c# - MVC 核心 Controller 中的对象数组始终为 null

Question

我正在尝试使用 Frombody 属性将一个简单对象的数组发布到我的 MVC 核心 Controller ，但由于某种原因它变为 null。如果我只发布一个对象，它工作正常，这是我的代码:

$(document).ready(function() {
    var tk = new Array();

    $("#calendar").fullCalendar({

        header: {
            left: 'prevYear,prev,next,nextYear',
            center: 'title',
            right: 'month,agendaWeek,agendaDay',
        },

        defaultView: 'month',
        editable: true,
        alldayslot: false,
        selectable: true,
        slotminutes: 15,
        nextDayThreshold: "00:00:00",
        events: "/Home/FullCalendar",
        eventDrop: function(event, delta, revertFunc)
        {
            Update(event);
        },
    });

    function Update(event) {
        var datarow =
            {
                "id": event.id, 
                "start": event.start,
                "end": event.end,
            }
        tk.push(datarow);

        debugger;
        confirm(("Save changes?"))
        console.log(JSON.stringify(datarow));
        $.ajax({
            type: "post",
            dataType: 'json',
            cache: false,
            contentType: "application/json; charset=utf-8",
            data: JSON.stringify(tk),
            url: '@Url.Action("JSON", "Home")',
            success: function (data) {
                debugger;
            },
            error: function (xhr, ajaxOptions, thrownError) {
                alert(xhr.status);
                debugger;
            }
        });
    }
});

我的 Controller 类

[HttpPost]
public IActionResult UpdateTask([FromBody] List<Task_fullcal> td)
{
    // Do something
    // td is always null if passed as an array 
    //td working fine if passed as single value
}

Answer 1

我遇到了同样的问题，我花了几个小时才弄清楚。我把解决方案写在了

Pass array of objects to controller by jQuery AJAX, action data is always null in ASP.NET Core 2.2 MVC - it is working with .NET Framework 4.5

遵循以下:

---

我在 .Net Core 3.1 中工作，这对我有用:

<强>1。 Controller

尝试用[FromForm]代替[FromBody]

    [HttpPost]
    public ActionResult CreateOrdersPOSTObject([FromForm] List<T_POS_ENT_ORDER_DETIALS_Temp> prm)
    {
        //your logic...
        return Json(new { msg = "Successfully added " });
    }

<强>2。 AJAX 调用

不应使用 JSON.stringfy() 和 contentType。

            var DATA = [];
            DATA.push({ LocPrice: "12", LocProductID: "1002", discount: "0", posNumber: "1", productName: "soap", productQynt: "1" });
            DATA.push({ LocPrice: "23", LocProductID: "1003", discount: "0", posNumber: "1", productName: "shampoo", productQynt: "1" });
            DATA.push({ LocPrice: "7",LocProductID: "1004" ,discount: "0",posNumber: "2" ,productName: "sponge",productQynt: "2"});

            $.ajax({
                url: '@Url.Content("~/home/CreateOrdersPOSTObject")',
                data: { "prm": DATA },
                type: "POST",
                dataType: "json",
                async: true
            });

或者，如果您愿意，可以使用简写 $.post 来获得相同的结果

            var DATA = [];
            DATA.push({ LocPrice: "12", LocProductID: "1002", discount: "0", posNumber: "1", productName: "soap", productQynt: "1" });
            DATA.push({ LocPrice: "23", LocProductID: "1003", discount: "0", posNumber: "1", productName: "shampoo", productQynt: "1" });
            DATA.push({ LocPrice: "7",LocProductID: "1004" ,discount: "0",posNumber: "2" ,productName: "sponge",productQynt: "2"});

            $.post(
                '@Url.Content("~/home/CreateOrdersPOSTObject")',
                { "prm": DATA },
                function () {
                  alert( "success" );
                })
              .fail(function() {
                alert( "error" );
              });