C# 对象快速复制

    public static class TransExpV2
    {
        private static readonly Func cache = GetFunc();
        private static Func GetFunc()
        {
            ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
            List memberBindingList = new List();
            foreach (var item in typeof(TOut).GetProperties())
            {
                if (!item.CanWrite) continue;
                if (typeof(TIn).GetProperty(item.Name) == null) 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> lambda = Expression.Lambda>(memberInitExpression, new ParameterExpression[] { parameterExpression });
            return lambda.Compile();
        }

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