應用場景

  現有兩張表，表A,表B(歷史表) ,需將表A中與表B中相同欄位的資料進行賦值到表B中

分為兩種實現情況

一、表B中沒有任何資料

二、表B中有資料非空

 /// <summary>
    /// 實體轉換類
    /// </summary>
    public class EntityCoverter
    {
        /// <summary>
        /// 將源實體轉換到空的實體類中
        /// </summary>
        /// <typeparam name="T1"></typeparam>
 

        /// <typeparam name="T2"></typeparam>
        /// <param name="source"></param>
        /// <returns></returns>
        public static T2 Covert<T1, T2>(T1 source)
        {
            T2 result = default(T2);

            PropertyInfo[] pi = typeof(T2).GetProperties();

            PropertyInfo[] pi1 
 
= typeof(T1).GetProperties();

            result = Activator.CreateInstance<T2>();

            for (int i = 0; i < pi.Length; i++)
            {
                PropertyInfo temp = pi1.Where(t => t.Name == pi[i].Name).FirstOrDefault();
                if (temp != null)
                {
                    
 
try
                    {
                        pi[i].SetValue(result, temp.GetValue(source, null), null);
                    }
                    catch(Exception ex)
                    {

                    }
                }
            }
            return result;
        }

        /// <summary>
        /// 將源實體轉換到非空的實體中
        /// </summary>
        /// <typeparam name="T1"></typeparam>
        /// <typeparam name="T2"></typeparam>
        /// <param name="source"></param>
        /// <param name="destination"></param>
        /// <returns></returns>
        public static T2 Covert<T1, T2>(T1 source,T2 destination)
        {
            PropertyInfo[] pi = typeof(T2).GetProperties();

            PropertyInfo[] pi1 = typeof(T1).GetProperties();

            for (int i = 0; i < pi.Length; i++)
            {
                PropertyInfo temp = pi1.Where(t => t.Name == pi[i].Name).FirstOrDefault();
                if (temp != null)
                {
                    try
                    {
                        pi[i].SetValue(destination, temp.GetValue(source, null), null);
                    }
                    catch
                    {
                    }
                }
            }
            return destination;
        }
    }

呼叫方法

           
            var list =  獲取表A值，將表A的值處理成一個list集合ToList();
            List<B> result = new List<B>();
            foreach (var item in list)
            {
                var simple = EntityCoverter.Covert<A, B>(item);
                result.Add(simple);
            }
          return  result;