Question

<div id="updatePanel"> </div>

我的JS脚本：

<script type="text/javascript">

            $("#MyDropDownID").change(function () {
                $.ajax({
                    url: "@Url.Action("MyMethodToGetList","MyController")",
                    contentType: "application/json; charset=utf-8",
                    type: 'GET',
                    dataType: 'json',
                    success: function (data) {
                        loadData(data);
                    },
                    error: function (xhr, status, error) {
                        alert(error);
                    }
                });
            });

            function loadData(data) {
                var tab = $('<table class="myTable"></table>');
                var thead = $('<thead></thead>');
                thead.append('<th>Name</th>');

                tab.append(thead);
                $.each(data, function (i, val) {
                    var trow = $('<tr></tr>');
                    trow.append('<td>' + val.Name + '</td>');
                    tab.append(trow);
                });
                $("tr:odd", tab).css('background-color', '#C4C4C4');
                $("#updatePanel").html(tab);
            };
        });
    </script>

控制器：

[WebMethod]
public JsonResult MyMethodToGetList()
{
    List<T> list = Class1.ReturnListWithThisParam(1);

    return Json(list, JsonRequestBehavior.AllowGet);
}

我试图获得一个List＆lt;＆gt;使用JSON，..

我在我的方法中设置断点，它可以工作，它检索1个元素，但在浏览器中我只是失败警报，为什么？我做错了什么？

其他方式（不适用）：

<script type="text/javascript">
        $('#MyDropDownId').change(function () {
            $.getJSON('@Url.Action("MyMethodToGetList", "MyController")', function(result) {
                var ddl = $('#MyDropDownId');
                ddl.empty();
                $(result).each(function() {
                    ddl.append(
                    $('<option />', {
                        value: this.Id
                    }).html(this.Name)
                    );
                });
            });
    </script>

我试图用JSON填充我的DropDown：

@Html.DropDownListFor(x => x.MyProperty, new SelectList(Enumerable.Empty<SelectListItem>()))

我的模特：

 [MetadataType(typeof(SellerMetadata))]
 public partial class Seller
 {    
   public Seller()
    {
        this.SaleRecords = new HashSet<SaleRecord>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public string CPF { get; set; }
    public string RG { get; set; }
    public DateTime AdmissionDate { get; set; }
    public Situation Situation { get; set; }
    public Scholarity Scholarity { get; set; }
    public int DeptId { get; set; }

    public virtual Department Department { get; set; }
    public virtual ICollection<SaleRecord> SaleRecords { get; set; }
}

我在浏览器中检查过，我收到了这个错误：

System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
   em System.Web.Mvc.Controller.&lt;BeginExecute&gt;b__15(IAsyncResult asyncResult, Controller controller)
   em System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   em System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
   em System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag)
   em System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag)
   em System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult)
   em System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult)
   em System.Web.Mvc.MvcHandler.&lt;BeginProcessRequest&gt;b__5(IAsyncResult asyncResult, ProcessRequestState innerState)
   em System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   em System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
   em System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag)
   em System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag)
   em System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)
   em System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result)
   em System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   em System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously)
--&gt;

Answer 1

试试这个

     $.ajax({
                        type: 'GET',
                        url: '/yourController/yourMethod',
                        contentType: "application/json",
                        dataType: "json",
                        success: function(data) {
                      alert('success');
                        },
                        error: function() {
                            alert('fail');
                        }
                    });

public ActionResult yourMethod()
        {
          return Json("1", JsonRequestBehavior.AllowGet);
        }

Answer 2

刚发现错误：我在控制器方法中添加了它：

myContext.Configuration.ProxyCreationEnabled = false;

带MVC的JSON无效

2 个答案: