[原创]调用IList.Remove 方法失效(解决方案)

Removes the first occurrence of a specific object from the IList.

方案一
This method determines equality using the default comparer Comparer<(Of <(T>)>).Default. Comparer<(Of <(T>)>).Default checks whether type T implements System.IComparable<(Of <(T>)>) and uses that implementation, if available. If not, Comparer<(Of <(T>)>).Default checks whether type T implements System.IComparable. If type T does not implement either interface, this method uses Object.Equals.

This method is an O(n) operation, where n is Count.

其实备注中已经给我指明了解决方案."this method uses Object.Equals"

所以我们重写Object.Equals方法即可.
 

  class DemoList
    {
        private string _s;
        public DemoList() { }
        public DemoList(string _s)
        {
            this._s = _s;
        }
        public string s
        {
            get { return _s; }
            set { _s = value; }
        }
        public override bool Equals(object obj)
        {     
            if (this.s == ((DemoList)obj).s)
            {
                return true;
            }
            else
            {
                return false;
            }         
        }
    }

方案二(来源)
http://msdn2.microsoft.com/zh-cn/library/system.collections.ilist.remove(VS.85).aspx

class SimpleList : IList
{
    private object[] _contents = new object[8];
    private int _count;

    public SimpleList()
    {
        _count = 0;
    }

    // IList Members
    public int Add(object value)
    {
        if (_count < _contents.Length)
        {
            _contents[_count] = value;
            _count++;

            return (_count - 1);
        }
        else
        {
            return -1;
        }
    }

    public int IndexOf(object value)
    {
        int itemIndex = -1;
        for (int i = 0; i < Count; i++)
        {
            if (_contents[i] == value)
            {
                itemIndex = i;
                break;
            }
        }
        return itemIndex;
    }

    public void Remove(object value)
    {
        RemoveAt(IndexOf(value));
    }
    public int Count
    {
        get
        {
            return _count;
        }
    }
    public object this[int index]
    {
        get
        {
            return _contents[index];
        }
        set
        {
            _contents[index] = value;
        }
    } 
    public void Clear()
    {
        _count = 0;
    } 
   
  }