聊聊程式

var originalList = this.HotfixRepo.Query(x => x.Id == id).ToList();
var nowList = hotfixTitles.Select(title => new Hotfix
{
	Id = id,
	Title = title,
	Hotfix = hotfix
}).ToList();

var newList = nowList.Where(x => 
    !originalList.Select(m => m.Hotfix).Contains(x.Hotfix)).ToList();

var deleteList = originalList.Where(x => 
    !nowList.Select(c => c.Hotfix).Contains(x.Hotfix)).ToList();

var UpdateList = nowList.Where(x => 
    originalList.Any(m => m.Hotfix == x.Hotfix && m.Title != x.Title)).ToList();

foreach (var newItem in newList)
{
	this.HotfixRepo.Create(newItem);
}

foreach (var deleteItem in deleteList)
{
	this.HotfixRepo.Remove(deleteItem);
}

foreach (var updateItem in UpdateList)
{
	var t = originalList.Single(x => x.Id == updateItem.Id &&
					 x.Hotfix == updateItem.Hotfix);
	t.FullTitle = updateItem.FullTitle;
}

   public class HotfixInfo
    {
        public long Id { get; set; }
        /// <summary>
        /// KB123456
        /// </summary>
        public string Hotfix { get; set; }

        /// <summary>
        /// 201404 Windows安全性更新 (KB123456)
        /// </summary>
        public string FullTitle { get; set; }
    }

    public class CompareResult
    {
        public List<HotfixInfo> ToBeAdded { get; set; }
        public List<HotfixInfo> ToBeUpdated { get; set; }
        public List<HotfixInfo> ToBeDeleted { get; set; }
    }

    public static class CompareHelper
    {
        /// <summary>
        /// 比對出 要新增 要修改 要刪除的資料
        /// </summary>
        /// <param name="nowList"></param>
        /// <param name="originalList"></param>
        /// <returns></returns>
        public static CompareResult CompareList(List<HotfixInfo> nowList, List<HotfixInfo> originalList )
        {
            var result = new CompareResult();
            result.ToBeAdded = nowList.Where(x => !originalList.Select(m => m.Hotfix).Contains(x.Hotfix)).ToList();
            result.ToBeDeleted = originalList.Where(x => !nowList.Select(c => c.Hotfix).Contains(x.Hotfix)).ToList();
            result.ToBeUpdated = nowList.Where(x => originalList.Any(m => m.Hotfix == x.Hotfix && m.FullTitle != x.FullTitle)).ToList();

            return result;
        }
    }