c# - How to dynamically export a chart in WPF? -


i working on generating dynamically chart , save image file (it not have shown in ui.) here code chart in wpf code.

<chart:piechart                 name="chart1"                 style="{staticresource minimalchartstyle}"                 charttitle="minimal pie chart"                 chartsubtitle="chart fixed width , height"                 selecteditem="{binding path=selecteditem, mode=twoway}" height="auto" width="auto" >             <chart:piechart.series>                 <chart:chartseries                         seriestitle="errors"                         displaymember="category"                         valuemember="number"                         itemssource="{binding path=errors}" />             </chart:piechart.series>         </chart:piechart>

.cs code like.

public observablecollection<testclass> errors { get; private set; }  public mainwindow()     {         initializecomponent();          datacontext = this;          errors = new observablecollection<testclass>();         errors.add(new testclass() { category = "globalization", number = 75 });         errors.add(new testclass() { category = "features", number = 2 });         errors.add(new testclass() { category = "contenttypes", number = 12 });         errors.add(new testclass() { category = "correctness", number = 83 });         errors.add(new testclass() { category = "best practices", number = 29 });      }

and trying method below can build chart above , save file further reference.

    public bool buildchart() {          clusteredbarchart newchart = new clusteredbarchart();          //newchart.actualwidth = 500; inaccessible         //newchart.actualheight = 400;         // t.b.d         ...         ...         newchart.datacontext = errors;          savethecharttofile(newchart);          return true;     }      public bool savethecharttofile(chartbase view)     {         size size = new size(view.actualwidth, view.actualheight);          if (size.isempty)             return false;          rendertargetbitmap result = new rendertargetbitmap((int)size.width, (int)size.height, 96, 96, pixelformats.pbgra32);          drawingvisual drawingvisual = new drawingvisual();          using (drawingcontext context = drawingvisual.renderopen())         {             context.drawrectangle(new visualbrush(view), null, new rect(new point(), size));             context.close();         }          result.render(drawingvisual);          bitmapencoder encoder = new jpegbitmapencoder();          memorystream file = new memorystream();          encoder.frames.add(bitmapframe.create(result));          encoder.save(file);          system.io.file.writeallbytes("d:\\ppp.jpeg", file.toarray());          return true;     }

it seems have explicitly create static chart in xaml specific width , height , on before use , export file. ?

try measure , arrange control before render it:

public bool savethecharttofile(chartbase view) {     size size = new size(100, 100);      rendertargetbitmap result = new rendertargetbitmap((int)size.width, (int)size.height, 96, 96, pixelformats.pbgra32);     view.measure(size);     view.arrange(new rect(size));      result.render(view);       bitmapencoder encoder = new jpegbitmapencoder();     encoder.frames.add(bitmapframe.create(result));     using (stream stm = file.create("test.jpg"))     {         encoder.save(stm);     }      return true; }

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