javascript - ASP.NET MVC JsonResult 返回 500

Question

我有这个 Controller 方法:

public JsonResult List(int number) {
 var list = new Dictionary <int, string> ();

 list.Add(1, "one");
 list.Add(2, "two");
 list.Add(3, "three");

 var q = (from h in list where h.Key == number select new {
  key = h.Key,
   value = h.Value
 });

 return Json(list);
}

在客户端，有这个 jQuery 脚本:

$("#radio1").click(function() {
  $.ajax({
    url: "/Home/List",
    dataType: "json",
    data: {
      number: '1'
    },
    success: function(data) {
      alert(data)
    },
    error: function(xhr) {
      alert(xhr.status)
    }
  });
});

我总是收到错误代码 500。有什么问题吗？

谢谢

Answer 1

如果您看到实际的响应，它可能会说

This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet.

您需要使用重载的 Json 构造函数来包含 JsonRequestBehavior.AllowGet 的 JsonRequestBehavior，例如:

return Json(list, JsonRequestBehavior.AllowGet);

这是它在示例代码中的样子(请注意，这也会将您的 int 更改为 string ，否则您会收到另一个错误)。

public JsonResult List(int number) {
  var list = new Dictionary<string, string>();

  list.Add("1", "one");
  list.Add("2", "two");
  list.Add("3", "three");

  var q = (from h in list
           where h.Key == number.ToString()
           select new {
             key = h.Key,
             value = h.Value
           });

  return Json(list, JsonRequestBehavior.AllowGet);
}