C#将一个bitmap位图通过base64编码成一个字符串
byte[] image = null;
using (FileStream filestrm = new FileStream(@"C:\mypic.bmp",FileMode.Open, FileAccess.Read))
{
	using (BinaryReader reader = new BinaryReader(filestrm))
	{
		img = new byte[reader.BaseStream.Length];
		for (int i = 0; i < reader.BaseStream.Length; i++)
		{
			img[i] = reader.ReadByte( );
		}
	}
}
string ConvertedbmpAsString = img.Base64EncodeBytes();
