c# - 无法将参数作为 JSON 传递给 mvc Controller

Question

我试图将一个 id 和一个具有四个属性的 object 传递给 Action Controller ，但不幸的是它没有通过，我收到以下错误。

The parameters dictionary contains a null entry for parameter 'batchID' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.JsonResult GetItems(Int32, Ebiquity.Reputation.Neptune.Web.Models.MyWorkFilterModel)' in 'Ebiquity.Reputation.Neptune.Web.Controllers.MyWorkController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.

Parameter name: parameters

传递的 JSON 是:

{
    "batchID": 21610,
    "filter":
    {
        "issueNo": "1",
        "messageNo": "2",
        "itemDate": "Wed, 05 Feb 2014 00:00:00 GMT",
        "mediaName":"3"
    }
};

ajax调用:

self.GetItems = function (batchID, issueNo, messageNo, itemDate, mediaName) {

    var filter = {
        issueNo: issueNo,
        messageNo: messageNo,
        itemDate: itemDate,
        mediaName: mediaName
    };
        
    $.ajax({
        type: "GET",
        url: "/MyWork/GetItems",
        data: JSON.stringify({
            batchID: batchID,
            filter: filter
        }),
        dataType: "json",
        success: function (result) {

            self.Items([]);
            if (result.Items != null) {
                var tempItems = ko.mapping.fromJS(result.Items, mappingOptions);
                self.Items.push.apply(self.Items, tempItems());
            }
        }
    });
};

Controller :

[HttpGet]
public JsonResult GetItems(int batchID, MyWorkFilterModel filter)
{
    using (var rep = new WorkRepository(CurrentUser))
    {
        return Json(rep.GetBatch(batchID, filter), JsonRequestBehavior.AllowGet);
    }
}

过滤器模型:

public class MyWorkFilterModel
{
    public int? IssueNo { get; set; }
    public int? MessageNo { get; set; }
    public string MediaName { get; set; }
    public DateTime? ItemDate { get; set; }
}

Answer 1

您必须将 AJAX 调用的类型更改为 POST 而不是 GET。数据参数不会随 GET 请求一起发送。