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 class="search-item">{companay}</span>';
		}
	},
	listeners: {
		select: function loadForm() {
			var companayId = Ext.getCmp('companayDemand').getValue();
			var addform = Ext.getCmp('addformNew');
			addform.load({
				waitMsg: '正在加载数据请稍后',
				//提示信息
				waitTitle: '提示',
				//标题
				url: '/Trader/update',
				//请求的url地址
				params: {
					id: companayId
				},
				method: 'get',//请求方式
				success: function (form, action) { 
//加载成功的处理函数                   Ext.getCmp('companayDemand').setValue(action.result.companayDemands);
				},
				failure: function (form, action) {
 //加载失败的处理函数
			Ext.Msg.alert('提示', action.result.errorInfo);
				}
			});
		}
	}
}

store里面的方法

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