFile->Read( binaryData, 0,
                                        (int)inFile->Length );
         inFile->Close();
      }
      catch ( Exception^ exp ) 
      {
         // Error creating stream or reading from it.
         Console::WriteLine( "{0}", exp->Message );
         return;
      }
      
      // Convert the binary input into Base64 UUEncoded output.
      // Each 3 Byte sequence in the source data becomes a 4 Byte
      // sequence in the character array. 
      long arrayLength = (long)((4.0 / 3.0) * binaryData->Length);
      
      // If array length is not divisible by 4, go up to the next
      // multiple of 4.
      if ( arrayLength % 4 != 0 )
      {
         arrayLength += 4 - arrayLength % 4;
      }

      array<Char>^ base64CharArray = gcnew array<Char>(arrayLength);
      try
      {
         Convert::ToBase64CharArray( binaryData,
                                     0,
                                     binaryData->Length,
                                     base64CharArray, 0 );
      }
      catch ( ArgumentNullException^ ) 
      {
         Console::WriteLine( "Binary data array is null." );
         return;
      }
      catch ( ArgumentOutOfRangeException^ ) 
      {
         Console::WriteLine( "Char Array is not large enough." );
         return;
      }
      
      // Write the UUEncoded version to the output file.
      StreamWriter^ outFile;
      try
      {
         outFile = gcnew StreamWriter( outputFileName,
                                       false,
                                       Text::Encoding::ASCII );
         outFile->Write( base64CharArray );
         outFile->Close();
      }
      catch ( Exception^ exp ) 
      {
         // Error creating stream or writing to it.
         Console::WriteLine( " {0}", exp->Message );
      }
   }
public void EncodeWithCharArray() {
   System.IO.FileStream inFile;    
   byte[]             binaryData;

   try {
      inFile = new System.IO.FileStream(inputFileName,
                                 System.IO.FileMode.Open,
                                System.IO.FileAccess.Read);
      binaryData = new Byte[inFile.Length];
      long bytesRead = inFile.Read(binaryData, 0,
                           (int) inFile.Length);
      inFile.Close();
   }
   catch (System.Exception exp) {
      // Error creating stream or reading from it.
      System.Console.WriteLine("{0}", exp.Message);
      return;
   }

   // Convert the binary input into Base64 UUEncoded output.
   // Each 3 byte sequence in the source data becomes a 4 byte
   // sequence in the character array. 
   long arrayLength = (long) ((4.0d/3.0d) * binaryData.Length);
   
   // If array length is not divisible by 4, go up to the next
   // multiple of 4.
   if (arrayLength % 4 != 0) {
      arrayLength += 4 - arrayLength % 4;
   }
   
   char[] base64CharArray = new char[arrayLength];
   try {
      System.Convert.ToBase64CharArray(binaryData, 
                               0,
                               binaryData.Length,
                               base64CharArray,
                               0);
   }
   catch (System.ArgumentNullException) {
      System.Console.WriteLine("Binary data array is null.");
      return;
   }
   catch (System.ArgumentOutOfRangeException) {
      System.Console.WriteLine("Char Array is not large enough.");
      return;
   }

   // Write the UUEncoded version to the output file.
   System.IO.StreamWriter outFile; 
   try {
      outFile = new System.IO.StreamWriter(outputFileName,
                              false,
                              System.Text.Encoding.ASCII);          
      outFile.Write(base64CharArray);
      outFile.Close();
   }
   catch (System.Exception exp) {
      // Error creating stream or writing to it.
      System.Console.WriteLine("{0}", exp.Message);
   }
}
Public Sub EncodeWithCharArray()
   Dim inFile As System.IO.FileStream
   Dim binaryData() As Byte

   Try
      inFile = New System.IO.FileStream(inputFileName, _
                                        System.IO.FileMode.Open, _
                                        System.IO.FileAccess.Read)
      ReDim binaryData(inFile.Length)
      Dim bytesRead As Long = inFile.Read(binaryData, _
                                          0, _
                                          CInt(inFile.Length))
      inFile.Close()
   Catch exp As System.Exception
      ' Error creating stream or reading from it.
      System.Console.WriteLine("{0}", exp.Message)
      Return
   End Try

