private void DrawPreview()
{
if (WmsRasterLayer == null)
{
InitializeWmsRasterLayer();
}
Bitmap previewBitmap = null;
MemoryStream bitmapMemory = null;
try
{
WmsRasterLayer.Open();
WmsRasterLayer.TimeoutInSecond = 30;
WmsRasterLayer.ActiveLayerNames.Clear();
WmsRasterLayer.ActiveLayerNames.Add(SelectedLayer.Name);
MapEngine mapEngine = new MapEngine();
mapEngine.StaticLayers.Add(WmsRasterLayer);
mapEngine.CurrentExtent = WmsRasterLayer.GetBoundingBox();
previewBitmap = new Bitmap(125, 125);
mapEngine.DrawStaticLayers(previewBitmap, GeographyUnit.DecimalDegree);
bitmapMemory = new MemoryStream();
previewBitmap.Save(bitmapMemory, ImageFormat.Png);
}
catch (Exception ex)
{
GisEditor.LoggerManager.Log(LoggerLevel.Debug, ex.Message, new ExceptionInfo(ex));
Application.Current.Dispatcher.BeginInvoke(new Action(() =>
{
SendMessageBox(ex.Message, "Warning");
}));
}
finally
{
if (previewBitmap != null)
{
previewBitmap.Dispose();
}
var action = new Action(() =>
{
if (bitmapMemory == null || bitmapMemory.Length == 0)
{
PreviewSource = GetDefaultPreview();
}
else
{
PreviewSource = ToImageSource(bitmapMemory);
}
IsBusy = false;
});
if (Application.Current != null)
{
Application.Current.Dispatcher.BeginInvoke(action);
}
else
{
action();
}
}
}
