实现点查询并绑定到datagrid

void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)   
        {   
            FeatureSet featureSet = args.FeatureSet;   
            if (featureSet != null && featureSet.Features.Count > 0)   
            {   
                List<QueryResultData> resultList = new List<QueryResultData>();   
                foreach (Graphic feature in featureSet.Features)   
                {   
                    resultList.Add(new QueryResultData()   
                    {   
                        POLYGON_ID = feature.Attributes["POLYGON_ID"].ToString(),   
                        CN_NAME = feature.Attributes["CN_NAME"].ToString(),   
                        CN_PY = feature.Attributes["CN_PY"].ToString(),                           
                    });   
                }   
                QueryDetailsDataGrid.ItemsSource = resultList;   
            }   
            else  
            {   
                MessageBox.Show("No features returned from query");   
            }   
        }   
        private void QueryTask_Failed(object sender, TaskFailedEventArgs args)   
        {   
            MessageBox.Show("Query execute error: " + args.Error);   
        }   
        public class QueryResultData   
        {   
            public string POLYGON_ID { get; set; }   
            public string CN_NAME { get; set; }   
            public string CN_PY { get; set; }               
        }