C# FeatureLayer.CreateRenderer方法代码示例

        private CIMRenderer CreateniqueValueRendererForUSHighwaysUsingDefinition(FeatureLayer featureLayer) {

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

            // color ramp
            CIMICCColorSpace colorSpace = new CIMICCColorSpace() {
                URL = "Default RGB"
            };
            
            CIMContinuousColorRamp continuousColorRamp = new CIMLinearContinuousColorRamp();
            continuousColorRamp.FromColor = CIMColor.CreateRGBColor(0, 0, 255); // yellow
            continuousColorRamp.ToColor = CIMColor.CreateRGBColor(255, 0, 0);     // red
            continuousColorRamp.ColorSpace = colorSpace;

            CIMRandomHSVColorRamp randomHSVColorRamp = new CIMRandomHSVColorRamp() {
                ColorSpace = colorSpace,
                MinAlpha = 100,
                MaxAlpha = 100,
                MinH = 0,
                MaxH = 360,
                MinS = 15,
                MaxS = 30,
                MinV = 99,
                MaxV = 100,
                Seed = 0
            };

            UniqueValueRendererDefinition uvRendererDef = new UniqueValueRendererDefinition() {
                ColorRamp = continuousColorRamp, //randomHSVColorRamp,
                UseDefaultSymbol = true,
                ValueFields = new string[] {"ROUTE_NUM"}
            };
            //Configure the Renderer using the featureLayer and the contents of the STATENAM
            //field
            return featureLayer.CreateRenderer(uvRendererDef);      
        }

        private Task ChangeUSHighwaysLayerDataConnectionAsync(FeatureLayer featureLayer, string catalogPath) {
            return QueuedTask.Run(() => {
                CIMDataConnection currentDataConnection = featureLayer.GetDataConnection();

                string connection = System.IO.Path.GetDirectoryName(catalogPath);
                string suffix = System.IO.Path.GetExtension(connection).ToLower();

                WorkspaceFactory wf = WorkspaceFactory.FileGDB;
                if (suffix == ".sde") {
                    wf = WorkspaceFactory.SDE;
                }

                string dataset = System.IO.Path.GetFileName(catalogPath);

                // provide a replace data connection method
                CIMStandardDataConnection updatedDataConnection = new CIMStandardDataConnection() {
                    WorkspaceConnectionString = new Geodatabase(connection).GetConnectionString(),
                    WorkspaceFactory = wf,
                    Dataset = dataset,
                    DatasetType = esriDatasetType.esriDTFeatureClass
                };

                featureLayer.SetDataConnection(updatedDataConnection);

                //For a RDBMS, it might look like this:
                //string connection = "C:\\Work\\temp.sde";
                //Geodatabase sde = new Geodatabase(connection);

                //// provide a replace data connection method
                //CIMStandardDataConnection updatedDataConnection = new CIMStandardDataConnection();
                //updatedDataConnection.WorkspaceConnectionString = sde.GetConnectionString();
                //updatedDataConnection.WorkspaceFactory = WorkspaceFactory.SDE;
                //updatedDataConnection.Dataset = "vtest.usa.states";
                //updatedDataConnection.DatasetType = esriDatasetType.esriDTFeatureClass;



                //// Alternatively, use Layer.FindAndReplaceWorkspacePath()
                ////Note: this will not allow changing the dataset name or workspace type
                ////
                ////string connection = "C:\\Work\\temp.sde";
                ////Geodatabase sde = new Geodatabase(connection);
                ////featureLayer.FindAndReplaceWorkspacePath(((CIMStandardDataConnection)currentDataConnection).WorkspaceConnectionString, 
                ////                        sde.GetConnectionString(), true);


                //////////////////////////////////////////////
                ////Please Read
                ////
                //ok, so at this point we have a couple of bugs at 1.1 AND 1.2.....
                //
                //#1: if you switched to a Datasource that invalidates the Renderer, the Renderer does
                //not get invalidated in the UI
                //(eg You had a UniqueValueRenderer on a Field called "CATEGORY", the new datasource
                //does NOT have that field and so the renderer is invalid).
                //
                //#2: By default, Layers are added with a permanent cache. The cache is NOT automatically
                //invalidated so data (eg in the Attribute table, on the screen for draws) does NOT get
                //Refreshed so you have to invalidate the cache manually...

                //So, Bug #1 - we arbitrarily switch the Renderer to a simple renderer as a work around for that...
                featureLayer.SetRenderer(featureLayer.CreateRenderer(new SimpleRendererDefinition()));

                //Bug #2, we manually invalidate the cache
                featureLayer.ClearDisplayCache();
            });
        }