如何通过选择另一个Combobox的项目来添加Combobox的项目如果两个Combobox都在C＃的Datagridview中 [英] How Can I Add Items Of Combobox By Selcting Another Combobox's item If Both Combobox Are In Datagridview Of C#
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问题描述
我有DataGridView，它包含两个ComboBox列。我希望第二个ComboBox将根据第一个ComboBox中的选定值填充数据。
以下是我的代码。
谢谢
-Tushar
I have DataGridView which contains two ComboBox columns. I want that The second ComboBox will be filled with data depending on the selected value from first ComboBox.
Below is my code.
Thank you
-Tushar
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace t1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
logicload(2, 2);
}
public void logicload(int row, int col)
{
dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;
for (int i = 1; i <= col; i++)
{
dataGridView1.Columns.Add("Col" + i, "Stage" + i);
}
dataGridView1.Rows.Add(row);
//make row 1 at all columns into combobox cell.
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";
loadComboboxesSampleItems();
}
DataGridViewComboBoxCell CellColumn1, CellColumn2;
private void loadComboboxesSampleItems()
{
CellColumn1 = (DataGridViewComboBoxCell)this.dataGridView1.Rows[0].Cells[1];
CellColumn2 = (DataGridViewComboBoxCell)this.dataGridView1.Rows[1].Cells[1];
var list1 = new List<string>() { "IND", "PAK", "AUS", "USA" };
// var list2 = new List<string>() { "AGRA", "DEHLI", "KANPUR" };
var list3 = new List<string>() { "MOhali" };
CellColumn1.DataSource = list1;// CellColumn2.DataSource = list2;
}
private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
ComboBox combo = e.Control as ComboBox;
if (combo != null)
{
combo.SelectedIndexChanged -= new EventHandler(ComboBox_SelectedIndexChanged);
combo.SelectedIndexChanged += new EventHandler(ComboBox_SelectedIndexChanged);
}
}
private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
var list2 = new List<string>() { "AGRA", "DEHLI", "KANPUR" };
if (CellColumn1.Selected.Equals(true))
{
ComboBox cb = (ComboBox)sender;
string item = cb.Text;
if (item != null)
{
if (cb.SelectedIndex.Equals(0))
{
//MessageBox.Show(item);
CellColumn2.DataSource = list2;
}
}
}
}
}
}
推荐答案
- 您的陈述
for（int i = 1; i< = col; i ++）
使用意外的初始值和意外的条件测试。我原以为
for（int i = 0;（i< col）; i ++）。
在C＃中，数组索引从0开始。
- 片段
Col+ i， 舞台+我
是懒惰编程的标志。 i不是字符串，不应该以这种方式使用。你应该用过
Col+ i.ToString（），Stage+ i.ToString（）
- CellColumn1.Selected是一个布尔值。它返回true或false。所以你的if语句
if（CellColumn1.Selected.Equals（true））
应阅读
if（CellColumn1.Selected）
- 你的if语句
if（item！= null）
应该读取
< br>
if（！String.IsNullOrEmpty（item））
- 你的if语句
if（combo_box.SelectedIndex .Equals（0））
应阅读
if（combo_box.SelectedIndex == 0）
- 您没有包含所选国家/地区的数据
工作示例如下。
Working example follows.
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
希望有所帮助。
Hope that helps.
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