using System;  
 using System;  
 using System.Collections.Generic;  
 using System.Configuration;  
 using System.Data;  
 using System.Linq;  
 using System.Threading.Tasks;  
 using System.Windows;  
 
 namespace FilterStyleSample  
 {  
     /// <summary>  
     /// Interaction logic for App.xaml  
     /// </summary>  
     public partial class App : Application  
     {  
     }  
 }  
 

 using System;  
 
 using System.Collections.ObjectModel;  
 using System.Windows;  
 using System.Windows.Controls;  
 using ThinkGeo.MapSuite.Core;  
 using ThinkGeo.MapSuite.WpfDesktopEdition;  
 
 namespace FilterStyleSample  
 {  
     /// <summary>  
     /// Interaction logic for MainWindow.xaml  
     /// </summary>  
     public partial class MainWindow : Window  
     {  
         private FilterStyle filterStyle;  
 
         public MainWindow()  
         {  
             InitializeComponent();  
         }  
 
         private void Window_Loaded(object sender, RoutedEventArgs e)  
         {  
             //Initialization the wpf map  
             wpfMap1.CurrentExtent = new RectangleShape(-130.5615234375, 63.193359375, -44.0771484375, 11.337890625);  
 
             wpfMap1.Overlays.Add(new WorldMapKitWmsWpfOverlay());  
 
             LayerOverlay layerOverlay = new LayerOverlay();  
             wpfMap1.Overlays.Add(layerOverlay);  
 
             //create a shapefilefeaturelayer from usstate  
             ShapeFileFeatureLayer shpLayer = new ShapeFileFeatureLayer(@"..\..\App_Data\USStates.shp");  
             layerOverlay.Layers.Add(shpLayer);  
             //add shape file columns to combobox  
             AddColumnItemsFormShapeFile(shpLayer);  
 
             //add the filter style to wpfmap  
             filterStyle = new FilterStyle();  
             filterStyle.Conditions.Add(CreateNewFilterCondition());  
             filterStyle.Styles.Add(AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(120, GeoColor.StandardColors.Red), GeoColor.SimpleColors.White));  
 
             //reset shapefile display style  
             shpLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(filterStyle);  
             shpLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
             wpfMap1.Refresh();  
         }  
 
         private void btnApply_Click(object sender, RoutedEventArgs e)  
         {  
             //change filterstyle and refresh wpfmap.  
             filterStyle.Conditions.Clear();  
             filterStyle.Conditions.Add(CreateNewFilterCondition());  
 
             wpfMap1.Refresh();  
         }  
 
         private FilterCondition CreateNewFilterCondition()  
         {  
             FilterCondition filterCondition = new FilterCondition();  
             filterCondition.ColumnName = cmbFilterColumnName.SelectedItem.ToString();  
             filterCondition.Expression = string.Format("{0} {1}", ((ComboBoxItem)cmbFilterCondition.SelectedItem).Content.ToString(), txtFilterValue.Text);  
             return filterCondition;  
         }  
 
         private void AddColumnItemsFormShapeFile(ShapeFileFeatureLayer shpLayer)  
         {  
             shpLayer.Open();  
 
             Collection<FeatureSourceColumn> columns = shpLayer.FeatureSource.GetColumns();  
             Feature feature = shpLayer.FeatureSource.GetFeatureById("2", ReturningColumnsType.AllColumns);  
 
             foreach (var column in columns)  
             {  
                 double value = 0;  
                 if (double.TryParse(feature.ColumnValues[column.ColumnName], out value))  
                 {  
                     cmbFilterColumnName.Items.Add(column.ColumnName);  
                 }  
             }  
 
             cmbFilterColumnName.SelectedItem = "POP1990";  
         }  
     }  
 }