List集合去重的一种方法

    /// <summary>
    /// ComparerHelper 的摘要说明
    /// 创建人：
    /// 创建时间：2017/2/8 15:19:41
    /// </summary>
    public class ComparerHelper : IEqualityComparer<AgentOpenProductModel>
    {
        /// <summary>
        /// 比较ProductId是否相等
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <returns></returns>
        public bool Equals(AgentOpenProductModel x, AgentOpenProductModel y)
        {
            return x.ProductId == y.ProductId;
        }

        /// <summary>
        /// 返回ProductId的哈希代码
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public int GetHashCode(AgentOpenProductModel obj)
        {
            if (obj == null)
            {
                return 0;
            }

            return obj.ProductId.GetHashCode();
        }
    }

projects = projects.Distinct(new ComparerHelper()).ToList();

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