   ' Convert the binary input into Base64 UUEncoded output.
   ' Each 3 byte sequence in the source data becomes a 4 byte
   ' sequence in the character array. 
   Dim arrayLength As Long 
   arrayLength = (4 / 3) * binaryData.Length
   If arrayLength Mod 4 <> 0 Then
      arrayLength = arrayLength + 4 - arrayLength Mod 4
   End If

   Dim base64CharArray(arrayLength - 1) As Char
   Try
      System.Convert.ToBase64CharArray(binaryData, _
                                       0, _
                                       binaryData.Length, _
                                       base64CharArray, 0)
   Catch exp As System.ArgumentNullException
      System.Console.WriteLine("Binary data array is null.")
      Return
   Catch exp As System.ArgumentOutOfRangeException
      System.Console.WriteLine("Char Array is not large enough.")
      Return
   End Try

   ' Write the UUEncoded version to the output file.
   Dim outFile As System.IO.StreamWriter
   Try
      outFile = New System.IO.StreamWriter(outputFileName, _
                                           False, _
                                           System.Text.Encoding.ASCII)
      outFile.Write(base64CharArray)
      outFile.Close()
   Catch exp As System.Exception
      ' Error creating stream or writing to it.
      System.Console.WriteLine("{0}", exp.Message)
   End Try
End Sub

Commenti

Il subset di length elementi del inArray a partire dalla posizione offsetInviene considerato come un valore numerico e convertito in un subset di elementi nel outArray a partire dalla posizione offsetOut.The subset of length elements of inArray starting at position offsetIn, are taken as a numeric value and converted to a subset of elements in outArray starting at position offsetOut. Il valore restituito indica il numero di elementi convertiti in outArray.The return value indicates the number of converted elements in outArray. Il subset di outArray costituito dalle cifre base 64.The subset of outArray consists of base-64 digits.

Le cifre base 64 in ordine crescente da zero sono i caratteri maiuscoli "A" a "Z", i caratteri minuscoli "a" a "z", i numeri da "0" e "9" e i simboli "+" e "/".The base-64 digits in ascending order from zero are the uppercase characters "A" to "Z", the lowercase characters "a" to "z", the numerals "0" to "9", and the symbols "+" and "/". Il carattere non significativo "=", viene usato per la spaziatura interna finale.The valueless character, "=", is used for trailing padding.

Il offset e length i parametri sono numeri con segno a 32 bit.The offset and length parameters are 32-bit signed numbers. Il offsetIn e offsetOut i parametri sono le posizioni di matrice in base zero.The offsetIn and offsetOut parameters are zero-based array positions.

Importante

Il ToBase64CharArray metodo è progettato per elaborare una matrice a singolo byte che contiene tutti i dati da codificare.The ToBase64CharArray method is designed to process a single byte array that contains all the data to be encoded. Per creare una matrice di caratteri base 64 da un flusso di byte, utilizzare il System.Security.Cryptography.ToBase64Transform classe.To create a base-64 character array from a byte stream, use the System.Security.Cryptography.ToBase64Transform class.

Vedi anche

ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions) ToBase64CharArray(Byte[], Int32, Int32, Char[], Int32, Base64FormattingOptions)

Converte un subset di una matrice di interi senza segno a 8 bit in un subset equivalente di una matrice di caratteri Unicode codificati con cifre base 64.Converts a subset of an 8-bit unsigned integer array to an equivalent subset of a Unicode character array encoded with base-64 digits. I parametri specificano i sottoinsiemi come offset nelle matrici di input e output, il numero di elementi nella matrice di input da convertire e se vengono inserite interruzioni di riga nella matrice di output.Parameters specify the subsets as offsets in the input and output arrays, the number of elements in the input array to convert, and whether line breaks are inserted in the output array.

