DevExpress ComboBoxEdit 添加值

今天在使用ComboBoxEdit 这个控件的时候,不知道怎么添加值.

在官网上找到代码。在这里做个记录

 ComboBoxEdit combo = new ComboBoxEdit();

  ComboBoxItemCollection coll = combo.Properties.Items;

  coll.BeginUpdate();

  try {

    coll.Add(new PersonInfo("Sven", "Petersen"));

    coll.Add(new PersonInfo("Cheryl", "Saylor"));

    coll.Add(new PersonInfo("Dirk", "Luchte"));

  }

  finally {

    coll.EndUpdate();

  }

  combo.SelectedIndex = -;

  Controls.Add(combo);

//...

  public class PersonInfo {

    private string _firstName;

    private string _lastName;

    public PersonInfo(string firstName, string lastName) {

      _firstName = firstName;

      _lastName = lastName;

    }

    public override string ToString() {

      return _firstName + " " + _lastName;

    }

  }

 public class ExComboBox

    {

        public int Index { get; set; }

        public string Key { get; set; }

        public string Value { get; set; }

        public string Tag { get; set; }

        public ExComboBox(int pIndex, string pKey, string pValue)

        {

            this.Index = pIndex;

            this.Key = pKey;

            this.Value = pValue;

        }

        public ExComboBox(int pIndex, string pKey, string pValue, string pTag)

        {

            this.Index = pIndex;

            this.Key = pKey;

            this.Value = pValue;

            this.Tag = pTag;

        }

        public override string ToString()

        {

            return this.Value;

        }

    }

  comboBox.Properties.Items.Add("全部");

                 for (int i = ; i < arg.Result.Count; i++)

                      {

                         comboBox.Properties.Items.Add(new ExComboBox(i, arg.Result[i].F_RoadwayCode, arg.Result[i].F_StationCode.ToString()));

                       }

  void comboBoxEditStation_SelectedValueChanged(object sender, System.EventArgs e)

        {

            var exComboBox1 = this.comboBoxEditRoadWay.SelectedItem as ExComboBox;

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