C#对象深表复制方法

Posted 2022-02-16 taofengfeng

 //反射
        public static TOut TransReflection<TIn, TOut>(TIn tIn)
        
            TOut tOut = Activator.CreateInstance<TOut>();
            var tInType = tIn.GetType();
            foreach (var itemOut in tOut.GetType().GetProperties())
            
                var itemIn = tInType.GetProperty(itemOut.Name); ;
                if (itemIn != null)
                
                    itemOut.SetValue(tOut, itemIn.GetValue(tIn,null),null);
                
            
            return tOut;
        

        //序列化
        public static TOut TransJsonConvert<TIn, TOut>(TIn tIn)
                   
            return JsonConvert.DeserializeObject<TOut>(JsonConvert.SerializeObject(tIn));
        

using System.Linq.Expressions;
 /// <summary>
    /// 表达式树实现的深表复制
    /// </summary>
    /// <typeparam name="TIn"></typeparam>
    /// <typeparam name="TOut"></typeparam>
    public static class TransExp<TIn, TOut>
    

        private static readonly Func<TIn, TOut> cache = GetFunc();
        private static Func<TIn, TOut> GetFunc()
        
            ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
            List<MemberBinding> memberBindingList = new List<MemberBinding>();

            foreach (var item in typeof(TOut).GetProperties())
            
                if (!item.CanWrite)
                    continue;

                MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));
                MemberBinding memberBinding = Expression.Bind(item, property);
                memberBindingList.Add(memberBinding);
            

            MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray());
            Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[]  parameterExpression );

            return lambda.Compile();
        

        public static TOut Trans(TIn tIn)
        
            return cache(tIn);