public:
 static int ToBase64CharArray(cli::array <System::Byte> ^ inArray, int offsetIn, int length, cli::array <char> ^ outArray, int offsetOut, Base64FormattingOptions options);
[System.Runtime.InteropServices.ComVisible(false)]
public static int ToBase64CharArray (byte[] inArray, int offsetIn, int length, char[] outArray, int offsetOut, Base64FormattingOptions options);
static member ToBase64CharArray : byte[] * int * int * char[] * int * Base64FormattingOptions -> int
Public Shared Function ToBase64CharArray (inArray As Byte(), offsetIn As Integer, length As Integer, outArray As Char(), offsetOut As Integer, options As Base64FormattingOptions) As Integer

Parametri

inArray
Byte[]

Matrice di input di interi senza segno a 8 bit.An input array of 8-bit unsigned integers.

offsetIn
Int32 Int32 Int32 Int32

Posizione all'interno di inArray.A position within inArray.

length
Int32 Int32 Int32 Int32

Numero di elementi di inArray da convertire.The number of elements of inArray to convert.

outArray
Char[]

Matrice di output di caratteri Unicode.An output array of Unicode characters.

offsetOut
Int32 Int32 Int32 Int32

Posizione all'interno di outArray.A position within outArray.

options
Base64FormattingOptions Base64FormattingOptions Base64FormattingOptions Base64FormattingOptions

InsertLineBreaks per inserire un'interruzione di riga ogni 76 caratteri o None per non inserire le interruzioni di riga.InsertLineBreaks to insert a line break every 76 characters, or None to not insert line breaks.

Restituisce

Un intero con segno a 32 bit contenente il numero di byte in outArray.A 32-bit signed integer containing the number of bytes in outArray.

Eccezioni

inArray o outArray è null.inArray or outArray is null.

offsetIn, offsetOut o length è negativo.offsetIn, offsetOut, or length is negative.

In alternativa-or- La somma di offsetIn e length è maggiore della lunghezza di inArray.offsetIn plus length is greater than the length of inArray.

In alternativa-or- La somma di offsetOut e del numero di elementi da restituire è maggiore della lunghezza di outArray.offsetOut plus the number of elements to return is greater than the length of outArray.

Esempi

Nell'esempio seguente viene illustrato il ToBase64CharArray (metodo).The following example demonstrates the ToBase64CharArray method. L'input è suddiviso in gruppi di tre byte (24 bit) ogni.The input is divided into groups of three bytes (24 bits) each. Di conseguenza, ogni gruppo è costituito da quattro numeri 6 bit dove ogni numero compreso tra 0 a 63 decimale.Consequently, each group consists of four 6-bit numbers where each number ranges from decimal 0 to 63. In questo esempio sono presenti gruppi di 3 byte 85 con un byte rimanenti.In this example, there are 85 3-byte groups with one byte remaining. Il primo gruppo è costituito dai valori esadecimali 00 e 01, 02, ovvero quattro valori di bit 6 uguali a 0, 0, 4 e 2 decimale.The first group consists of the hexadecimal values 00, 01, and 02, which yield four 6-bit values equal to decimal 0, 0, 4, and 2. Questi quattro valori corrispondano per le cifre base 64 "A", "A", "E" e "C" all'inizio dell'output.Those four values correspond to the base-64 digits "A", "A", "E", and "C" at the beginning of the output.

Se non esiste un numero integrale di gruppi di 3 byte, i byte rimanenti vengono completati con zeri in modo da formare un gruppo completo.If an integral number of 3-byte groups does not exist, the remaining bytes are effectively padded with zeros to form a complete group. In questo esempio, il valore dell'ultimo byte è esadecimale FF.In this example, the value of the last byte is hexadecimal FF. I primi 6 bit sono uguali a 63 decimale, che corrisponde alla cifra base64 "/" alla fine dell'output, e il bit 2 successivi vengono riempite con zeri per produrre 48 decimale, che corrisponde alla cifra Base64, "w".The first 6 bits are equal to decimal 63, which corresponds to the base-64 digit "/" at the end of the output, and the next 2 bits are padded with zeros to yield decimal 48, which corresponds to the base-64 digit, "w". Gli ultimi due valori di bit 6 sono la spaziatura interna e corrispondono a non significativo carattere di spaziatura interna "=".The last two 6-bit values are padding and correspond to the valueless padding character, "=".

