Draw square throwing exception at method MapRectangle.SetShapeParameters

[DMC Helpdesk]

Hi,

I am trying to draw a sequare using the MapRectangle control.The sample I found at this post (http://www.telerik.com/community/forums/wpf/map/draw-square.aspx) is throwing exception at the highlighted line:

private void SetShapeParameters()
        {
            if (this.MapControl != null)
            {
                Rectangle rect = this.Shape as Rectangle;

                Size size = this.MapCanvas.GetPixelSize(this.Location, this.RadiusX, this.RadiusY);
                if (!double.IsNaN(size.Width) && !double.IsInfinity(size.Width))
                {
                    rect.RadiusX = size.Width;
                }

                if (!double.IsNaN(size.Height) && !double.IsInfinity(size.Height))
                {
                    rect.RadiusY = size.Height;
                }
            }
        }

The exception is "Object reference not set to an instance of an object" and it is because this.MapCanvas is null.

Any help will be highly appreciated.

Madani

[Andrey]

Hi,

We are aware of this problem in older versions of RadControls (2011 Q1 or Q2) and it has already been fixed.

In addition, the sample you use was created for older than 2011 Q1 version of map control and it contains unnecessary functionality. I have attached a modified solution which does not contain it. Also it implements a correct order for drawing rectangle and it does not cause the exception.

All the best,
Andrey Murzov
the Telerik team