Use the attribute name and value of the Expression tree response class, expressiontree

Use the attribute name and value of the Expression tree response class, expressiontree

Expression Tree Expression is an important function in Linq. It is helpful to have a deep understanding of Lamda and computation expressions.

The following describes how to use Expression <Func <Object> [] to obtain the operands, member names, and values in Func <Object>.

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Linq.Expressions;using System.Reflection;namespace ExpressionTree{    class Program    {        static void Main(string[] args)        {            MyClass cls = new MyClass() { Memo = "ffffddddd", Name = "dfdf", Age = 33 };            Dictionary<string, string> dic = GetProps(() => cls.Memo, () => cls.Age);            foreach (KeyValuePair<string,string> item in dic)            {                Console.WriteLine(item.Key + "=" + item.Value);            }            Console.Read();        }        static Dictionary<string, string> GetProps(params Expression<Func<Object>>[] funcs)        {            Dictionary<string, string> dic = new Dictionary<string, string>();            MemberExpression member = null;            UnaryExpression unary = null;            foreach (Expression<Func<Object>> func in funcs)            {                unary = func.Body as UnaryExpression;                if (unary != null)                {                    member = unary.Operand as MemberExpression;                }                else                {                    member = func.Body as MemberExpression;                }                PropertyInfo prop = member.Member as PropertyInfo;                object value    = func.Compile().Invoke();                dic.Add(prop.Name, Convert.ToString(value));            }            return dic;        }    }    class MyClass    {        public string Name { get; set; }        public int Age { get; set; }        public string Memo { get; set; }    }}