C# winform中ComboBox数据绑定的两种方法及效率详解

           //创建DataTable
            DataTable dataTable = new DataTable();
 
            dataTable.Columns.Add("ID");
            dataTable.Columns.Add("Name");
 
            DataRow dataRow = dataTable.NewRow();
 
            dataRow["ID"] = "1";
            dataRow["Name"] = "方法1-测试1";
            dataTable.Rows.Add(dataRow);
 
            DataRow dataRow1 = dataTable.NewRow();
            dataRow1["ID"] = "2";
            dataRow1["Name"] = "方法1-测试2";
            dataTable.Rows.Add(dataRow1);
 
            DataRow dataRow2 = dataTable.NewRow();
            dataRow2["ID"] = "3";
            dataRow2["Name"] = "方法1-测试3";
            dataTable.Rows.Add(dataRow2);
 
            // ComboBox数据绑定
            this.comboBox1.DataSource = dataTable;
            comboBox1.DisplayMember = "Name";
            comboBox1.ValueMember = "ID";

       //创建Test类
        public class Test
        {
            public Test() { }
            public Test(int sid, string name, int age)
            {
                SID = sid;
                Name = name;
                Age = age;
            }
            public string Name { get; }
            public int Age { get; }
            public int SID { get; }
         }
        public List<Test> GetDate2()
        {
            List<Test> list = new List<Test>();
            Test test = new Test(1, "方法二--测试1", 21);
            list.Add(test);
            Test test1 = new Test(2, "方法二--测试2", 22);
            list.Add(test1);
            Test test2 = new Test(3, "方法二--测试3", 23);
            list.Add(test2);
           // ComboBox数据绑定Lsit
            this.comboBox2.DataSource = list;
            comboBox2.DisplayMember = "Name";
            comboBox2.ValueMember = "SID";
            return list;
        }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            方法一
            //this.comboBox1.DataSource = GteDate1();
            //comboBox1.DisplayMember = "Name";
            //comboBox1.ValueMember = "ID";
            方法二
            //this.comboBox2.DataSource = GetDate2();
            //comboBox2.DisplayMember = "Name";
            //comboBox2.ValueMember = "SID";
            #region 处理2
            //创建计时
            Stopwatch str1 = new Stopwatch();
            //计时开始
            str1.Start();
            //运行方法一
            GetDate1();
            // 计时停止
            str1.Stop();
            //控件label1显示出总共花费的时间（单位毫秒）
            this.label1Time1.Text = str1.Elapsed.TotalMilliseconds.ToString();
            //创建计时
            Stopwatch str2 = new Stopwatch();
            //计时开始
            str2.Start();
            //运行方法二
            GetDate2();
            // 计时停止
            str2.Stop();
            //控件label1显示出总共花费的时间（单位毫秒）
            this.label1Time2.Text = str2.Elapsed.TotalMilliseconds.ToString();
            #endregion 
        }
        #region ComboBox两种数据绑定的方法
        //方法一，dataTable
        public DataTable GetDate1()
        {
            //创建DataTable
            DataTable dataTable = new DataTable();
            dataTable.Columns.Add("ID");
            dataTable.Columns.Add("Name");
            DataRow dataRow = dataTable.NewRow();
            dataRow["ID"] = "1";
            dataRow["Name"] = "方法1-测试1";
            dataTable.Rows.Add(dataRow);
            DataRow dataRow1 = dataTable.NewRow();
            dataRow1["ID"] = "2";
            dataRow1["Name"] = "方法1-测试2";
            dataTable.Rows.Add(dataRow1);
            DataRow dataRow2 = dataTable.NewRow();
            dataRow2["ID"] = "3";
            dataRow2["Name"] = "方法1-测试3";
            dataTable.Rows.Add(dataRow2);
            // 数据绑定
            this.comboBox1.DataSource = dataTable;
            comboBox1.DisplayMember = "Name";
            comboBox1.ValueMember = "ID";
            return dataTable; 
        }
        // 方法二，list
            //创建Test类
        public class Test
        {
            public Test() { }
            public Test(int sid, string name, int age)
            {
                SID = sid;
                Name = name;
                Age = age;
            }
            public string Name { get; }
            public int Age { get; }
            public int SID { get; }
         }
        public List<Test> GetDate2()
        {
            List<Test> list = new List<Test>();
            Test test = new Test(1, "方法二--测试1", 21);
            list.Add(test);
            Test test1 = new Test(2, "方法二--测试2", 22);
            list.Add(test1);
            Test test2 = new Test(3, "方法二--测试3", 23);
            list.Add(test2);
            this.comboBox2.DataSource = list;
            comboBox2.DisplayMember = "Name";
            comboBox2.ValueMember = "SID";
            return list;
        }
         #endregion
    }
}