Question

我正在尝试将多个表行发布到数据库中。该课程是＆＃34; PurchaseOrderDetail＆＃34;我知道我需要反序列化JSON，但我不知道如何使用异步任务IHttpActionResult方法。错误消息

{＆＃34; $ id＆＃34;：＆＃34; 1＆＃34;，＆＃34;消息＆＃34;：＆＃34;请求无效。＆＃34;，＆＃34; ModelState＆＃34;：{＆＃34; $ id＆＃34;：＆＃34; 2＆＃34;，＆＃34; newPurchaseOrderDetail＆＃34;：[＆＃34;无法反序列化当前的JSON数组（例如[1， 2,3]）类型＆＃39; TexasExterior.Models.PurchaseOrderDetail＆＃39;因为类型需要一个JSON对象（例如{\＆＃34; name \＆＃34;：\＆＃34; value \＆＃34;}）才能正确反序列化。\ r \ n要修复此错误要么更改JSON到JSON对象（例如{\＆＃34; name \＆＃34;：\＆＃34; value \＆＃34;}）或将反序列化类型更改为实现集合接口的数组或类型（例如ICollection，IList）就像可以从JSON数组反序列化的List。 JsonArrayAttribute也可以添加到类型中以强制它从JSON数组反序列化。\ r \ n路由＆＃39;＆＃39;，第1行，第1位。＆＃34;]}}

ApiController

  public async Task<IHttpActionResult> PostNewPurchaseOrderDetail([FromBody]PurchaseOrderDetail newPurchaseOrderDetail)
    {
        try
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            using (var context = new ApplicationDbContext())
            {
                context.PurchaseOrderDetails.Add(newPurchaseOrderDetail);
                await context.SaveChangesAsync();
                return CreatedAtRoute("PurchaseOrderDetailApi", new { newPurchaseOrderDetail.PurchaseOrderDetailId }, newPurchaseOrderDetail);
            }
        }
        catch (Exception ex)
        {
            return this.BadRequest(ex.Message);
        }
    }

JSON

[
    {
        "QBRFQLINESUPPLIERPARTNUMBER": "Panels",
        "QBRFQLINESUPPLIERQUOTENOTES": "Notes",
        "QBRFQGROUPCOMBINESIZES": 15,
        "QBRFQLINESUPPLIERQUOTEQTY": 150,
        "QBRFQLINESUPPLIERQUOTEUOM": "ft",
        "QBRFQLINESUPPLIERQUOTEUNITPRICE": 1542,
        "$$hashKey": "object:96"
    },
    {
        "QBRFQLINESUPPLIERPARTNUMBER": "Carpet",
        "QBRFQLINESUPPLIERQUOTENOTES": "Notes",
        "QBRFQGROUPCOMBINESIZES": 205,
        "QBRFQLINESUPPLIERQUOTEQTY": 845,
        "QBRFQLINESUPPLIERQUOTEUOM": "meter",
        "QBRFQLINESUPPLIERQUOTEUNITPRICE": 745893,
        "$$hashKey": "object:98"
    },
    {
        "QBRFQLINESUPPLIERPARTNUMBER": "Drywall",
        "QBRFQLINESUPPLIERQUOTENOTES": "Notes",
        "QBRFQGROUPCOMBINESIZES": 19,
        "QBRFQLINESUPPLIERQUOTEQTY": 45,
        "QBRFQLINESUPPLIERQUOTEUOM": "sheet",
        "QBRFQLINESUPPLIERQUOTEUNITPRICE": 8542,
        "$$hashKey": "object:100"
    }
]

角

 //Post Purchase Order Detail
$scope.newPurchaseOrderDetail = {};
$scope.newPurchaseOrderDetail.PurchaseOrderId = $scope.newPurchaseOrder.PurchaseOrderId;
$scope.newPurchaseOrderDetail.PurchaseOrderDetailId = $scope.newPurchaseOrder.PurchaseOrderId;
$scope.addPurchaseOrderDetail = function () {
    var newPurchaseOrderDetail = $scope.newPurchaseOrderDetail;
    var index = 0;
    $scope.purchaseOrderDetailArray.forEach(function (newPurchaseOrderDetail) {
        console.log('purchaseOrderDetailArray #' + (index++) + ': ' + JSON.stringify(newPurchaseOrderDetail));
    });
    var data = JSON.stringify($scope.purchaseOrderDetailArray)
    PurchaseOrderDetailPost.post(data)
        .success(function () {
            toastr.success('Success!');
        }).error(function () {
            toastr.error('Error!');
        })

};

厂

app.factory('PurchaseOrderDetailPost', function ($http) {
return {

    post: function (data) {
        return $http.post('/api/apiPurchaseOrderDetail/', data);
    }
   };
 })

更新

 public async Task<IHttpActionResult> PostNewPurchaseOrderDetail([FromBody]IEnumerable<PurchaseOrderDetail> newPurchaseOrderDetail)
    {
        try
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            using (var context = new ApplicationDbContext())
            {
                context.PurchaseOrderDetails.AddRange(newPurchaseOrderDetail);
                await context.SaveChangesAsync();
                return CreatedAtRoute("PurchaseOrderDetailApi", new { newPurchaseOrderDetail.PurchaseOrderDetailId }, newPurchaseOrderDetail);
            }
        }
        catch (Exception ex)
        {
            return this.BadRequest(ex.Message);
        }
    }

错误我知道我很接近，我不知道如何插入PurchaseOrderDetailId

return CreatedAtRoute("PurchaseOrderDetailApi", new { newPurchaseOrderDetail.PurchaseOrderDetailId }, newPurchaseOrderDetail);

Answer 1

此错误通常是因为您发布了类似

的内容

[{"foo":"bar"}]

什么时候应该发布

{"foo":"bar"}

或修改您的方法以接受您的类的数组：

public async Task<IHttpActionResult> PostNewPurchaseOrderDetail(
    [FromBody]IEnumerable<PurchaseOrderDetail> newPurchaseOrderDetails)
{
    // ...

确保您发布的JSON采用您期望的格式Fiddler。

您的代码建议您只想发布一个PurchaseOrderDetails，但您提供的JSON暗示您尝试发布多个。

您需要选择仅发布一个{...}或修改您的方法，以便它接受许多[{...}, {...}]，如上所述。

无法使用asyncTask反序列化当前的JSON数组（例如[1,2,3]）

1 个答案: