直接在源代码：

    定义全局变量：

   int  index=0;

/// <summary>

        /// QueryTask查询多个图层。并绑定数据

        /// </summary>

        /// <param name="listUrl">图层Url集合</param>

        /// <param name="strSql">图层查询Sql</param>

        private void QueryByMultiUrl(List<string> listUrl, string strSql)

        {

            if (strSql=="")

            {

                MessageBox.Show("请输入筛选条件！

");

                return;

            }

            loadingMask.LoadMask();

            intUrlCount = listUrl.Count;

            if (intUrlCount != 0)

            {

                    string url = listUrl[index];

                    QueryTask queryTask = new QueryTask(url);

                    queryTask.Failed += QueryTask_AllFailed;

                    Query query = new Query();

                    query.ReturnGeometry = true;

                    query.Where = strSql;

                    query.OutFields.Add("*");

                    queryTask.ExecuteAsync(query);

                    queryTask.ExecuteCompleted += (sender2, args2) =>

                        {

                            QueryTask objQueryTask = sender2 as QueryTask;

                            FeatureSet pFeatureSet = objQueryTask.LastResult;

                            foreach (Graphic item in pFeatureSet)

                            {

                                xmfwxGraphicList.Add(item);

                            }

                            index++;

                            queryFun(listUrl,strSql);

                        };

            }

        }

</pre>  </div><h2><strong> queryFun（）函数：</strong></h2><div><strong></strong><pre name="code" class="csharp"> private void queryFun(List<string> listUrl, string strSql)

        {

            if (index == intUrlCount)

            {

                index = 0;

                System.Windows.Data.PagedCollectionView pageView = new System.Windows.Data.PagedCollectionView(xmfwxGraphicList);

                resultGrid.ItemsSource = pageView;

                this._grdWorkBox_Pager.Source = pageView;

                this.CtrlSearchBox.Binding(resultGrid);

                this.CtrlSearchBox.BingindTextBoxNotify(this.TxtTip, pageView);

                TextBlockExtension.SetRedText(TxtTip, xmfwxGraphicList.Count.ToString());

                TxtTip.Text = xmfwxGraphicList.Count.ToString();

                loadingMask.UnLoadMask();

                if (xmfwxGraphicList.Count <= 0)

                {

                    MessageBox.Show("没查到相关数据！

");

                }

                return;

            }

            QueryByMultiUrl(listUrl, strSql);

        }

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