昶達的部落格

WinForm要建立comboBox，選單的text與value是不同值，例如text為1分鐘、value為60。並將某value設為預選項。

comboBox變換選取時，顯示選擇的text、value及index。

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace TEST

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            //設定ComboBox的Text及Value值

            //comboBox1.Items.Add(new ComboboxItem("0z", "zero"));

            //清空ComboBox

            //comboBox1.Items.Clear();

            //設定ComboBox的Text及Value值

            comboBox1.Items.Add(new ComboboxItem("1a", "one"));

            comboBox1.Items.Add(new ComboboxItem("2b", "onetwo"));

            comboBox1.Items.Add(new ComboboxItem("3c", "onetwothree"));

            //預設選擇項

            //預設選擇value=2b之項目

            var selectedObject = comboBox1.Items.Cast<ComboboxItem>().SingleOrDefault(i => i.Value.Equals("2b"));

            comboBox1.SelectedIndex = comboBox1.FindStringExact(selectedObject.Text.ToString());

            label1.Text = "選擇Text=" + selectedObject.Text.ToString();

            label2.Text = "選擇Value=" + selectedObject.Value.ToString();

            label3.Text = "選擇index=" + comboBox1.FindStringExact(selectedObject.Text.ToString()).ToString();

        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)

        {

            ComboboxItem item = comboBox1.Items[comboBox1.SelectedIndex] as ComboboxItem;

            label1.Text = "選擇Text=" + comboBox1.Text;

            label2.Text = "選擇Value=" + item.Value.ToString();

            label3.Text = "選擇index=" + comboBox1.SelectedIndex.ToString();

        }

        private class ComboboxItem {

            public ComboboxItem(string value, string text)

            {

                Value = value;

                Text = text;

            }

            public string Value {

                get;

                set;

            }

            public string Text {

                get;

                set;

            }

            public override string ToString() {

                return Text;

            }

        }

    }

}