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在ASP.NET MVC1.0中，我们在前段通常会这样做。

            $.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);
                                            });

后端我们会做这样的代码：

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

同样的代码如果放到ASP.NET MVC2中，就会报如下异常：

 [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.

解决方法，将后端代码改成如下

        public ActionResult SaveRoleResource(int roleId,Array array)
        {
            int count = RoleResourceDal.Update(roleId, array);return Json(count,JsonRequestBehavior.AllowGet);
        }

看到这里，可能您就会明白，ASP.NET MVC2中JsonRequestBehavior默认是JsonRequestBehavior.DenyGet。