linq判断一个枚举的Name是否存在

比如，枚举如下：

    [Serializable]
    public enum PayType : int
    {
        /// <summary>
        /// AAA
        /// </summary>
        [Description("AAA")]
        AAA= 1,

        /// <summary>
        /// BBB
        /// </summary>
        [Description("BBB")]
        BBB= 2
    }

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