c# - Serializing a class containing a WPF Brush using `DataContractSerializer` -

i have class serializing like:

using (filestream filestreamwriter = new filestream(filename, filemode.create)) {     var datacontractserializer = new datacontractserializer(typeof(classtobeserialized));     datacontractserializer.writeobject(filestreamwriter, btchartgrouplist);     filestreamwriter.close(); } 

this works fine until add property of type brush (called areabrush) classtobeserialized class. areabrush property solidbrush, lineargradientbrush or radialgradientbrush. during serialization, datacontractserializer throws:

type 'system.windows.media.matrixtransform' data contract name 'matrixtransform:http://schemas.datacontract.org/2004/07/system.windows.media' not expected. consider using datacontractresolver if using datacontractserializer or add types not known statically list of known types - example, using knowntypeattribute attribute or adding them list of known types passed serializer.

any ideas on how can work? played around brushconverter didn't have luck that.

i guess add 3 types of brushes properties hoping better solution.

edit: of vmaleev ended doing this:

        [ignoredatamember]     public brush areabrush     {         { return _areabrush; }         set         {             setproperty(ref _areabrush, value, () => areabrush);         }     }      [datamember]     public string areabrushtext     {                 {             using (stringwriter sw = new stringwriter())             {                 xamlwriter.save(areabrush, sw);                 string s = sw.tostring();                 return sw.tostring();             }         }         set         {             areabrush = (brush)xamlreader.parse(value);         }     } 

you cannot simply. recommend mark brush property [xmlignore] , serialize , deserialize separately using xamlwriter , xamlreader:

// example of writing using (var outfile = file.createtext("brush.xaml")) {     xamlwriter.save(brush, outfile); }  // example of reading using (stream s = file.openread("brush.xaml")) {     brush b = xamlreader.load(s); } 

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