C#：IComparable 实现私有
我是 C# 新手，所以这可能是一个真正的转储问题：我在我的类中实现了 IComparable，并想用 NUnit 对其进行测试。但 CompareTo-Method 被标记为私有，因此无法从测试中访问。
这是什么原因？我该如何解决这个问题？
IComparable：
public class PersonHistoryItem : DateEntity,IComparable
{
...
int IComparable.CompareTo(object obj)
{
PersonHistoryItem phi = (PersonHistoryItem)obj;
return this.StartDate.CompareTo(phi.StartDate);
}
}
测试：
[TestMethod] public void TestPersonHistoryItem() { DateTime startDate = new DateTime(2001, 2, 2); DateTime endDate = new DateTime(2010, 2, 2); PersonHistoryItem phi1 = new PersonHistoryItem(startDate,endDate);PersonHistoryItem phi2 = new PersonHistoryItem(startDate, endDate); Assert.IsTrue(phi1.CompareTo(phi2)==0); }<代码>
I'm new to C# so this might be a really dump question: I implemented IComparable in my class and want to test it with NUnit. But the CompareTo-Method is marked as private and thus not accessible from the test.
What's the reason for this and how can I fix this?
The IComparable:
public class PersonHistoryItem : DateEntity,IComparable
{
...
int IComparable.CompareTo(object obj)
{
PersonHistoryItem phi = (PersonHistoryItem)obj;
return this.StartDate.CompareTo(phi.StartDate);
}
}
The test:
[TestMethod]
public void TestPersonHistoryItem() {
DateTime startDate = new DateTime(2001, 2, 2);
DateTime endDate = new DateTime(2010, 2, 2);
PersonHistoryItem phi1 = new PersonHistoryItem(startDate,endDate);
PersonHistoryItem phi2 = new PersonHistoryItem(startDate, endDate);
Assert.IsTrue(phi1.CompareTo(phi2)==0);
}
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评论（6）
它们不是私有的，它们只是显式实现。将变量声明为
IComparable应该可以解决问题：They are not private, they are just explicitly implemented. Declaring your variables as
IComparableshould solve the problem:我认为最简单的方法是使用隐式接口实现：
I think the easiest way would be to use implicit interface implementation:
您的方法使用显式接口实现。这意味着除非完成强制转换，否则接口方法不会显示在您的类上。
执行以下操作：
((IComparable)phi1).CompareTo(phi2)Your approach uses explicit interface implementation. That means that the interface methods will not show up on your class unless a cast is done.
Do this:
((IComparable)phi1).CompareTo(phi2)这里的主要问题是您显式实现了 CompareTo 方法，该方法仅允许您在将对象用作 IComparable 对象时使用它。
要纠正此问题，请将可见性指定为 public 并非“显式”实现 CompareTo 方法：
The main problem here is that you explicitly implements the CompareTo method, which only allows you to use it when you use your object as a IComparable object.
To correct the problem, specify the visibility as public and implement the CompareTo method not "explicitly" :
在 C# 中，接口不定义访问器，因此您可以将
CompareTo方法公开，并将显式接口实现从： 更改为：
In C# an interface does not define accessors, so you can make your
CompareTomethod public and change the explicit interface implementation from:To: