extjs4 .NET 实现文本框模糊查询

{xtype: 'combobox',fieldLabel: '需求商',id: 'companayDemand',name: 'companayDemand',store: 'TraderNews',//包含companay的store，后台json格式获得valueField: 'traderid',displayField: 'companay',typeAhead: false,hideTrigger: true,emptyText: '请选择...',minChars: 2,//输入字符长度为2时开始查询        //listConfig属性用来设置模糊查询的关键listConfig: {loadingText: '正在查询...',emptyText: '未找到相关匹配记录！',allowPaging: false,getInnerTpl: function () {                // companay为要查询的字段return '<span name="code">Ext.define('AM.store.TraderNews', {    extend: 'Ext.data.Store',    model: 'AM.model.TraderNew',    autoLoad: false,    pageSize: 1500,    //---------- add by zhangxin 2012.1.5 整体排序 start----------    remoteSort: true,    //---------- add by zhangxin 2012.1.5 整体排序 end----------    proxy: {        type: 'ajax',        api: {            read: '/Trader/JsonIndexNew'//调用TraderController里面的JsonIndexNew方法        },        reader: {            type: 'json',            root: 'data'        }    }});

进入.net的后台方 url: '/Trader/JsonIndexNew',

  public JsonResult JsonIndexNew()        {            var tradersList = dbContent.FindAll();            string searchstring = "";            if (Request["query"] != null && Request["query"].Length > 0)            {                searchstring = Request["query"];            }            var companay = from it in tradersList select new { it.traderid, it.companay };            companay = companay.Where(it => it.companay.Contains(searchstring));            return Json(new { success = true, data = companay}, JsonRequestBehavior.AllowGet);        }

实现效果