如果点击jqgrid自带的搜索，则向后台传递“_search”参数，和searchfield、searchoper、searchstring三个值。如下所示：
string _search = context.request.querystring["_search"];
if (_search == "true") {
string searchfield = context.request.querystring["searchfield"];
string searchoper = context.request.querystring["searchoper"];
string searchstring = httpcontext.current.server.htmldecode(context.request.querystring["searchstring"]);
if (searchstring != "") {
switch (searchfield) {
case "xqlx":
break;
case "tjrxm":
break;
case "tjrlxdh":
break;
default:
break;
}
}
}
