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Convert.ToBase64String Method (Byte[])

.NET Framework 2.0

Converts the value of an array of 8-bit unsigned integers to its equivalent String representation encoded with base 64 digits.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

C++

public static string ToBase64String (
	byte[] inArray
)

public static String ToBase64String (
	byte[] inArray
)

JScript

public static function ToBase64String (
	inArray : byte[]
) : String

Parameters

inArray: An array of 8-bit unsigned integers.

Return Value

The String representation, in base 64, of the contents of inArray.

Exceptions

Exception type	Condition
ArgumentNullException	inArray is a null reference (Nothing in Visual Basic).

Remarks

The elements of inArray are taken as a numeric value and converted to a String representation encoded with base 64 digits.

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 '/'. The valueless character, '=', is used for trailing padding.

Example

The following code example demonstrates using the ToBase64CharArray method to UUencode (encode in base 64) a binary stream, then save the encoding to a file.

C++

public void EncodeWithString() {
    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.
    string base64String;
    try {
         base64String = 
            System.Convert.ToBase64String(binaryData, 
                                          0,
                                          binaryData.Length);
    }
    catch (System.ArgumentNullException) {
        System.Console.WriteLine("Binary data array is null.");
        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(base64String);
        outFile.Close();
    }
    catch (System.Exception exp) {
        // Error creating stream or writing to it.
        System.Console.WriteLine("{0}", exp.Message);
    }
}

public void EncodeWithString()
{
    System.IO.FileStream inFile;
    ubyte binaryData[];

    try {
        inFile = new System.IO.FileStream(inputFileName,
                                          System.IO.FileMode.Open,
                                          System.IO.FileAccess.Read);

        binaryData = new ubyte[(int)inFile.get_Length()];

        long bytesRead = inFile.Read(binaryData,
                                     0, (int)(inFile.get_Length()));

        inFile.Close();
    }
    catch (System.Exception exp) {
        // Error creating stream or reading from it.
        System.Console.WriteLine("{0}", exp.get_Message());
        return;
    }

    // Convert the binary input into Base64 UUEncoded output.
    String base64String;

    try {
        base64String = System.Convert.ToBase64String(binaryData, 
                                                     0, binaryData.length);
    }
    catch (System.ArgumentNullException exp) {
        System.Console.WriteLine("Binary data array is null.");
        return;
    }

    // Write the UUEncoded version to the output file.
    System.IO.StreamWriter outFile;

    try {
        outFile = new System.IO.StreamWriter(
                outputFileName, false, System.Text.Encoding.get_ASCII());
        outFile.Write(base64String);
        outFile.Close();
    }
    catch (System.Exception exp) {
        // Error creating stream or writing to it.
        System.Console.WriteLine("{0}", exp.get_Message());
    }
} //EncodeWithString

Platforms

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

Version Information

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

Reference

Convert Class
Convert Members
System Namespace
Byte Structure

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