Question

所以我有一个控制器将json返回给我需要测试的视图。我已经尝试使用具有动态数据类型的反射来访问列表的子属性但我仍然得到类似于“无法投射”错误的内容。基本上我在列表中有一个列表，我想访问并验证有关但我无法访问它。有没有人在MVC4之前测试过从控制器返回的json并有建议？

代码：

// arrange
        var repositoryMock = new Mock<IEdwConsoleRepository>();
        var date = -1;
        var fromDate = DateTime.Today.AddDays(date);
        EtlTableHistory[] tableHistories =
            {
                new EtlTableHistory
                    {
                        Table = new Table(),
                        RelatedStatus = new BatchStatus(),
                        BatchId = 1
                    }
            };
        EtlBatchHistory[] batchHistories = { new EtlBatchHistory
                                             {
                                                 Status = new BatchStatus(),
                                                 TableHistories = tableHistories
                                             } };

        repositoryMock.Setup(repository => repository.GetBatchHistories(fromDate)).Returns((IEnumerable<EtlBatchHistory>)batchHistories);
        var controller = new EdwController(new Mock<IEdwSecurityService>().Object, repositoryMock.Object);

        // act
        ActionResult result = controller.BatchHistories(1);

        // assert
        Assert.IsInstanceOfType(result, typeof(JsonResult), "Result type was incorrect");
        var jsonResult = (JsonResult)result;
        var resultData = (dynamic)jsonResult.Data;
        var returnedHistories = resultData.GetType().GetProperty("batchHistories").GetValue(resultData, null);

        var returnedTableHistoriesType = returnedHistories.GetType();
        Assert.AreEqual(1, returnedTableHistoriesType.GetProperty("Count").GetValue(returnedHistories, null), "Wrong number of logs in result data");

Answer 1

以下是一个例子：

Controller:

    [HttpPost]
    public JsonResult AddNewImage(string buildingID, string desc)
    {
        ReturnArgs r = new ReturnArgs();

        if (Request.Files.Count == 0)
        {
            r.Status = 102;
            r.Message = "Oops! That image did not seem to make it!";
            return Json(r);
        }
        if (!repo.BuildingExists(buildingID))
        {
            r.Status = 101;
            r.Message = "Oops! That building can't be found!";
            return Json(r);
        }

        SaveImages(buildingID, desc);
        r.Status = 200;
        r.Message = repo.GetBuildingByID(buildingID).images.Last().ImageID;

        return Json(r);
    }

    public class ReturnArgs
    {
        public int Status { get; set; }
        public string Message { get; set; }
    }

Test:

    [TestMethod]
    public void AddNewImage_Returns_Error_On_No_File()
    {
        // Arrange
        ExtendedBuilding bld = repo.GetBuildings()[0];
        string ID = bld.Id;

        var fakeContext = new Mock<HttpContextBase>();
        var fakeRequest = new Mock<HttpRequestBase>();

        fakeContext.Setup(cont => cont.Request).Returns(fakeRequest.Object);
        fakeRequest.Setup(req => req.Files.Count).Returns(0);

        BuildingController noFileController = new BuildingController(repo);
        noFileController.ControllerContext = new ControllerContext(fakeContext.Object, new System.Web.Routing.RouteData(), noFileController);

        // Act
        var result = noFileController.AddNewImage(ID, "empty");

        ReturnArgs data = (ReturnArgs)(result as JsonResult).Data;

        // Assert
        Assert.IsTrue(data.Status == 102);
    }

在您的示例中，它在我看来问题出现在这里：

var resultData = (dynamic)jsonResult.Data;
var returnedHistories = resultData.GetType().GetProperty("batchHistories").GetValue(resultData, null);

resultData对象将是您在操作中返回的对象的确切类型。所以，如果你做了类似的事情：

List<String> list = repo.GetList();
return Json(list);

然后您的resultData将是类型：

List<String>

尝试确保使用Json（obj）函数返回Object。

Answer 2

您可以将Json反序列化为动态对象，然后询问您想要的属性

示例：

dynamic obj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);

var propertyValue = obj.MyProperty; //Ask for the right property

您可以从Nuget Json.Net包中添加Json序列化程序。

测试MVC 4 C＃Controller的JSON结果

2 个答案: