C# WinForm ComboBox 自定义数据项 (ComboBoxItem )

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication3
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        public struct ComboBoxItem<TKey, TValue>
        {
            private TKey key;
            private TValue value;

            public ComboBoxItem(TKey key, TValue value)
            {
                this.key = key;
                this.value = value;
            }

            public TKey Key
            {
                get { return key; }
            }

            public TValue Value
            {
                get { return value; }
            }

            public override string ToString()
            {
                return Value.ToString();
            }
        }

        private void Form3_Load(object sender, EventArgs e)
        {
            //KeyValuePair<int, string> keys = new KeyValuePair<int,string>();
            this.comboBox1.Items.Add(new ComboBoxItem<int, string>(1, "Lin"));
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            var item = (ComboBoxItem<int, string>)this.comboBox1.SelectedItem;

            Text = item.Value;
        }
    }
}

　　

一个 1月 到12 月的下拉单

            for (int i = 1; i <= 12; i++)
            {
                this.comboBox1.Items.Add(
                   new ComboBoxItem<int, string>(i, 
                          String.Concat(i.ToString().PadLeft(2, '0'), "月")));
            }