Datacontract序列化/序列化与图像 [英] Datacontract serialization/serialization with images

问题描述

我有一个带有图像的类，必须（有时）根据图像是否嵌入这一事实进行序列化/反序列化。

I have a class with an image that has to be (sometimes) serialized/deserialized according to the fact that the image is embedded or not.

[DataContract(IsReference = true)]
public class Data
{
  [DataContract(IsReference = true)]
  public class MyImage
  {

  [DataMember]
  int WidthStorage
  [DataMember]
  int HeightStorage;

  [DataMember]
  public string strImageLocation;
  [DataMember]
  public Image ImageEmbedded = new Image();<----- not working null
  public bool GetImage(Image image, int width, int height)
  {
    ...
  }

  public void SetImageFSlocation(string _strImageLocation, int _widthStorage, int _heightStorage)
  {
    ...        
  }

  public void SetImageEmbedded(string strPathFilename, int _widthStorage, int _heightStorage)
  {
    ...
  }

}

所以问题在于尽管提出

public Image ImageEmbedded = new Image();

ImageEmbedded始终为null。
所以我把它放在一个构造函数中，如

ImageEmbedded is always null. So I put it in a constructor like

[DataContract(IsReference = true)]
  public class MyImage
  {
    public MyImage()
    {
      ImageEmbedded = new Image();
    }
    ...

但是当我这样做时，我得到一个序列化错误。
那我该怎么办？
我不会将Image转换为byte []或其他。我选择了Datacontract序列化，因为我认为它可以对图像进行serilize。
谢谢

but when I do that I get a serialization error. So what have I got to do? I would NOT turn Image to byte[] or other. I have chosen Datacontract serialization for I thought that it could serilize images. Thank you

推荐答案

您的代码中存在一个主要问题：如果序列化图像，则在WPF中序列化系统.Windows.Controls.Image。所以简而言之，序列化控件是没有意义的。相反，你可能想要序列化一个 BitmapSource 但是这里再次无法序列化，所以你必须将它们转换为 byte [] 已经说过了。

There is a major problem in your code: in WPF if you serialize an Image you serialize System.Windows.Controls.Image. So in short it doesn't make sense to serialize a control. Instead you might want to serialize a BitmapSource but here again those can't be serialized so you have to turn them to byte[] as already said.

[DataMember]
public byte[] bytesBitmapEmbedded;

然后只需将其更改为BitmapSource或byte []：

and then simply change it to BitmapSource or byte[] through this:

bytesBitmapEmbedded = Converter.BitmapSource2ByteArray(bitmapSource);

或

bitmapSource = Converter.ByteArray2BitmapSource(bytesBitmapEmbedded);

with

public static class Converter
{
    public static byte[] BitmapSource2ByteArray(BitmapSource bitmap)
    {
        using (var stream = new MemoryStream())
        {
            var encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(bitmap));
            encoder.Save(stream);
            return stream.ToArray();
        }
    }

    public static BitmapSource ByteArray2BitmapSource(byte[] buffer)
    {
        using (var stream = new MemoryStream(buffer))
        {
            return BitmapFrame.Create(stream,
                BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
        }
    }
}

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