Question

好吧伙计们我是MVC的新手，我正在尝试从教程中学习，我完全按照说法做了但是它让我失望

测试方法TestProject1.UnitTest1.DisplayCustomer引发异常： System.NullReferenceException：未将对象引用设置为对象的实例。当我尝试运行单元测试时

我正在按照此处的http://www.codeproject.com/Articles/259560/Learn-MVC-Model-view-controller-Step-by-Step-in-7

进行教程

以下是我的档案：

DisplayCustomer View

    Customer ID is : <%= Model.Id %>
    Customer ID is : <%= Model.CustomerCode %>
    <% if (Model.Amount >100) {%>
    This is a Previlaged Customer
    <%} else {  %>
    This is a Normal Customer
    <% } %>

填写客户视图：

    <form  action="DisplayCustomer" method = "post">
        Customer ID     : <input type="text" name="CustomerId" /></br>
        Customer Code   : <input type="text" name="CustomerCode" /></br>
        Customer Amount : <input type="text" name="CustomerAmount" /></br>
        <input type="submit" value="Click Here"/></br>
    </form>

客户模式：

public class Customer
{
    public int Id { set; get; }
    public string CustomerCode { set; get; }
    public double Amount { set; get; }
}

CustomerController

public class CustomerController : Controller
{
    //
    // GET: /Customer/

    public ActionResult Index()
    {
        return View();
    }
    public ActionResult FillCustomer()
    {
        return View();
    }
    public ActionResult DisplayCustomer()
    {
        Customer objCustomer = new Customer();
        objCustomer.Id = 10;
        objCustomer.CustomerCode = "Sparkz";
        objCustomer.Amount = 10.55;
        var myview = View(objCustomer);
        return myview;
    }

}

我的单元测试文件（UnitTest1.cs）：在这里，我尝试了注释的代码和我在下面编写的代码，但都没有工作。它始终在var customerViewViewResult / varresult

中获取null

[TestClass]
public class UnitTest1
{
   [TestMethod]
    public void DisplayCustomer()
    {
        //CustomerController obj = new CustomerController();
        //var varresult = obj.DisplayCustomer() as ViewResult;
        //Assert.AreEqual("DisplayCustomer", varresult.ViewName);

        CustomerController controller = new CustomerController();

        var customer = new Customer();

        var customerViewActionResult = controller.DisplayCustomer();
        var customerViewViewResult = customerViewActionResult as ViewResult;


        Assert.AreEqual("DisplayCustomer", customerViewViewResult.ViewName);
    }
}

Answer 1

我正在按照这里的教程

在本教程中，DisplayCustomer的返回类型为ViewResult，而不是ActionResult

// As stated in the tutorial
public ViewResult DisplayCustomer()
{
    ...
}

我无法弄清楚我的MVC单元测试代码有什么问题

1 个答案: