如何在C＃中设置和获取数据绑定Gridview组合框列的值

Question

I have a data grid view with combo box column in it, i have bind that column to datatable like this:

 ((grdItems.Columns[1]) as DataGridViewComboBoxColumn).DataSource = dt;
 ((grdItems.Columns[1]) as DataGridViewComboBoxColumn).DisplayMember = "LocationName";
 ((grdItems.Columns[1]) as DataGridViewComboBoxColumn).ValueMember = "Id";

now i can get the selected value like this:

var value = grdItems.Rows[0][1].Value;

but the issue is, when i manually add the rows in the gridview (without binding the grid), i cant get the value of the combobox cell. i am adding rows like this:

grdItems.Rows.Add(1, 1, "Some Value");

when i use var value = grdItems.Rows[0][1].Value; this method to get the value, i returns me the text of the cell not the value ie 1 in this case.

How can i solve this issue? since i want the value of the cell in case of adding rows manually, as well as data-bind rows.

Answer 1

Am assuming that by manually adding rows you mean from the UI , so one way to get the value of the newly added row is to use an event handler for the events raised when you add an row. You may use one of the following 1) RowsAdded https://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.rowsadded(v=vs.110).aspx 2) RowPrePaint - https://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.rowprepaint(v=vs.110).aspx - not used this much but is also an option

this.myGridView.RowsAdded += new DataGridViewRowsAddedEventHandler(myGridView_RowsAdded);

 private void myGridView_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
{
    var newRow = this.myGridView.Rows[e.RowIndex];
}

Edit: Based on the actual requirement stated in the comments - actual requirement being retrieving the newly added row's cell value (Id) corresponding to the combox box column on button save clicked event

Assuming you have bound the combo box to a data source itself , meaning, your

 combobox.DataSource=someList

so what you can do is write a linq query

 someList.Where( v=>v.Text.Equals("row.Cells[1].Value")).FirstOrDefault().Id