关于C# IList接口，有些迷惑的地方。

[lazyfish]

MSDN上描述：

public interface IList : ICollection, IEnumerable
而其中继承的一个接口ICollection却是继承了IEnumerable
public interface ICollection : IEnumerable

问题：
为什么不直接这样，还要加上IEnumerable？迷惑中……
public interface IList : ICollection

[deadshot123]

猜想、猜想。。。
ICollection实现了IEnumerable中一部分方法 有一部分没有实现 直接以空方法替代
那么IList可以多实现一些方法 比如那些空方法

[deadshot123]

翻了下MSDN
变的跟楼主一样困惑：（

[lazyfish]

自己顶一个。

[lazyfish]

郁闷，没有人知道原因吗？

[gnhao]

我想是有些东西可能没继承过来，吧。或许重写了List里要用到的IEnumerable里的东西。。。
人人认为啊，别B4

[naturalth]

class aa : IList, IEnumerable
{
#region IList 成员

public int Add(object value)
{
throw new Exception("The method or operation is not implemented.");
}

public void Clear()
{
throw new Exception("The method or operation is not implemented.");
}

public bool Contains(object value)
{
throw new Exception("The method or operation is not implemented.");
}

public int IndexOf(object value)
{
throw new Exception("The method or operation is not implemented.");
}

public void Insert(int index, object value)
{
throw new Exception("The method or operation is not implemented.");
}

public bool IsFixedSize
{
get { throw new Exception("The method or operation is not implemented."); }
}

public bool IsReadOnly
{
get { throw new Exception("The method or operation is not implemented."); }
}

public void Remove(object value)
{
throw new Exception("The method or operation is not implemented.");
}

public void RemoveAt(int index)
{
throw new Exception("The method or operation is not implemented.");
}

public object this[int index]
{
get
{
throw new Exception("The method or operation is not implemented.");
}
set
{
throw new Exception("The method or operation is not implemented.");
}
}

#endregion

#region ICollection 成员

public void CopyTo(Array array, int index)
{
throw new Exception("The method or operation is not implemented.");
}

public int Count
{
get { throw new Exception("The method or operation is not implemented."); }
}

public bool IsSynchronized
{
get { throw new Exception("The method or operation is not implemented."); }
}

public object SyncRoot
{
get { throw new Exception("The method or operation is not implemented."); }
}

#endregion

#region IEnumerable 成员

public IEnumerator GetEnumerator()
{
throw new Exception("The method or operation is not implemented.");
}

#endregion
}
这个是实现这两个接口的具体类

[lazyfish]

楼上的，不是要你搞个什么具体类。看清楚我的问题。

[zhongkeruanjian]

http://www.cnblogs.com/allenlooplee/archive/2004/11/16/64394.html

这是个很权威的解答了，仅仅为了提高代码的可读性。

[deadshot123]

thanks