c# - Wrap ImageSource for Base64 image serialization -


i have wpf control contains panels images. i'm trying serialize can loaded standalone without having have images in local folder.

i know can store images base64 string , possibly load up, wrap imagesource class accept base64 string source.

i looked imagesource class bit, , believe don't know enough how works. when implement imagesource in custom wrapper class 2 methods i'm unclear on:

  1. metadata

  2. createinstancecore

i wondering if shed light on these methods, or point me in direction doesn't lead me msdn documentation.

this class wraps bitmapimage initialized base64 string property:

public class base64bitmapimage : bitmapsource {     private bitmapimage bitmap;     private string base64source;      public string base64source     {         { return base64source; }         set         {             base64source = value;             bitmap = new bitmapimage();              if (decodefailed != null)             {                 bitmap.decodefailed += decodefailed;             }              using (var stream = new memorystream(convert.frombase64string(base64source)))             {                 bitmap.begininit();                 bitmap.cacheoption = bitmapcacheoption.onload;                 bitmap.streamsource = stream;                 bitmap.endinit();             }              if (decodefailed != null)             {                 bitmap.decodefailed -= decodefailed;             }              bitmap.freeze();         }     }      public override event eventhandler<exceptioneventargs> decodefailed;      public override bool isdownloading     {         { return false; }     }      public override pixelformat format     {         { return bitmap != null ? bitmap.format : base.format; }     }      public override double dpix     {         { return bitmap != null ? bitmap.dpix : base.dpix; }     }      public override double dpiy     {         { return bitmap != null ? bitmap.dpiy : base.dpiy; }     }      public override double width     {         { return bitmap != null ? bitmap.width : base.width; }     }      public override double height     {         { return bitmap != null ? bitmap.height : base.height; }     }      public override int pixelwidth     {         { return bitmap != null ? bitmap.pixelwidth : base.pixelwidth; }     }      public override int pixelheight     {         { return bitmap != null ? bitmap.pixelheight : base.pixelheight; }     }      public override imagemetadata metadata     {         { return bitmap != null ? bitmap.metadata : base.metadata; }     }      public override void copypixels(array pixels, int stride, int offset)     {         if (bitmap != null)         {             bitmap.copypixels(pixels, stride, offset);         }     }      public override void copypixels(int32rect sourcerect, array pixels, int stride, int offset)     {         if (bitmap != null)         {             bitmap.copypixels(sourcerect, pixels, stride, offset);         }     }      public override void copypixels(int32rect sourcerect, intptr buffer, int buffersize, int stride)     {         if (bitmap != null)         {             bitmap.copypixels(sourcerect, buffer, buffersize, stride);         }     }      protected override freezable createinstancecore()     {         var instance = new base64bitmapimage();         instance.bitmap = bitmap;         instance.base64source = base64source;         return instance;     } }

it may used this:

<image>     <image.source>         <local:base64bitmapimage base64source="..."/>     </image.source> </image>

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