如何在C＃帮助上更改DataGridViewComboBoxCell的样式？

问题描述

我想将DataGridViewComboBoxCell的样式从Drop-Down更改为Simple

请帮帮我，我真的需要它。



这是我的代码

I want to change the style of DataGridViewComboBoxCell from Drop-Down to "Simple"
please help me i really need it.

here is my Code

using System;
using System.Collections.Generic;
using System.Windows.Forms;
 
namespace DataGridViewComboBoxes
    {
 
    // *************************************************** class Form1

    public partial class Form1 : Form
        {
 
        // *************************************** enums and constants

        enum ControlTypes
            {
            COMBO,
            TEXT
            }
 
        const int                   CITIES_ROW = 1;
        const int                   CITIES_CELL = 1;
        const int                   COUNTRIES_ROW = 0;
        const int                   COUNTRIES_CELL = 1;
 
        const int                   NUMBER_COLUMNS = 2;
        const int                   NUMBER_ROWS = 2;
 
        // ************************************************* variables

        List < string >             Australian_cities = 
                                        new List < string > ( ) { 
                                            "Sydney", 
                                            "Melbourne", 
                                            "Brisbane", 
                                            "Perth", 
                                            "Adelaide" };
        DataGridViewComboBoxCell    countries_cell;
        DataGridViewComboBoxCell    cities_cell;
        List < string >             cities;
        List < string >             Indian_cities = 
                                        new List < string > ( ) { 
                                            "Mumbai", 
                                            "Delhi", 
                                            "Bangalore", 
                                            "Karnataka", 
                                            "Hyderabad" };
        List < string >             Pakistani_cities = 
                                        new List < string > ( ) { 
                                            "Karachi", 
                                            "Lahore", 
                                            "Faisalabad", 
                                            "Rawalpindi", 
                                            "Punjab" };
         List < string >             USA_cities = 
                                        new List < string > ( ) { 
                                            "New York", 
                                            "Los Angeles", 
                                            "Chicago", 
                                            "Houston", 
                                            "Philadelphia" };
        List < string >             countries = 
                                        new List < string > ( ) { 
                                            "IND", 
                                            "PAK", 
                                            "AUS", 
                                            "USA" };
 
        // ***************************************************** Form1

        public Form1 ( )
            {
            InitializeComponent ( );
 
            initialize_datagridview ( NUMBER_ROWS, NUMBER_COLUMNS );
            load_sample_data ( );
 
            dataGridView1.DataError += 
                new DataGridViewDataErrorEventHandler ( 
                    dataGridView1_DataError );
            }
 
        // *********************************** dataGridView1_DataError

        void dataGridView1_DataError ( 
                                object                         sender, 
                                DataGridViewDataErrorEventArgs e )
            {
 
            }
 
        // *********************************** initialize_datagridview

        void initialize_datagridview ( int rows, 
                                       int columns )
            {
 
            dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;
 
            for ( int i = 0; ( i < columns ); i++ )
                {
                string i_plus_one = ( i + 1 ).ToString ( );
 
                dataGridView1.Columns.Add ( "Col" + i_plus_one, 
                                            "Stage" + i_plus_one );
                }
 
            dataGridView1.Rows.Add ( rows );
                                        // make first row columns into 
                                        // DataGridViewComboBoxCell
            dataGridView1.Rows [ 0 ].Cells [ 1 ] = 
                                    new DataGridViewComboBoxCell ( );
            dataGridView1.Rows [ 1 ].Cells [ 1 ] = 
                                    new DataGridViewComboBoxCell ( );
 
            dataGridView1.Rows [ 0 ].Cells [ 0 ].Value = "Country";
            dataGridView1.Rows [ 1 ].Cells [ 0 ].Value = "City";
 
            dataGridView1.EditingControlShowing +=
                new DataGridViewEditingControlShowingEventHandler (
                    dataGridView1_EditingControlShowing );
            }
 
        // ****************************************** load_sample_data

        private void load_sample_data ( )
            {
 
            countries_cell = ( DataGridViewComboBoxCell ) 
                                dataGridView1.Rows [ COUNTRIES_ROW ].
                                              Cells [ COUNTRIES_CELL ];
            cities_cell = ( DataGridViewComboBoxCell ) 
                                dataGridView1.Rows [ CITIES_ROW ].
                                              Cells [ CITIES_CELL ];
            countries_cell.DataSource = null;
            countries_cell.DataSource = countries;
            }
 
        // *********************** dataGridView1_EditingControlShowing

        void dataGridView1_EditingControlShowing ( 
                    object                                     sender, 
                    DataGridViewEditingControlShowingEventArgs e )
            {
            ControlTypes    control_type;
            Object          editing_control;
 
            try
                {
                editing_control = 
                    ( DataGridViewTextBoxEditingControl ) e.Control;
                control_type = ControlTypes.TEXT;
                }
            catch
                {
                editing_control = 
                    ( DataGridViewComboBoxEditingControl ) e.Control;
                control_type = ControlTypes.COMBO;
                }
 
            if ( control_type == ControlTypes.COMBO )
                {
                ComboBox  combo_box = ( ComboBox ) editing_control;
 
                if ( combo_box != null )
                    {
                    combo_box.TextChanged -= 
                        new EventHandler ( 
                            editingcontrol_TextChanged );
                    combo_box.TextChanged += 
                        new EventHandler ( 
                            editingcontrol_TextChanged );
                    }
                }
            }
 
        // ******************************** editingcontrol_TextChanged

        void editingcontrol_TextChanged ( object    sender, 
                                             EventArgs e )
            {
 
            if ( countries_cell.Selected )
                {
                ComboBox    combo_box = ( ComboBox ) sender;
                string      text = combo_box.Text;
 
                if ( !String.IsNullOrEmpty ( text ) )
                    {
                    switch ( text )
                        {
                        case "IND":
                            cities = Indian_cities;
                            break;
 
                        case "PAK":
                            cities = Pakistani_cities;
                            break;
 
                        case "AUS":
                            cities = Australian_cities;
                            break;
 
                        case "USA":
                            cities = USA_cities;
                            break;
 
                        default:
                            throw new ApplicationException ( 
                                "Unrecognized country" );
                        }
                                        // avoid DataError by rebuild
                                        // of cities_cell
                    cities_cell.Dispose ( );
                    cities_cell = ( DataGridViewComboBoxCell ) 
                                        dataGridView1.
                                            Rows [ CITIES_ROW ].
                                            Cells [ CITIES_CELL ];
                    combo_box.TextChanged -= 
                        new EventHandler ( 
                            editingcontrol_TextChanged );
                    combo_box.TextChanged += 
                        new EventHandler ( 
                            editingcontrol_TextChanged );
 
                    cities_cell.DataSource = null;
                    cities_cell.DataSource = cities;
                    }
                }
            }
 
        } // class Form1

    } // namespace DataGridViewComboBoxes

推荐答案

void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    if (e.Control is ComboBox)
    {
        ComboBox box = (ComboBox)e.Control;
        box.DropDownStyle = ComboBoxStyle.Simple;
    }
}

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