BitmapImage使用FileStream读取文件

            var bitmapImage = new BitmapImage();

            using (FileStream fs = new FileStream(file.FullName, FileMode.Open))

            {

                bitmapImage.BeginInit();

                bitmapImage.CacheOption = BitmapCacheOption.OnLoad;

                bitmapImage.StreamSource = fs;

                bitmapImage.EndInit();

            }

            bitmapImage.Freeze();

            var img = new Image();

            img.Source = bitmapImage;

 第二种方式：

                    byte[] buffer = File.ReadAllBytes(file.FullName);

                    img.Source = new ImageSourceConverter().ConvertFrom(buffer) as BitmapSource;

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