public interface ITest
{
    int ChildCount { get; set; }
}

public class Test
{
}

public class OrderPool : ITest, Test
{
    public int ChildCount
    {
        get;
        set;
    }
}

错误说Base类测试必须来自任何接口之前。 为什么有必要先扩展类，然后实现inteface？

The error says Base class 'Test' must come before any interfaces. Why is it necessary to extend the class first and then implement the inteface?

推荐答案

由于的规范是这么说的第§17.1.2。