C# 父类和子类的相互转换

迷南。 2023-02-13 03:16 69阅读 0赞

/**************************************
     * ClsHelper.cs
     **************************************/
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Xml.Linq;
    
    namespace ClsHelper {
        public class ClsHelper {
            /// <summary>
            /// 从父类到子类转换
            /// </summary>
            /// <typeparam name="TP">父类</typeparam>
            /// <typeparam name="TC">子类</typeparam>
            /// <param name="parent"></param>
            /// <returns></returns>
            public static TC CopyFromParent<TP, TC> (TP parent) where TC : TP, new () where TP : new () {
                if (parent == null) return default (TC);
                var child = new TC ();
                typeof (TP).GetProperties ().Where (p => p.CanRead && p.CanWrite).ToList ()
                    .ForEach (p => p.SetValue (child, p.GetValue (parent, null), null));
                return child;
            }
    
            /// <summary>
            /// 从子类到父类
            /// </summary>
            /// <typeparam name="TP">父类</typeparam>
            /// <typeparam name="TC">子类</typeparam>
            /// <param name="child"></param>
            /// <returns></returns>
            public static TP CopyToParent<TP, TC> (TC child) where TC : TP, new () where TP : new () {
                if (child == null) return default (TP);
                var parent = new TP ();
                typeof (TP).GetProperties ().Where (p => p.CanRead && p.CanWrite).ToList ()
                    .ForEach (p => p.SetValue (parent, p.GetValue (child, null), null));
                return parent;
            }
        }
    }

/**************************************
     * A.cs 父类
     **************************************/
    using System;
    
    namespace ClsHelper {
        public class A {
            public string a1 { get; set; }
        }
    }

/**************************************
     * B.cs 子类
     **************************************/
    using System;
    
    namespace ClsHelper {
        public class B : A {
            public string b1 { get; set; }
        }
    }

/**************************************
     * Program.cs
     **************************************/
    using System;
    
    namespace ClsHelper {
        class Program {
            static void Main (string[] args) {
                A aa = new A ();
                aa.a1 = "aa_a1";
    
                var bb = ClsHelper.CopyFromParent<A, B> (aa);
                bb.b1 = "bb_b1";
                Console.WriteLine (bb.a1);
    
                bb.a1 = "bb_a1";
                aa = ClsHelper.CopyToParent<A, B> (bb);
                Console.WriteLine (aa.a1);
            }
        }
    }

>> aa_a1
    >> bb_a1