// This example demonstrates the Convert.ToBase64CharArray() and
//                               Convert.FromBase64CharArray methods
using namespace System;
bool ArraysAreEqual( array<Byte>^a1, array<Byte>^a2 );
int main()
{
   array<Byte>^byteArray1 = gcnew array<Byte>(256);
   array<Byte>^byteArray2 = gcnew array<Byte>(256);
   array<Char>^charArray = gcnew array<Char>(352);
   int charArrayLength;
   String^ nl = Environment::NewLine;
   String^ ruler1a = "         1         2         3         4";
   String^ ruler2a = "1234567890123456789012345678901234567890";
   String^ ruler3a = "----+----+----+----+----+----+----+----+";
   String^ ruler1b = "         5         6         7      ";
   String^ ruler2b = "123456789012345678901234567890123456";
   String^ ruler3b = "----+----+----+----+----+----+----+-";
   String^ ruler = String::Concat( ruler1a, ruler1b, nl, ruler2a, ruler2b, nl, ruler3a, ruler3b );
   
   // 1) Initialize and display a Byte array of arbitrary data.
   Console::WriteLine( "1) Input: A Byte array of arbitrary data.{0}", nl );
   for ( int x = 0; x < byteArray1->Length; x++ )
   {
      byteArray1[ x ] = (Byte)x;
      Console::Write( "{0:X2} ", byteArray1[ x ] );
      if ( ((x + 1) % 20) == 0 )
            Console::WriteLine();

   }
   Console::Write( "{0}{0}", nl );
   
   // 2) Convert the input Byte array to a Char array, with newlines inserted.
   charArrayLength = Convert::ToBase64CharArray( byteArray1, 0, byteArray1->Length, 
                                                 charArray, 0, 
                                                 Base64FormattingOptions::InsertLineBreaks );
   Console::WriteLine( "2) Convert the input Byte array to a Char array with newlines." );
   Console::Write( "   Output: A Char array (length = {0}). ", charArrayLength );
   Console::WriteLine( "The elements of the array are:{0}", nl );
   Console::WriteLine( ruler );
   Console::WriteLine( gcnew String( charArray ) );
   Console::WriteLine();
   
   // 3) Convert the Char array back to a Byte array.
   Console::WriteLine( "3) Convert the Char array to an output Byte array." );
   byteArray2 = Convert::FromBase64CharArray( charArray, 0, charArrayLength );
   
   // 4) Are the input and output Byte arrays equivalent?
   Console::WriteLine( "4) The output Byte array is equal to the input Byte array: {0}", ArraysAreEqual( byteArray1, byteArray2 ) );
}

bool ArraysAreEqual( array<Byte>^a1, array<Byte>^a2 )
{
   if ( a1->Length != a2->Length )
      return false;

   for ( int i = 0; i < a1->Length; i++ )
      if ( a1[ i ] != a2[ i ] )
            return false;

   return true;
}

/*
This example produces the following results:

1) Input: A Byte array of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert the input Byte array to a Char array with newlines.
   Output: A Char array (length = 352). The elements of the array are:

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the Char array to an output Byte array.
4) The output Byte array is equal to the input Byte array: True

*/
// This example demonstrates the Convert.ToBase64CharArray() and
//                               Convert.FromBase64CharArray methods

using System;

class Sample 
{
    public static void Main() 
    {
    byte[] byteArray1 = new byte[256];
    byte[] byteArray2 = new byte[256];
    char[] charArray  = new char[352];
    int charArrayLength;
    string nl = Environment.NewLine;

    string ruler1a = "         1         2         3         4";
    string ruler2a = "1234567890123456789012345678901234567890";
    string ruler3a = "----+----+----+----+----+----+----+----+";
    string ruler1b = "         5         6         7      ";
    string ruler2b = "123456789012345678901234567890123456";
    string ruler3b = "----+----+----+----+----+----+----+-";
    string ruler   = String.Concat(ruler1a, ruler1b, nl, 
                                   ruler2a, ruler2b, nl,
                                   ruler3a, ruler3b);

