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Convert::ToBase64String Method (array<Byte>)

Converts an array of 8-bit unsigned integers to its equivalent string representation that is encoded with base-64 digits.

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

static String^ ToBase64String(
	array<unsigned char>^ inArray


Type: array<System::Byte>
An array of 8-bit unsigned integers.

Return Value

Type: System::String
The string representation, in base 64, of the contents of inArray.


inArray is nullptr.

The elements of inArray are taken as a numeric value and converted to a string representation that is 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.

Important noteImportant

The ToBase64String method is designed to process a single byte array that contains all the data to be encoded. To encode data from a stream, use the System.Security.Cryptography::ToBase64Transform class.

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

   void EncodeWithString()
      FileStream^ inFile;
      array<Byte>^ binaryData;

         inFile = gcnew FileStream( inputFileName,
                                    FileAccess::Read );
         binaryData = gcnew array<Byte>((int)(inFile->Length));
         long bytesRead = inFile->Read( binaryData, 0,
                                        (int)inFile->Length );
      catch ( Exception^ exp ) 
         // Error creating stream or reading from it.
         Console::WriteLine( " {0}", exp->Message );

      // Convert the binary input into Base64 UUEncoded output.
      String^ base64String;
         base64String = Convert::ToBase64String( binaryData,
                                                 binaryData->Length );
      catch ( ArgumentNullException^ ) 
         Console::WriteLine( "Binary data array is null." );

      // Write the UUEncoded version to the output file.
      StreamWriter^ outFile;
         outFile = gcnew StreamWriter( outputFileName,
                                       Text::Encoding::ASCII );
         outFile->Write( base64String );
      catch ( Exception^ exp ) 

         // Error creating stream or writing to it.
         Console::WriteLine( " {0}", exp->Message );

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Community Additions

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