silverlight-4.0 - Silverlight 4.0：如何将 byte[] 转换为图像？

Question

public Image Base64ToImage(string base64String)
    {
        // Convert Base64 String to byte[]
        byte[] imageBytes = Convert.FromBase64String(base64String);
        MemoryStream ms = new MemoryStream(imageBytes, 0,
          imageBytes.Length);

        // Convert byte[] to Image
        ms.Write(imageBytes, 0, imageBytes.Length);
        System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
        return image;
    }

我想将 byte[] 转换为图像，但是 Silverlight 不支持 System.Drawing.Image。有什么选择吗？

Answer 1

您需要创建一个 ImageSource 并将其分配给 Image 控件或使用 ImageBrush 在背景上进行设置。BitmapImage 位于 System.Windows.Media.Imaging 命名空间中。

        byte[] imageBytes = Convert.FromBase64String(base64String);
        using (MemoryStream ms = new MemoryStream(imageBytes, 0,
          imageBytes.Length))
        {
            BitmapImage im = new BitmapImage();
            im.SetSource(ms);
            this.imageControl.Source = im;
        }

或用于 ImageBrush

        byte[] imageBytes = Convert.FromBase64String(base64String);
        using (MemoryStream ms = new MemoryStream(imageBytes, 0,
          imageBytes.Length))
        {
            BitmapImage im = new BitmapImage();
            im.SetSource(ms);
            imageBrush.ImageSource = im;
            this.BoxBorder.Background = imageBrush;
        }

Answer 2

此代码可以将图像转换为字节 []

BitmapImage imageSource = new BitmapImage();
Stream stream = openFileDialog1.File.OpenRead();
BinaryReader binaryReader = new BinaryReader(stream);
currentImageInBytes = new byte[0];

currentImageInBytes = binaryReader.ReadBytes((int)stream.Length);
stream.Position = 0;
imageSource.SetSource(stream);

这段代码可以将 byte[] 转换为图像

public void Base64ToImage(byte[] imageBytes)
{

    using (MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
    {
        BitmapImage im = new BitmapImage();
        im.SetSource(ms);
        img.Source = im;
    }
}

Answer 3

另一种方式：

    public static BitmapImage ConvertStreamToImage(Stream stream)
    {
        BitmapImage _resultImage = new BitmapImage();

        _resultImage.SetSource(stream);

        return _resultImage;
    }

它使用这些名称空间： using System.IO; using System.Windows.Media.Imaging;