C# Graphic.SetValue方法代码示例

    	/// <summary>
    	/// Creates graphic elements and adds them to the graphics layer.
    	/// </summary>
    	/// <param name="layer">Graphics layer that will have features added to it.</param>
    	/// <param name="images">Dictionary of images coming from kmz content or from previous parsing</param>
		public void CreateGraphics(KmlGraphicsLayer layer, IDictionary<string, ImageBrush> images)
		{
			if (layer == null) return;

			GraphicCollection graphics = new GraphicCollection();
			UniqueValueRenderer renderer = new UniqueValueRenderer(); // dummy renderer used to create the legend items (since creation of the swatches from the symbol is not that obvious) 
			
			// Process each metadata feature in the list
			foreach (PlacemarkDescriptor feature in placemarks)
			{
				KMLStyle style = feature.Symbol.style;

				if (style.ZipFile != null)
				{
					// Look for the image in the zip file
					if (style.IconImage == null && !String.IsNullOrEmpty(style.IconHref))
					{
						style.IconImage = GetIconImage(style.ZipFile, style.IconHref.ToLower());
					}

					style.ZipFile.Dispose();
					style.ZipFile = null;
				}

                //Define handlers upfront so we can unhook from them
#if SILVERLIGHT
                EventHandler<RoutedEventArgs>
#else
                EventHandler
#endif
 imageCompleted = null;
#if SILVERLIGHT
                EventHandler<ExceptionRoutedEventArgs> 		
#else
                EventHandler<ExceptionEventArgs>
#endif
 imageFailed = null;

				// If the style has an HREF then it is associated with an image
				if (style.IconImage == null && !String.IsNullOrEmpty(style.IconHref))
				{
					// If the image is already loaded in the image dictionary, use it
					if (images.ContainsKey(style.IconHref.ToLower()))
						style.IconImage = images[style.IconHref.ToLower()];
					else
					{
						// Get the image using the HREF and store the image in the images dictionary so that if
						// other features reference it, it is cached
                        style.IconImage = GetIconImage(style.IconHref);
                        if (style.IconImage != null && (style.IconImage as ImageBrush).ImageSource != null)
							{
                            var bi = (style.IconImage as ImageBrush).ImageSource as BitmapImage;
                            if (bi != null)
                            {
                                imageFailed = (s, e) =>
                                {
                                    var b = s as BitmapImage;
#if SILVERLIGHT           
                                    if (imageCompleted != null) b.ImageOpened -= imageCompleted;
                                    if(imageFailed != null) b.ImageFailed -= imageFailed;
#else
                                    if (imageCompleted != null) b.DownloadCompleted -= imageCompleted;
                                    if (imageFailed != null) b.DownloadFailed -= imageFailed;
#endif
                                    var key = b.GetValue(BitmapImageKeyProperty) as string;
								layer.Dispatcher.BeginInvoke((Action)delegate
								{								
									UpdateGraphicsAndRenderer(layer, renderer, key);
								});
                                };

#if SILVERLIGHT                                    
                                bi.ImageFailed += imageFailed;
#else
                                bi.DownloadFailed += imageFailed;
#endif
                            }
                        }
						images.Add(style.IconHref.ToLower(), style.IconImage);
					}
				}

				// Create a new graphic from the metadata and construct the symbol using polymorphism
				Graphic g = new Graphic()
				{
					Geometry = feature.Geometry,
					Symbol = feature.Symbol.CreateSymbol(),
					TimeExtent = feature.TimeExtent
				};
				g.SetValue(FeaturePlacemarkerDescriptorProperty, feature);
				// Create legend entry
				string label;
				string description;
				GetRendererInfo(feature, style, out label, out description);

//.........这里部分代码省略.........