主攻ASP.NET MVC4.0之重生:ASP.NET MVC使用JSONP

原文:主攻ASP.NET MVC4.0之重生:ASP.NET MVC使用JSONP

原文地址

http://www.codeguru.com/csharp/.net/net_asp/using-jsonp-in-asp.net-mvc.htm

1.创建JsonpController

    public class JsonpController : Controller
    {
        // GET: /Jsonp/
        VoteUserRepository userrepository = new VoteUserRepository();
        [HttpGet]
        public JsonpResult GetData(int? page)
        {
            var list = userrepository.GetModelList().Where(d => d.PhotoWorkInPoll != null).Where(d => d.PhotoWork.FirstOrDefault().State == 1);
            var userlist = from c in userrepository.GetPageModelList(list, 8, page ?? 1)
                          select new { c.VoteUserID, c.UserName };
            JsonpResult result = new JsonpResult(userlist);
            return result;
        }
    }

2.创建JsonpResult

public class JsonpResult : JsonResult
    {
        object data = null;
        public JsonpResult()
        {
        }
        public JsonpResult(object data)
        {
            this.data = data;
        }

        public override void ExecuteResult(ControllerContext controllerContext)
        {
            if (controllerContext != null)
            {
                HttpResponseBase Response = controllerContext.HttpContext.Response;
                HttpRequestBase Request = controllerContext.HttpContext.Request;

                string callbackfunction = Request["callback"];
                if (string.IsNullOrEmpty(callbackfunction))
                {
                    throw new Exception("Callback function name must be provided in the request!");
                }
                Response.ContentType = "application/x-javascript";
                if (data != null)
                {
                    JavaScriptSerializer serializer = new JavaScriptSerializer();
                    Response.Write(string.Format("{0}({1});", callbackfunction, serializer.Serialize(data)));
                }
            }
        }
    }

Json数据内容地址：http://localhost:12111/Jsonp/GetData?page=1&callback=JsonCallback

格式例如如下:

JsonCallback([{"VoteUserID":1264,"UserName":"sjc196576           "},{"VoteUserID":1265,"UserName":"竹山县朱本双        "},{"VoteUserID":1266,"UserName":"qwe1725060988       "},{"VoteUserID":1267,"UserName":"堵河1982610         "},{"VoteUserID":1268,"UserName":"625297524           "},{"VoteUserID":1269,"UserName":"chen223150          "},{"VoteUserID":1270,"UserName":"1296909213          "},{"VoteUserID":1271,"UserName":"878223109           "}]);3.其他页面调用数据方法

function TestCallback () {
        $.ajax({
             type: "get",
             async: false,
             url: "http://localhost:12111/Jsonp/GetData?page=1&callback=JsonCallback",
             dataType: "jsonp",
             jsonp: "callback",
             jsonpCallback:"JsonCallback",
             success: function(json){
                 for (var i=0;i<7;i++){
                 alert(json[i].UserName);
                }
             },
             error: function(){
                alert(‘失败‘);
             }
         });
}