下拉框--可多选

方法 1：控件 checkedComboBoxEdit

///清空选项

checkedComboBoxEdit1.Properties.Items.Clear();

///添加选项

checkedComboBoxEdit1.Properties.Items.Add("选项1-name", "选项1-description", CheckState.Checked, true);

方法 2：

/// <summary>
/// 点击隐藏或显示选择框，并将所选内容显示在bte_status中
/// bte_status为输入选择控件(ButtonEdit)
/// checkedListBoxControl1为控件（checkedListBoxControl）
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void bte_status_ButtonClick_1(object sender, DevExpress.XtraEditors.Controls.ButtonPressedEventArgs e)
{
    if (this.checkedListBoxControl1.Visible.Equals(true))
    {
        this.checkedListBoxControl1.Visible = false;
        ///获取选中的内容
        string output = string.Empty;
        for (int i = 0; i < checkedListBoxControl1.CheckedIndices.Count; i++)
        {
            output += checkedListBoxControl1.Items[
            checkedListBoxControl1.CheckedIndices[i]].ToString() + ",";
        }
        //去掉最后的，号
        if (output.Length > 0 && output.Substring(output.Length - 1).Equals(","))
        {
            output = output.Substring(0,output.Length - 1);
        }
        this.bte_status.Text = output;
    }
    else
    {
        this.checkedListBoxControl1.Visible = true;
        string output = string.Empty;
        ///获取选中的内容
        for (int i = 0; i < checkedListBoxControl1.CheckedIndices.Count; i++)
        {
            output += checkedListBoxControl1.Items[
            checkedListBoxControl1.CheckedIndices[i]].ToString() + ", ";
        }
        //去掉最后的，号
        if (output.Length > 0 && output.Substring(output.Length - 1).Equals(","))
        {
            output = output.Substring(0, output.Length - 1);
        }
        this.bte_status.Text = output;
    }
}