从 DataGridView 中删除列

Question

I have a database that has a Users table and I present the data in a DataGridView. I would like to remove 4 columns, but the code I have (referenced from MSDN) seems to append the columns at the end. How can I totally REMOVE the columns?

So this is how the DGV looks without the columns removed

The Code I use to TRY and remove the columns

RadarServerEntities rse = new RadarServerEntities();
gvUsers.DataSource = rse.Users;

gvUsers.Columns.Remove("ID");
gvUsers.Columns.Remove("InsertDate");
gvUsers.Columns.Remove("Connections");
gvUsers.Columns.Remove("MachineID");

The result

I would like to get rid of the last 4 columns, so why isnt my code doing it?

Many Thanks :)

Answer 1

I tend to just hide the fields instead.

gvUsers.Columns["ID"].Visibility = false;

Et cetera.

Answer 2

你也可以使用gvUsers.Columns.RemoveAt(IndexOfColumn);

Answer 3

if you don't want to create the columns automatically when you bind your DataSource , you need to set gvUsers.AutoGenerateColumns = false;

RadarServerEntities rse = new RadarServerEntities();
gvUsers.AutoGenerateColumns = false;
gvUsers.DataSource = rse.Users;

Answer 4

To actually remove automatically generated column you have to turn off automatic generation after data binding.

So the code would be:

RadarServerEntities rse = new RadarServerEntities();
gvUsers.DataSource = rse.Users;
gvUsers.AutoGenerateColumns = false;
gvUsers.Columns.Remove("ID");
gvUsers.Columns.Remove("InsertDate");
gvUsers.Columns.Remove("Connections");
gvUsers.Columns.Remove("MachineID");

I haven't checked what exactly happens, but probably the moment DGV becomes visible, missing columns are re-autogenerated.

So with this solution you have columns generated at the moment of binding data, then you turn it off and remove columns that you don't need. Missing columns can't be re-generated.

Answer 5

DataGridViewColumn DataGridViewColumnSelected;   
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
                    if (e.ColumnIndex !=-1 && e.RowIndex == -1)
                    {
                        DataGridViewColumnSelected = dataGridView1.Columns[e.ColumnIndex] as DataGridViewColumn;

                    }
}

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            bool bHandled = false;
            switch (keyData)
            {
                case Keys.Delete:
                    if (DataGridViewColumnSelected != null)
                    {
                        this.dataGridView1.Columns.RemoveAt(DataGridViewColumnSelected.Index);
                        //dataGridView1.Columns[DataGridViewColumnSelected.Name].Visible = false;  // case of just hiding the column
                    }
                    break;
            }
            return bHandled;
        }

Answer 6

I think you have to Modify DataTable before passing it to DGV

as follow:

RadarServerEntities rse = new RadarServerEntities();
rse.Users.Columns.Remove("ID");
rse.Users.Columns.Remove("InsertDate");
rse.Users.Columns.Remove("Connections");
rse.Users.Columns.Remove("MachineID");
dgvUsers.DataSource=rse.Users;

this method worked for me

Answer 7

If what you want is to remove from a DataGridView is the column you have selected then this code is for you.

Place this code in the delete button and ready to delete the column you have selected.

int rowIndex = TuDataGrigView1.CurrentCell.RowIndex;
TuDataGrigView1.Rows.RemoveAt(rowIndex);