C# FeatureLayer.SetDefinition方法代码示例

        /// <summary>
        /// Call this method to apply symbol groups to the featureLayer - one group per value in the renderer.
        /// The first group to be added will be the first group to be drawn
        /// </summary>
        /// <param name="featureLayer"></param>
        private void SetUpSymbolLevelsForUSHighways(FeatureLayer featureLayer) {

            //All of these methods have to be called on the MCT
            if (Module1.OnUIThread)
                throw new CalledOnWrongThreadException();

            CIMBaseLayer baseLayer = featureLayer.GetDefinition();
            //We need CIMGeoFeatureLayerBase because this class controls whether or not we
            //use 'groups' (ie Pro Symbol Levels) with the renderer
            CIMGeoFeatureLayerBase geoFeatureLayer = baseLayer as CIMGeoFeatureLayerBase;

            // assume the unique value renderer was created using the CreateCIMRenderer()
            CIMUniqueValueRenderer uniqueValueRenderer = geoFeatureLayer.Renderer as CIMUniqueValueRenderer;

            CIMSymbolLayerDrawing symbolLayerDrawing = new CIMSymbolLayerDrawing();

            // This flag controls the drawing code and forces it to use defined symbol layers.
            //It must be set 'true'
            symbolLayerDrawing.UseSymbolLayerDrawing = true;

            // setup the symbol layers.
            List<CIMSymbolLayerIdentifier> symbolLayers = new List<CIMSymbolLayerIdentifier>();

            // this will be a for loop that will iterate over the unique value classes and updating the symbol in each class        
            int index = 0;
            foreach (CIMUniqueValueGroup nextGroup in uniqueValueRenderer.Groups) {
                foreach (CIMUniqueValueClass nextClass in nextGroup.Classes) {
                    CIMMultiLayerSymbol multiLayerSymbol = nextClass.Symbol.Symbol as CIMMultiLayerSymbol;
                    if (multiLayerSymbol == null) //This check probably is not needed
                        continue;
                    //Each group must be uniquely named
                    string uniqueName = "Group_" + index.ToString();
                    nextClass.Symbol.SymbolName = uniqueName;

                    for (int i = 0; i < multiLayerSymbol.SymbolLayers.Length; i++)
                        //Assign the unique name to all of the layers in the symbol
                        multiLayerSymbol.SymbolLayers[i].Name = uniqueName;

                    index++;
                    //Assign the name to a 'CIMSymbolLayerIdentifier'. This is the equivalent
                    //of a KeyValuePair in a Dictionary. The Names of each SymbolLayerIdentifier
                    //will be matched up in the renderer to a corresponding symbol (via nextClass.Symbol.SymbolName)
                    //So that each SymbolLayer is associated with a specific symbol for a specific value
                    CIMSymbolLayerIdentifier nextSymbolLayer = new CIMSymbolLayerIdentifier() {
                        SymbolReferenceName = "symbolReferenceName",
                        SymbolLayerName = uniqueName
                    };

                    symbolLayers.Add(nextSymbolLayer);
                    
                }
            }
            //This is where the symbol layers get added to the feature layer definition
            symbolLayerDrawing.SymbolLayers = symbolLayers.ToArray();
            geoFeatureLayer.SymbolLayerDrawing = symbolLayerDrawing;

            // update the featureLayer definition.
            featureLayer.SetDefinition(geoFeatureLayer as  CIMBaseLayer);
        }