// 1) Initialize and display a Byte array of arbitrary data.
    Console.WriteLine("1) Input: A Byte array of arbitrary data.{0}", nl);
    for (int x = 0; x < byteArray1.Length; x++)
    {
    byteArray1[x] = (byte)x;
    Console.Write("{0:X2} ", byteArray1[x]);
    if (((x+1)%20) == 0) Console.WriteLine();
    }
    Console.Write("{0}{0}", nl);

// 2) Convert the input Byte array to a Char array, with newlines inserted.
    charArrayLength = 
        Convert.ToBase64CharArray(byteArray1, 0, byteArray1.Length, 
                                   charArray, 0, Base64FormattingOptions.InsertLineBreaks);
    Console.WriteLine("2) Convert the input Byte array to a Char array with newlines.");
    Console.Write("   Output: A Char array (length = {0}). ", charArrayLength);
    Console.WriteLine("The elements of the array are:{0}", nl);
    Console.WriteLine(ruler);
    Console.WriteLine(new String(charArray));
    Console.WriteLine();

// 3) Convert the Char array back to a Byte array.
    Console.WriteLine("3) Convert the Char array to an output Byte array.");
    byteArray2 = Convert.FromBase64CharArray(charArray, 0, charArrayLength);

// 4) Are the input and output Byte arrays equivalent?
    Console.WriteLine("4) The output Byte array is equal to the input Byte array: {0}", 
                      ArraysAreEqual(byteArray1, byteArray2));
    }

    public static bool ArraysAreEqual(byte[] a1, byte[] a2)
    {
    if (a1.Length != a2.Length) return false;
    for (int i = 0; i < a1.Length; i++)
        if (a1[i] != a2[i]) return false;
    return true;
    }
}
/*
This example produces the following results:

1) Input: A Byte array of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert the input Byte array to a Char array with newlines.
   Output: A Char array (length = 352). The elements of the array are:

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the Char array to an output Byte array.
4) The output Byte array is equal to the input Byte array: True

*/
' This example demonstrates the Convert.ToBase64CharArray() and 
'                               Convert.FromBase64CharArray methods
Class Sample
   Public Shared Sub Main()
      Dim byteArray1(255) As Byte
      Dim byteArray2(255) As Byte
      Dim charArray(351) As Char
      Dim charArrayLength As Integer
      Dim nl As String = Environment.NewLine
      
      Dim ruler1a As String = "         1         2         3         4"
      Dim ruler2a As String = "1234567890123456789012345678901234567890"
      Dim ruler3a As String = "----+----+----+----+----+----+----+----+"
      Dim ruler1b As String = "         5         6         7      "
      Dim ruler2b As String = "123456789012345678901234567890123456"
      Dim ruler3b As String = "----+----+----+----+----+----+----+-"
      Dim ruler As String = String.Concat(ruler1a, ruler1b, nl, _
                                          ruler2a, ruler2b, nl, _
                                          ruler3a, ruler3b)

      ' 1) Initialize and display a Byte array of arbitrary data.
      Console.WriteLine("1) Input: A Byte array of arbitrary data.{0}", nl)
      Dim x As Integer
      For x = 0 To byteArray1.Length - 1
         byteArray1(x) = CByte(x)
         Console.Write("{0:X2} ", byteArray1(x))
         If(x + 1) Mod 20 = 0 Then
            Console.WriteLine()
         End If
      Next x
      Console.Write("{0}{0}", nl)
      
      ' 2) Convert the input Byte array to a Char array, with newlines inserted.
      charArrayLength = Convert.ToBase64CharArray( _
                                byteArray1, 0, byteArray1.Length, _
                                charArray, 0, _
                                Base64FormattingOptions.InsertLineBreaks)
      Console.WriteLine("2) Convert the input Byte array to a Char array with newlines.")
      Console.Write("   Output: A Char array (length = {0}). ", charArrayLength)
      Console.WriteLine("The elements of the array are:{0}", nl)
      Console.WriteLine(ruler)
      Console.WriteLine(New [String](charArray))
      Console.WriteLine()
      
