comboBox获取value中的值

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)

    {

        string a = ((ComboBoxItem)comboBox2.SelectedItem).Value;

        textBox2.Text = a;

    }



    private void Form1_Load(object sender, EventArgs e)

    {

        ComboBoxItem i1 = new ComboBoxItem();

        i1.Text = "this is i1";

        i1.Value = "001";

        ComboBoxItem i2 = new ComboBoxItem();

        i2.Text = "this is i2";

        i2.Value = "002";



        comboBox2.Items.Add(i1);

        comboBox2.Items.Add(i2);

        comboBox2.DisplayMember = "text";
        comboBox2.ValueMember = "value";        



         

    }

    public class ComboBoxItem

    {

        private string m_Text;

        private string m_Value;

        public ComboBoxItem()

        {

            this.m_Text = String.Empty;

            this.m_Value = String.Empty;

        }

        public string Text

        {

            get { return this.m_Text; }

            set { this.m_Text = value; }

        }

        public string Value

        {

            get { return this.m_Value; }

            set { this.m_Value = value; }

        }

        public override string ToString()

        {

            return this.m_Text;  //最关键的

        }  

    }

ComboBox的Items不能添加Value

不想用绑定的话,自已写一个实现Value和Text属性的类,然后重写ToString()方法,并返回和Text属性一样的值,然后把这个类的实际Add到ComboBox.Items中,取值时再转换一下类型.   
  当你往ComboxBox的Item中扔一个任意object时,显示出的内容就是这个object的ToString()方法.所以必须重写ToString()方法,来显示你要显示的内容.