为什么Assert.AreEqual（T OBJ1，TOBJ2）失败，相同的对象 [英] Why does Assert.AreEqual(T obj1, Tobj2) fail with identical objects

问题描述

我有包含几个结构类：

public class NavigationMenu
{
    public struct NavigationMenuItem
    {
        public bool Enabled { get; set; }
        public int NumberOfPendingOperations { get; set; }
    }

    public NavigationMenuItem SubmitExpenses { get; set; }
    public NavigationMenuItem ManageExpenses { get; set; }
    public NavigationMenuItem SubmitBudgets { get; set; }
    public NavigationMenuItem ManageBudgets { get; set; }
    public NavigationMenuItem AuthorizeExpenses { get; set; }
    public NavigationMenuItem ApproveExpenses { get; set; }
    public NavigationMenuItem PayExpenses { get; set; }
    public NavigationMenuItem BillExpenses { get; set; }
    public NavigationMenuItem ManageReturnedExpenses { get; set; }
    public NavigationMenuItem ManageIncompleteExpenses { get; set; }
    public NavigationMenuItem ManageOrders { get; set; }
    public NavigationMenuItem ApproveBudgets { get; set; }
    public NavigationMenuItem AdministrateSystem { get; set; }
}

在单元测试中我做一个函数调用，并比较结果：

In a unit test I make a function call and compare the results:

NavigationMenu expected = new NavigationMenu();
        expected.SubmitExpenses = new NavigationMenu.NavigationMenuItem { Enabled = true };
        expected.ManageExpenses = new NavigationMenu.NavigationMenuItem { Enabled = true };

        NavigationMenu actual = HomeControllerHelper.GetNavigationMenuByUserRole(userRole);

        Assert.AreEqual(expected, actual);

但Assert.AreEqual总是抛出AssertFailedException。对象是相同的，我已经验证了这一点使用调试器。请分享任何想法。谢谢你。

But the Assert.AreEqual always throws AssertFailedException. The objects are identical, I've verified this using debugger. Please share any ideas. Thanks.

推荐答案

调用 Assert.AreEqual（预期，预期）应该不会失败。如果你在你的问题犯了一个错误，你的意思的 Assert.AreEqual（预期，实际值）并您HomeControllerHelper.GetNavigationMenuByUserRole返回NavigationMenu的新实例，然后将调用Assert.AreEqual总是失败，原因你的类型NavigationMenu是一个类，因此引用类型，即使你设置实例相同的值的属性。

The call Assert.AreEqual(expected, expected) should not fail. If you made a mistake in your question and you meant Assert.AreEqual(expected, actual) and your HomeControllerHelper.GetNavigationMenuByUserRole returns a new instance of NavigationMenu, then will the call to Assert.AreEqual always fail, cause your type NavigationMenu is a class and therefore a reference type, even if you set the properties of the instances to the same values.

Assert.AreEqual进行相等性检查，如果两个变量指向同一个参考（亦称ReferenceEqual），而不是如果两个引用包含相同的（属性）值。

Assert.AreEqual performs an equality check if the two variables point to the same reference (aka. ReferenceEqual) and not if the two references contain the same (property) values.

您可以覆盖你的NavigationMenu的Equals方法类，以提供一个自定义实现，如果你的类的两个实例都是平等的。

You could override the Equals method of your NavigationMenu class to provide a custom implementation if two instances of your class are equal.

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