An efficient way to Base64 encode a byte array

Question

I have a byte   and I m looking for the most efficient way to base64 encode it     The problem is that the built in  Net method Convert FromBase64CharArray requires a char   as an input  and converting my byte   to a char   just to convert it again to a base64 encoded array seems pretty stupid   Is there any more direct way to do it     EDIT    I ll expaling what I want to acheive better - I have a byte   and I need to  return a new base64 encoded byte

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byte   base64EncodedStringBytes   Encoding ASCII GetBytes Convert ToBase64String binaryData

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You could use the String Convert ToBase64String byte    to encode the byte array into a base64 string  then Byte   Convert FromBase64String string  to convert the resulting string back into a byte array

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Based on your edit and comments   would this be what you re after   byte   newByteArray   UTF8Encoding UTF8 GetBytes Convert ToBase64String currentByteArray

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Byte   -  String  use     system convert tobase64string  Convert ToBase64String byte   data    String -  Byte    use     system convert frombase64string  Convert FromBase64String string data

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Here is the code to base64 encode directly to byte array  tested to be performing  -10  of  Net Implementation  but allocates half the memory       static public void testBase64EncodeToBuffer                 for  int i   1  i  lt  200    i                           prep test data             byte   testData   new byte i               for  int j   0  j  lt  i    j                  testData j     byte  j   i                   test             testBase64 testData                        static void testBase64 byte   data                if   appendBase64 data  0  data Length  false  SequenceEqual System Text Encoding ASCII GetBytes Convert ToBase64String data     throw new Exception  quot Base 64 encoding failed quot               static public byte   appendBase64 byte   data                                 int offset                                 int size                                 bool addLineBreaks   false                byte   buffer          int bufferPos   0          int requiredSize    4     size   2    3               size 76 2 for 2 line break characters             if  addLineBreaks  requiredSize    requiredSize    requiredSize   38            buffer   new byte requiredSize            UInt32 octet a          UInt32 octet b          UInt32 octet c          UInt32 triple          int lineCount   0          int sizeMod   size -  size   3              adding all data triplets         for    offset  lt  sizeMod                         octet a   data offset                 octet b   data offset                 octet c   data offset                  triple    octet a  lt  lt  0x10     octet b  lt  lt  0x08    octet c               buffer bufferPos      base64EncodingTable  triple  gt  gt  3   6   amp  0x3F               buffer bufferPos      base64EncodingTable  triple  gt  gt  2   6   amp  0x3F               buffer bufferPos      base64EncodingTable  triple  gt  gt  1   6   amp  0x3F               buffer bufferPos      base64EncodingTable  triple  gt  gt  0   6   amp  0x3F               if  addLineBreaks                                if    lineCount    19                                        buffer bufferPos      13                      buffer bufferPos      10                      lineCount   0                                                        last bytes         if  sizeMod  lt  size                        octet a   offset  lt  size   data offset       UInt32 0              octet b   offset  lt  size   data offset       UInt32 0              octet c    UInt32 0     last character is definitely padded              triple    octet a  lt  lt  0x10     octet b  lt  lt  0x08    octet c               buffer bufferPos      base64EncodingTable  triple  gt  gt  3   6   amp  0x3F               buffer bufferPos      base64EncodingTable  triple  gt  gt  2   6   amp  0x3F               buffer bufferPos      base64EncodingTable  triple  gt  gt  1   6   amp  0x3F               buffer bufferPos      base64EncodingTable  triple  gt  gt  0   6   amp  0x3F                   add padding                 sizeMod   size   3                 last character is definitely padded             buffer bufferPos - 1     byte                  if  sizeMod    1  buffer bufferPos - 2     byte                        return buffer

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public void ProcessRequest HttpContext context                string constring   ConfigurationManager ConnectionStrings  SQL Connection String   ConnectionString          SqlConnection conn   new SqlConnection constring           conn Open            SqlCommand cmd   new SqlCommand  select image1 from TestGo where TestId 1   conn           SqlDataReader dr   cmd ExecuteReader            dr Read            MemoryStream str   new MemoryStream             context Response Clear            Byte   bytes    Byte   dr 0           string d   System Text Encoding Default GetString bytes           byte   bytes2   Convert FromBase64String d             context Response Write d           Image img   Image FromStream new MemoryStream bytes2            img Save context Response OutputStream  ImageFormat Png           context Response Flush            str WriteTo context Response OutputStream           str Dispose            str Close            conn Close            context Response End

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Base64 is a way to represent bytes in a textual form  as a string   So there is no such thing as a Base64 encoded byte    You d have a base64 encoded string  which you could decode back to a byte      However  if you want to end up with a byte array  you could take the base64 encoded string and convert it to a byte array  like   string base64String   Convert ToBase64String bytes   byte   stringBytes   Encoding ASCII GetBytes base64String     This  however  makes no sense because the best way to represent a byte   as a byte    is the byte   itself

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To retrieve your image from byte to base64 string      Model property       public byte   NomineePhoto   get  set         public string NomineePhoneInBase64Str                get               if  NomineePhoto    null                  return                  return   data image png base64  Convert ToBase64String NomineePhoto                        IN view       lt img style  height 50px width 50px  src   item NomineePhoneInBase64Str    gt

[c#] An efficient way to Base64 encode a byte array?

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