Base64FormattingOptions Enumeration
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: SystemAssembly: mscorlib (in mscorlib.dll)
The ToBase64CharArray and ToBase64String methods convert the value of an array of 8-bit unsigned integers to an equivalent string representation that consists of base 64 digits. The string representation can contain one or more line breaks, where a line break is defined as a carriage return character (U+000D) followed by a line feed character (U+000A).
The following code example demonstrates using the Base64FormattingOptions enumeration to break the output of the System.Convert.ToBase64String method into separate lines.
' This example demonstrates the Convert.ToBase64String() and ' Convert.FromBase64String() methods Imports System Class Sample Public Shared Sub Main() Dim inArray(255) As Byte Dim outArray(255) As Byte Dim s2 As String Dim s3 As String Dim step1 As String = "1) The input is a byte array (inArray) of arbitrary data." Dim step2 As String = "2) Convert a subarray of the input data array to a base 64 string." Dim step3 As String = "3) Convert the entire input data array to a base 64 string." Dim step4 As String = "4) The two methods in steps 2 and 3 produce the same result?: {0}" Dim step5 As String = "5) Convert the base 64 string to an output byte array (outArray)." Dim step6 As String = "6) The input and output arrays, inArray and outArray, are equal?: {0}" Dim x 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, nl) ' 1) Display an arbitrary array of input data (inArray). The data could be ' derived from user input, a file, an algorithm, etc. Console.WriteLine(step1) Console.WriteLine() For x = 0 To inArray.Length - 1 inArray(x) = CByte(x) Console.Write("{0:X2} ", inArray(x)) If (x + 1) Mod 20 = 0 Then Console.WriteLine() End If Next x Console.Write("{0}{0}", nl) ' 2) Convert a subarray of the input data to a base64 string. In this case, ' the subarray is the entire input data array. New lines (CRLF) are inserted. Console.WriteLine(step2) s2 = Convert.ToBase64String(inArray, 0, inArray.Length, _ Base64FormattingOptions.InsertLineBreaks) Console.WriteLine("{0}{1}{2}{3}", nl, ruler, s2, nl) ' 3) Convert the input data to a base64 string. In this case, the entire ' input data array is converted by default. New lines (CRLF) are inserted. Console.WriteLine(step3) s3 = Convert.ToBase64String(inArray, Base64FormattingOptions.InsertLineBreaks) ' 4) Test whether the methods in steps 2 and 3 produce the same result. Console.WriteLine(step4, s2.Equals(s3)) ' 5) Convert the base 64 string to an output array (outArray). Console.WriteLine(step5) outArray = Convert.FromBase64String(s2) ' 6) Is outArray equal to inArray? Console.WriteLine(step6, ArraysAreEqual(inArray, outArray)) 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) The input is a byte array (inArray) 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 a subarray of the input data array to a base 64 string. ' ' 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 entire input data array to a base 64 string. '4) The two methods in steps 2 and 3 produce the same result?: True '5) Convert the base 64 string to an output byte array (outArray). '6) The input and output arrays, inArray and outArray, are equal?: True '
Windows 98, Windows 2000 SP4, Windows Millennium Edition, 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.