SuperMap.Web.iServerJava2.QueryByCenterService.ProcessAsync C# (CSharp) Method

        public void ProcessAsync(QueryByCenterParameters parameters)
        {
            ProcessAsync(parameters, null);
        }

 private void point_DrawCompleted(object sender, DrawEventArgs e)
 {
     QueryByCenterParameters parameters = new QueryByCenterParameters
                 {
                     CenterPoint = e.Geometry.Bounds.Center,
                     Tolerance = 5,
                     MapName = "Changchun",
                     QueryParam = new QueryParam { QueryLayerParams = new List<QueryLayerParam>() { qlpVegetable } }
                 };
     QueryByCenterService query = new QueryByCenterService("http://localhost:7080/demo");
     query.ProcessAsync(parameters);
     query.Failed += (s, args) => { MessageBox.Show(args.Error.ToString()); };
     query.ProcessCompleted += new EventHandler<QueryEventArgs>(query_ProcessCompleted);
 }