如何设置已动态添加到datagridview的组合框的索引

Question

So here is a bit of backstory to try and put things into context

First off the format of the data: I have two databases that are structured like this

DB1 this table contains the Field_Id , along with all of the properties of the field DB2 this table contains broader information along with references to DB1 Field_Id , that reference is used for getting the Field_Name

so simple sql query to better describe

Select Field_Name From DB1 Where Field_Id = (select Field_Id From DB2 where param = %)

this returns a list that gets bound to a DataGridViewComboBox inside of a datatable. Now up to this point everything goes great, the ComboBox get added the whole DataGridView gets filled the issue arises here

for (int i = 0; i <= dataGridView1.RowCount - 2; i++)
        {
            dataGridView1.Rows[i].Cells[0].Value = valuetosetindex;
            dataGridView1.Refresh();
        }

The thing is this doesnt set the value of the ComboBox inside of the 0th column, if I were to just set the columns to strings it works but the value set doesnt work.

Im more than happy to add more code if needed.

Answer 1

With your code snippet you are going to add an invalid value to the object which results in an ArgumentException .

Like you have already mentioned, if you assign a string to the value it is working. You only have to access the valuetosetindex element of the ComboBox :

dataGridView1.Rows[i].Cells[0].Value = yourColumn.Items[valuetosetindex];

In this code snippet yourColumn is your ComboBox which is bound to the column.

Answer 2

How is your Datagridview bound to data? I would suggest to use a Dataset and a BindingSource to tie it togehter. If you bind it you can choose to use a ComboBox as a column type. Then you can bind a second dataset to that Combobox. this would automatically create the link.