Serializing Object containing BitmapImage

问题

This is a further question about this topic: How to use deserialized object? I have a Problem with some variables in my class, right now I just put [XmlIgnore] infront of the variables wich cannot be serialized, so the serialazation of the class works for now.

My class looks like this:

public class Channel : INotifyPropertyChanged
{
    public int Width { get; set; }
    public int Height { get; set; }
    [XmlIgnore]
    public BitmapImage Logo { get; set; }
    public string CurrentCoverURL { get; set; }
    [XmlIgnore]
    public SolidColorBrush Background { get; set; }
    private string name;
    public string Name
    {
        get { return name; }
        set
        {
            name = value;
            NotifyPropertyChanged("Name");
        }
    }
}

Now I somehow need to serialize the Bitmapimage and the SolidColorBrush too, so I can pass these informations to my next view.

I found a way to do this(Serialize a Bitmap in C#/.NET to XML), but this doesn't work for Windows 8 Apps. System.Drawing.Bitmap is not available in Windows 8.

Can someone help me with this issue?

Thanks!

回答1:

This helped me do the same thing. Just convert to a byte array first.

http://jamessdixon.wordpress.com/2013/10/01/handling-images-in-webapi/

You can include your image in your JSON payload like this:

public class Person
{
    public Int32 PersonId { get; set; }
    public String FirstName { get; set; }
    public byte[] Image { get; set; }
}

or you can include the imageUri in your JSON payload like this:

public class Person
{
    public Int32 PersonId { get; set; }
    public String FirstName { get; set; }
    public String ImageUri { get; set; }
}

And you can convert your bitmapimage to a byte array like this;

    public static byte[] ConvertToBytes(BitmapImage bitmapImage)
    {
        using (var ms = new MemoryStream())
        {
            var btmMap = new WriteableBitmap
                (bitmapImage.PixelWidth, bitmapImage.PixelHeight);

            // write an image into the stream
            btmMap.SaveJpeg(ms, bitmapImage.PixelWidth, bitmapImage.PixelHeight, 0, 100);

            return ms.ToArray();
        }
    }

回答2:

Your best bet is to stop serializing implementation (such as BitmapImage, SolidColorBrush, etc), are start serializing data. For example, if you want to transfer an image such as a jpg, gif, etc: a byte[] works remarkably well, and will be understood by most serializers. If you want to serialize a color - then you have various options:

an enum
an RGBA value (could be an int or a string)

etc. This will work fine on virtually any serializer and platform. Then you simply process that data in the relevant way for your target platform.

回答3:

"I found a way to do this(Serialize a Bitmap in C#/.NET to XML), but this doesn't work for Windows 8 Apps. System.Drawing.Bitmap is not available in Windows 8."

You can use the BitmapImage.StreamSource for saving/CopyTo it to a MemoryStream and converting it to a bytearray

来源：https://stackoverflow.com/questions/18459620/serializing-object-containing-bitmapimage

标签

serialization

windows-8

bitmap

xml-serialization