类创造:

namespace WindowsFormsApplication1
{
    class select
    {
        public string Text { get; set; }
        public string Value { get; set; }
    }
}

Form1代码:

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            List<select> sl = new List<select>();
            sl.Add(new select() { Text = "", Value = "" });
            sl.Add(new select() { Text = "AAA", Value = "aa" });
            sl.Add(new select() { Text = "BBB", Value = "bb" });
            comboBox1.DataSource = sl;
            comboBox1.DisplayMember = "Text";
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

            select sl1 = comboBox1.SelectedItem as select;
            t1.Text = Convert.ToString(sl1.Value);

        }

    }
}

不知道这是否适用于原始帖子中给出的情况(不要介意这是两年后的事实)，但这个例子对我来说是适用的:

Hashtable htImageTypes = new Hashtable();
htImageTypes.Add("JPEG", "*.jpg");
htImageTypes.Add("GIF", "*.gif");
htImageTypes.Add("BMP", "*.bmp");

foreach (DictionaryEntry ImageType in htImageTypes)
{
    cmbImageType.Items.Add(ImageType);
}
cmbImageType.DisplayMember = "key";
cmbImageType.ValueMember = "value";

要读取回值，必须将SelectedItem属性转换为DictionaryEntry对象，然后可以计算该对象的Key和value属性。例如:

DictionaryEntry deImgType = (DictionaryEntry)cmbImageType.SelectedItem;
MessageBox.Show(deImgType.Key + ": " + deImgType.Value);

Visual Studio 2013是这样做的:

单一项目:

comboBox1->Items->AddRange(gcnew cli::array< System::Object^  >(1) { L"Combo Item 1" });

多个项目:

comboBox1->Items->AddRange(gcnew cli::array< System::Object^  >(3)
{
    L"Combo Item 1",
    L"Combo Item 2",
    L"Combo Item 3"
});

不需要重写类或包含任何其他内容。是的，comboBox1->SelectedItem和comboBox1->SelectedIndex调用仍然有效。

您必须创建自己的类类型并重写ToString()方法以返回所需的文本。下面是一个你可以使用的类的简单例子:

public class ComboboxItem
{
    public string Text { get; set; }
    public object Value { get; set; }

    public override string ToString()
    {
        return Text;
    }
}

下面是它使用的一个简单例子:

private void Test()
{
    ComboboxItem item = new ComboboxItem();
    item.Text = "Item text1";
    item.Value = 12;

    comboBox1.Items.Add(item);

    comboBox1.SelectedIndex = 0;

    MessageBox.Show((comboBox1.SelectedItem as ComboboxItem).Value.ToString());
}

您可以使用此代码将一些项插入到具有文本和值的组合框中。

C#

private void ComboBox_SelectionChanged_1(object sender, SelectionChangedEventArgs e)
{
    combox.Items.Insert(0, "Copenhagen");
    combox.Items.Insert(1, "Tokyo");
    combox.Items.Insert(2, "Japan");
    combox.Items.Insert(0, "India");   
}

XAML

<ComboBox x:Name="combox" SelectionChanged="ComboBox_SelectionChanged_1"/>

using (SqlConnection con = new SqlConnection(insertClass.dbPath))
{
    con.Open();
    using (SqlDataAdapter sda = new SqlDataAdapter(
    "SELECT CategoryID, Category FROM Category WHERE Status='Active' ", con))
    {
        //Fill the DataTable with records from Table.
        DataTable dt = new DataTable();
        sda.Fill(dt);
        //Insert the Default Item to DataTable.
        DataRow row = dt.NewRow();
        row[0] = 0;
        row[1] = "(Selecione)";
        dt.Rows.InsertAt(row, 0);
        //Assign DataTable as DataSource.
        cboProductTypeName.DataSource = dt;
        cboProductTypeName.DisplayMember = "Category";
        cboProductTypeName.ValueMember = "CategoryID";
    }
}             
con.Close();