ASP.NET MVC2中返回Json異常的解決辦法

在ASP.NET MVC1.0中，我們在前段通常會這樣做。

            $.ajax({
                    type: "GET",
                    url: "/role/SaveRoleResource",
                    data: { roleId: roleId, array: item },
                    datatype: 'json',
                    success: function (result) {
                        alert(result);
                    },
                    error: function (result1) {
                        alert(result1);
                    }　　　　　　　　　　 });

或者

 

                 $.getJSON("/role/SaveRoleResource", { roleId: roleId, array: item },
                                            function (data) {
                                                alert(data);
                                            });

後端我們會做這樣的代碼：

        public ActionResult SaveRoleResource(int roleId,Array array)
        {
            int count = RoleResourceDal.Update(roleId, array);

            return Json(count);
        }

同樣的代碼如果放到ASP.NET MVC2中，就會報如下異常：

 [InvalidOperationException]: 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.

解決方案，將後端代碼改成如下

 

        public ActionResult SaveRoleResource(int roleId,Array array)
        {
            int count = RoleResourceDal.Update(roleId, array);

            return Json(count,JsonRequestBehavior.AllowGet);
        }

看到這裡，可能您就會明白，ASP.NET MVC2中JsonRequestBehavior預設是JsonRequestBehavior.DenyGet。