BitMapImage与byte[]之间的转换

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byte[]转换为bitmapimage：
public static bitmapimage bytearraytobitmapimage(byte[] bytearray)
{
bitmapimage bmp = null;

try
{
bmp = new bitmapimage();
bmp.begininit();
bmp.streamsource = new memorystream(bytearray);
bmp.endinit();
}
catch
{
bmp = null;
}

return bmp;
}
bitmapimage转换为byte[]：
public static byte[] bitmapimagetobytearray(bitmapimage bmp)
{
byte[] bytearray = null;

try
{
stream smarket = bmp.streamsource;

if (smarket != null && smarket.length > 0)
{
//很重要，因为position经常位于stream的末尾，导致下面读取到的长度为0。
smarket.position = 0;

using (binaryreader br = new binaryreader(smarket))
{
bytearray = br.readbytes((int)smarket.length);
}
}
}
catch
{
//other exception handling
}

return bytearray;