C# Convert DatagridViewTextbox to DataGridViewComboBoxCell-CodePudding

I have a DataGridView table that is already filled. Now, when I click on a cell in the DataGridView, I want to make a ComboBox out of the cell, where I can then choose a selection of "Items".

Dgv_Data_List is my DataGridView.

        private void Dgv_Data_List_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
    {
            DataGridViewComboBoxCell CboCell = new DataGridViewComboBoxCell();
            CboCell.Items.AddRange("Yes", "No");
            Dgv_Data_List.Rows[e.RowIndex].Cells[e.ColumnIndex] = CboCell;  <--At this point my program crashes
    }

I don't want any fixed comboboxes. They should be created at runtime as soon as they are needed.

CodePudding user response：

It is unclear how the grid is filled with data. You may get away with this if the columns and rows are manually added, however if the grid has a DataSource, then when you “double-click” into a cell and set the cell as a combo box as you show… then the “current” cells value better be a “Yes” or “No” or you will get the grids DataError complaining about the value in the cell not being a valid combo box value.

I would think you would have to “delete” the current cells value just to avoid the possible error. Something like…

DataGridViewComboBoxCell CboCell = new DataGridViewComboBoxCell();
CboCell.Items.AddRange("Yes", "No");
Dgv_Data_List.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = "";
Dgv_Data_List.Rows[e.RowIndex].Cells[e.ColumnIndex] = CboCell;

Setting the cells value to a blank string will work. HOWEVER, if the column type of the cells underlying data source is of a numeric type… then you will get the grids DataError complaining that the “Yes” or “No” value is not a valid numeric value… so technically this will ONLY work if the column type is a string type column. As most of this is unknown, I can only assume ALL the cells are of a string type.

CodePudding user response：

As the code given, you created comboboxcell but not convert the grid view. so do this instead.

this.dataGridView1[CboCell] = new DataGridViewComboBoxCell();

Try this in the place of creating the comboboxcell.