      ' 3) Convert the Char array back to a Byte array.
      Console.WriteLine("3) Convert the Char array to an output Byte array.")
      byteArray2 = Convert.FromBase64CharArray(charArray, 0, charArrayLength)
      
      ' 4) Are the input and output Byte arrays equivalent?
      Console.WriteLine("4) The output Byte array is equal to the input Byte array: {0}", _
                            ArraysAreEqual(byteArray1, byteArray2))
   End Sub 'Main
   
   Public Shared Function ArraysAreEqual(a1() As Byte, a2() As Byte) As Boolean
      If a1.Length <> a2.Length Then
         Return False
      End If
      Dim i As Integer
      For i = 0 To a1.Length - 1
         If a1(i) <> a2(i) Then
            Return False
         End If
      Next i
      Return True
   End Function 'ArraysAreEqual
End Class 'Sample
'
'This example produces the following results:
'
'1) Input: A Byte array of arbitrary data.
'
'00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
'14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
'28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
'3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
'50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
'64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
'78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
'8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
'A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
'B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
'C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
'DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
'F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF
'
'2) Convert the input Byte array to a Char array with newlines.
'   Output: A Char array (length = 352). The elements of the array are:
'
'         1         2         3         4         5         6         7
'1234567890123456789012345678901234567890123456789012345678901234567890123456
'----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
'OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
'cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
'q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
'5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==
'
'3) Convert the Char array to an output Byte array.
'4) The output Byte array is equal to the input Byte array: True

Commenti

Il subset di length elementi del inArray parametro a partire dalla posizione offsetInviene considerato come un valore numerico e convertito in un subset di elementi nel outArray parametro a partire dalla posizione offsetOut.The subset of length elements of the inArray parameter starting at position offsetIn, are taken as a numeric value and converted to a subset of elements in the outArray parameter starting at position offsetOut. Il valore restituito indica il numero di elementi convertiti in outArray.The return value indicates the number of converted elements in outArray. Il subset di outArray costituito dalle cifre base 64.The subset of outArray consists of base-64 digits.

Le cifre base 64 in ordine crescente da zero sono i caratteri maiuscoli "A" a "Z", i caratteri minuscoli "a" a "z", i numeri da "0" e "9" e i simboli "+" e "/".The base-64 digits in ascending order from zero are the uppercase characters "A" to "Z", the lowercase characters "a" to "z", the numerals "0" to "9", and the symbols "+" and "/". Il carattere addietro "=" viene usato per la spaziatura interna finale.The valueless character "=" is used for trailing padding.

Il offset e length i parametri sono numeri con segno a 32 bit.The offset and length parameters are 32-bit signed numbers. Il offsetIn e offsetOut i parametri sono le posizioni di matrice in base zero.The offsetIn and offsetOut parameters are zero-based array positions.

Importante

Il ToBase64CharArray metodo è progettato per elaborare una matrice a singolo byte che contiene tutti i dati da codificare.The ToBase64CharArray method is designed to process a single byte array that contains all the data to be encoded. Per creare una matrice di caratteri base 64 da un flusso di byte, utilizzare il System.Security.Cryptography.ToBase64Transform classe.To create a base-64 character array from a byte stream, use the System.Security.Cryptography.ToBase64Transform class.

Se il options parametro è impostato su InsertLineBreaks e l'output della conversione è più di 76 caratteri, viene inserita un'interruzione di riga ogni 76 caratteri.If the options parameter is set to InsertLineBreaks and the output of the conversion is longer than 76 characters, a line break is inserted every 76 characters. Un'interruzione di riga viene definita come un ritorno a capo (U+000D) seguito da una riga carattere di avanzamento (U + 000A).A line break is defined as a carriage return character (U+000D) followed by a line feed character (U+000A). Per altre informazioni, vedere l'argomento del documento RFC 2045 "Multipurpose Internet Mail Extensions", all'indirizzo https://www.rfc-editor.org/ .For more information, see RFC 2045, "Multipurpose Internet Mail Extensions", at https://www.rfc-editor.org/.

Vedi anche

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