/// <summary>
    /// 描    述：彈出模型對象列表比較器(根據ID比較)
    /// </summary>
    public class PopupComparer : IEqualityComparer<Model.PopupModel.PopupModel>
    {
        public static PopupComparer Default = new PopupComparer();
        #region IEqualityComparer<PopupModel> 成員
        public bool Equals(Model.PopupModel.PopupModel x, Model.PopupModel.PopupModel y)
        {
            return x.Id.Equals(y.Id);
        }
        public int GetHashCode(Model.PopupModel.PopupModel obj)
        {
            return obj.GetHashCode();
        }
        #endregion
    }

List<PopupModel> list = new List<PopupModel>();
//model為要比較的對象
if(list.Contains<PopupModel>(model,PopupComparer.Default))
{
}