关于集合的扩展 C#

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/// <summary>         ///         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="sources"></param>         /// <param name="details"></param>         /// <param name="mdRelation"></param>         /// <returns></returns>         public static List<T> Intersect<T>(this List<T> sources, List<T> details, Func<T, T, bool> compareCond)         {             List<T> result = new List<T>();             sources?.ForEach(item =>             {                 details?.ForEach(detail =>                 {                     if (compareCond(detail, item))                     {                         result.Add(item);                         return;                     }                 });             });               return result;         }           /// <summary>         /// 取差集合 A-B,A集合中有B集合中无的         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="sources"></param>         /// <param name="details"></param>         /// <param name="compareCond"></param>         /// <returns></returns>         public static List<T> Expect<T>(this List<T> sources, List<T> details, Func<T, T, bool> compareCond)         {             List<T> result = new List<T>();             sources?.ForEach(item =>             {                 if (!details.Exist<T>(item, compareCond))                 {                     result.Add((T)item);                 }             });               return result;         }             /// <summary>         /// 取并集（A和B取并集，共通的项目选A）         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="source"></param>         /// <param name="entity"></param>         /// <param name="compareCond"></param>         /// <returns></returns>           public static List<T> Union<T>(this List<T> source, List<T> target, Func<T, T, bool> compareCond)         {             List<T> result = new List<T>();             result.AddRange(source);             target?.ForEach(item =>             {                 if (!target.Exist<T>(item, compareCond))                 {                     result.Add(item);                 }             });               return result;         }             /// <summary>         ///         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="entity"></param>         /// <returns></returns>         public static bool Exist<T>(this List<T> source, T entity,Func<T, T, bool> compareCond)         {             bool bExist = false;             source.ForEach(item =>             {                 if (compareCond(item, entity))                 {                     bExist = true;                     return;                 }             });             return bExist;         }