C# List<T>之distinct用法

创建继承IEqualityComparer接口的类，这个是通用的，复制直接使用，不用改任何东西：

 //创建list<T>方法distinct比较器
    public delegate bool CompareDelegate<T>(T x, T y);
    public class Compare<T> : IEqualityComparer<T>
    {
        private CompareDelegate<T> _compare;
        public Compare(CompareDelegate<T> d)
        {
            this._compare = d;
        }

        public bool Equals(T x, T y)
        {
            if (_compare != null)
            {
                return this._compare(x, y);
            }
            else
            {
                return false;
            }
        }

        public int GetHashCode(T obj)
        {
            return obj.ToString().GetHashCode();
        }
    }

调用方法(Comment是list里面装的对象)：

list.Distinct(new Compare<Comment>((x, y) => (x != null && y != null) &&(x.UserID == y.UserID))).ToList();

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