/// <summary>
/// 为ComboBox绑定数据源并提供下拉提示
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="combox">ComboBox</param>
/// <param name="list">数据源</param>
/// <param name="displayMember">显示字段</param>
/// <param name="valueMember">隐式字段</param>
/// <param name="displayText">下拉提示文字</param>
public static void Bind<T>(this ComboBox combox, IList<T> list, string displayMember, string valueMember, string displayText)
{
  AddItem(list, displayMember, displayText);
  combox.DataSource = list;
  combox.DisplayMember = displayMember;
  if (!string.IsNullOrEmpty(valueMember))
 combox.ValueMember = valueMember;
}
private static void AddItem<T>(IList<T> list, string displayMember, string displayText)
{
  Object _obj = Activator.CreateInstance<T>();
  Type _type = _obj.GetType();
  if (!string.IsNullOrEmpty(displayMember))
  {
 PropertyInfo _displayProperty = _type.GetProperty(displayMember);
 _displayProperty.SetValue(_obj, displayText, null);
  }
  list.Insert(0, (T)_obj);
}

List<CommonEntity> Sources = new List<CommonEntity>();
private void WinComboBoxToolV2Test_Load(object sender, EventArgs e)
{
  CreateBindSource(5);
  comboBox1.Bind(Sources, "Name", "Age", "--请选择--");
}

private void CreateBindSource(int count)
{
  for (int i = 0; i < count; i++)
  {
 CommonEntity _entity = new CommonEntity();
 _entity.Age = i;
 _entity.Name = string.Format("Yan{0}", i);
 Sources.Add(_entity);
  }
}