Problem with cusotm objects deserialization in UI for WinForms

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Problem with cusotm objects deserialization

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Diagram, DiagramRibbonBar, DiagramToolBox

This is a migrated thread and some comments may be shown as answers.

florian asked on 03 May 2018, 12:57 PM

Hello,

I have some problems when I try to deserialize custom objects which implements RadDiagramShape.

I have implemented a custom shape :

public class MyShape : ElementShape

{

public override GraphicsPath CreatePath(System.Drawing.Rectangle bounds)

{

GraphicsPath path = new GraphicsPath();

path.AddString("Custom", new System.Drawing.FontFamily("Arial"), 0, bounds.Width, Point.Empty, StringFormat.GenericTypographic);

return path;

}

And a custom diagramShape :

public sealed class MyDiagramShape : RadDiagramShape

{

public MyDiagramShape()

{

ShapeText = "";

ElementShape = new MyShape();

InternalElementColor = System.Drawing.Color.LightBlue;

}

I add this custom shape to my diagram:

MyDiagramShape diagramShape = new MyDiagramShape();

diagramShape.Position = new Telerik.Windows.Diagrams.Core.Point(100, 80);

radDiagram1.AddShape(diagramShape);

This works fine, and when I serialize, I get a XML like this:

<RadDiagram>

<Shapes>

<MyDiagramShape Type="WindowsFormsApplicationCustomShape.MyDiagramShape"

</Shapes>

</RadDiagram>

Problems come when I try to load this XML, object instanciated are typed as RadDiagramShape and not MyDiagramShape.

When I serialize again, the structure of the XML is like this :

<RadDiagram>

<Shapes>

<RadDiagramShape Type="Telerik.WinControls.UI.RadDiagramShape"

</Shapes>

</RadDiagram>

I don't know if it's possible to instanciate objects with their derived type like specified in the XML ?

Thanks in advance

1 Answer, 1 is accepted

answered on 04 May 2018, 08:42 AM

I have made a quick workaround.

I manually instanciate the desired shape on ShapeDeserialized event.

private void RadDiagram1OnShapeDeserialized(object sender, SerializationEventArgs<IShape> e)

{

string type = e.SerializationInfo["Type"].ToString();

RadDiagramShape radDiagramShape = (RadDiagramShape)e.Entity;

if (type == typeof(MyDiagramShape).ToString())

{

MyDiagramShape shape = new MyDiagramShape();

shape.Shape = radDiagramShape.Shape;

shape.Position = radDiagramShape.Position;

radDiagram1.AddShape(shape);

}

And I remove the redundant RadDiagramShape item

private void RadDiagram1OnItemsChanging(object sender, DiagramItemsChangingEventArgs e)

{

var addedItem = e.NewItems.FirstOrDefault();

if (addedItem != null )

{

if (addedItem.GetType() == typeof(RadDiagramShape))

{

e.Cancel = true;

}

I'm not able to work both with custom and standard shapes and it's not very elegant but at least it does the job !