I'm currently trying to add a ComboBox to a dataGridView.
In the DGV, there are 5 columns: checkbox, string, string, combobox, combobox.
both combobox-columns are configured as datagridviewcomboboxcolumns (via VisualStudio designer). My problem is to add rows.
My current try is: the columns are already defined and I add rows via dataGridView.Rows.Add. For that, I'm using an array of objects. Example:
dataGridViewRow row = new dataGridViewRow();
object[] obj = new object[5] {true, "str1", "str2", null, null};
dataGridView1.Rows.Add(obj);
This passes without any errors. But logically, the comboBoxes aren't filled with anything.
I tried setting a datasource to the 4th and 5th cell of a row:
Error...Using ROW.dataGridViewComboBoxCell.Items.Add: Items are not displayed...
filling obj[3] and 4 with a new DGVcomboBoxCell or -Column:
Error... :The error message says "The dataGridViewComboBoxCell-Value is invalid.
Further information: Each column should have the same Items in the comboBoxes. (These are previously loaded via internet, as xml). Setting a dataSource to the two columns destroys the whole DGV (I think because the other colmns don't have a Datasource). In a nutshell: How to add Rows to a DGV which contain comboboxes filled with items?
Sincerely, NoMad
edit: here's some code to solve my problem:
DataGridViewCheckBoxColumn check = new DataGridViewCheckBoxColumn();
check.Name = "Col1";
dataGridView1.Columns.Add(check);
dataGridView1.ColumnCount = 3;
dataGridView1.Columns[1].Name = "Col2";
dataGridView1.Columns[2].Name = "Col3";
object[] row = new object[] { true, "str1", "str2" };
dataGridView1.Rows.Add(row);
DataGridViewComboBoxColumn combo1 = new DataGridViewComboBoxColumn();
DataGridViewComboBoxColumn combo2 = new DataGridViewComboBoxColumn();
combo1.Name = "Col4";
combo1.Items.Add("100x100");
combo1.Items.Add("200x200");
combo2.Name = "Col5";
combo2.Items.Add("option1");
combo2.Items.Add("option2");
dataGridView1.Columns.Add(combo1);
dataGridView1.Columns.Add(combo2);
First add a row, cast columns, configure them and add them to the row. No Columns need to be previously specified in the designer.
You can use this solution for adding items to datagird view combobox column
DataSet ds; //class variable
public Form1()
{
InitializeComponent();
ds = new DataSet();
//column 1 (normal textColumn):
dataGridView1.Columns.Add("col1", "Column1");
//column 2 (comboBox):
DataGridViewComboBoxColumn comboCol = new DataGridViewComboBoxColumn();
comboCol.Name = "cmbColumn";
comboCol.HeaderText = "combobox column";
dataGridView1.Columns.Add(comboCol);
//using dataTable for each datasource:
for (int i = 0; i < 10; i++)
{
string text = "item " + i; //data for text
int[] data = { 1 * i, 2 * i, 3 * i }; //data for comboBox:
//create new dataTable:
DataTable table = new DataTable("table" + i);
table.Columns.Add("column1", typeof(string));
//fillig rows:
foreach (int item in data)
table.Rows.Add(item);
//add table to dataSet:
ds.Tables.Add(table);
//creating new row in dgv (text and comboBox):
CreateCustomComboBoxDataSouce(i, text, table);
}
}
private void CreateCustomComboBoxDataSouce(int row, string texst, DataTable table) //row index ,and two parameters
{
dataGridView1.Rows.Add(texst);
DataGridViewComboBoxCell comboCell = dataGridView1[1, row] as DataGridViewComboBoxCell;
comboCell.DataSource = new BindingSource(table, null);
comboCell.DisplayMember = "column1"; //name of column indataTable to display!!
comboCell.ValueMember = "column1"; // vlaue if needed
//(mostly you used these two propertes like: Name as DisplayMember, and Id as ValueMember)
}
if the above is not working take a look at the solution below..
you can do it via DataGridViewComboBoxCell. According to the cell's rowIndex, set different datasource(string[]) to the different DataGridViewComboBoxCell. Coding like this:
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
if (e.ColumnIndex == 0)
{
DataGridViewComboBoxCell combo = this.dataGridView1[0, e.RowIndex] as DataGridViewComboBoxCell;
if (e.RowIndex == 0)
{
//these data will be displayed in comboBox:
string[] data= {"item A1", "item B1", "item C1"};
combo.DataSource = data;
}
if (e.RowIndex == 1)
{
//these data will be displayed in comboBox:
string[] data = {"item A2", "item B2", "item C2"};
combo.DataSource = data;
}
if (e.RowIndex == 2)
{
//these data will be displayed in comboBox:
string[] data = { "item A3", "item B3", "item C3" };
combo.DataSource = data;
}
}
}
}
I'm not entirely clear what you're trying to do here, but if you're just trying to choose a value from the combobox for each row you add, you can choose an existing combobox value as a string.
If I have a two column datagridview, both with comboboxes that are pre-populated (I populated my comboboxes in the datagridview control itself by simply editing each column and adding my choices to the collection there), then I can do this:
Public Class Form1
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim newRow(1) As Object
newRow(0) = "Foo"
newRow(1) = "Bar"
DataGridView1.Rows.Add(newRow)
End Sub
End Class
So "Foo" and "Bar" are already choices in the comboboxes. I can populate each row by simply referring to the choice I want by name. I would guess I could also do this by index number if I wanted to.
Hope this helps!
If you need to keep configured columns try something like this:
dataGridView1.Rows.Add();
DataGridViewRow tmp = dataGridView1.Rows[dgvMatw.Rows.Count - 1];
tmp.Cells[0] = true;
tmp.Cells[1] = "str1";
tmp.Cells[2] = "str2";
((DataGridViewComboBoxCell)tmp.Cells[3]).Value = 1;
((DataGridViewComboBoxCell)tmp.Cells[4]).Value = 2;
Values 1 and 2 where example only. It must be type of your DataGridViewComboBoxColumn.ValueMember. I was searching for this topic, so I thought someone could use it.
来源：https://stackoverflow.com/questions/7704137/c-sharp-add-a-dgv-row-with-a-datagridviewcomboboxcell