WPF Image控件 Source: Byte[] ,BitmapImage 相互转换

文件转为byte[]

FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);
byte[] desBytes = new byte[fs.Length];
fs.Read(desBytes, , desBytes.Length);
fs.Close();  

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 > )
        {
            //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 = ; 

            using (BinaryReader br = new BinaryReader(sMarket))
            {
                byteArray = br.ReadBytes((int)sMarket.Length);
            }
        }
    }
    catch
    {
        //other exception handling
    }
    return byteArray;
}