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;
            }
        }