Expression与Func的区别（Expression与反射的结合使用）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace DataTableTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            List people = new List()
            {
                new Person(){ Name="张三", Age=20, Gender=true, Address="中山路1号"},
                new Person(){ Name="李四", Age=32, Gender=true, Address="黄埔路1号"},
                new Person(){ Name="王五", Age=25, Gender=true, Address="天河路1号"},
                new Person(){ Name="赵六", Age=28, Gender=true, Address="荔湾路1号"},
            };
            dataGridView1.DataSource = CustomDataTable(people, p => p.Name, p => p.Age, /*p => p.Gender,*/ p => p.Address);
        }
 
        //此处参数如果传的是Func，那就无法用反射解析出内部的Member，这就是Expression优于Func之处
        private DataTable CustomDataTable<T>(List datas, params Expressionobject>>[] columns)
        {
            DataTable dt = new DataTable();
            string[] colName = new string[columns.Length];
            int cnt = 0;
            foreach (var col in columns)
            {
                MemberExpression prop;
                if (col.Body is UnaryExpression ue && ue.NodeType == ExpressionType.Convert)
                {
                    prop = ue.Operand as MemberExpression;
                }
                else
                {
                    prop = col.Body as MemberExpression;
                }
                colName[cnt++] = prop.Member.Name;
                string attrVal = (prop.Member.GetCustomAttributes(typeof(DescriptionAttribute),false)[0] as DescriptionAttribute).Description;
                dt.Columns.Add(new DataColumn(attrVal));
            }
            foreach (var item in datas)
            {
                var row = dt.Rows.Add();
                for (int i = 0; i < colName.Length; i++)
                {
                    row[i] = item.GetType().GetProperty(colName[i]).GetValue(item).ToString();
                }
            }
            return dt;
        }
    }
 
    public class Person
    {
        [Description("姓名")]
        public string Name { get; set; }
        [Description("年龄")]
        public double Age { get; set; }
        [Description("性别")]
        public bool Gender { get; set; }
        [Description("地址")]
        public string Address { get; set; }
    }
 
    
}