将数据库的二进制字节转换成图片

首先读取出数据

byte[] b = drv["image"] as byte[];

用byte数组接收数据

实例化BitmapImage

BitmapImage newBitmapImage = new BitmapImage();

之后判断数据是否为空，并作处理，为空给予一个默认图片

if (b == null || b.Length <= 0)
                {
                    this.headerImg.Source = new BitmapImage(new Uri("../templet/images/defaulthead.jpg", UriKind.Relative));
                }
                else
                {
                    System.IO.MemoryStream _ImageMem = new System.IO.MemoryStream(b);
                    newBitmapImage.StreamSource = _ImageMem;
                    newBitmapImage.BeginInit();
                    newBitmapImage.StreamSource = _ImageMem;
                    newBitmapImage.EndInit();
                    this.headerImg.Source = newBitmapImage;
                }