Export (0) Print
Expand All
0 out of 3 rated this helpful - Rate this topic

Convert.ToBase64String Method (Byte())

Updated: June 2011

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)
Public Shared Function ToBase64String ( _
	inArray As Byte() _
) As String
Dim inArray As Byte()
Dim returnValue As String 

returnValue = Convert.ToBase64String(inArray)


Type: 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 Nothing.

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 Note:

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.

Public Sub EncodeWithString()
   Dim inFile As System.IO.FileStream
   Dim binaryData() As Byte

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

   ' Convert the binary input into Base64 UUEncoded output. 
   Dim base64String As String 
      base64String = System.Convert.ToBase64String(binaryData, _
                                                   0, _
   Catch exp As System.ArgumentNullException
      System.Console.WriteLine("Binary data array is null.")
   End Try 

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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0




June 2011

Added a note about converting data in a stream.

Customer feedback.

Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

© 2014 Microsoft. All rights reserved.