Datagridview forcing only one checkbox to be selected in a column

问题

How do I force only a single checkbox to be checked in a column of a Datagridview?

回答1:

You will have to subscribe for the CellValueChanged event of the grid and depending on the check state of the current cell, loop the DataGridView and set true/false as Value for the other cells.

void grd_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
      if ((sender as DataGridView).CurrentCell is DataGridViewCheckBoxCell)
      {
           if (Convert.ToBoolean(((sender as DataGridView).CurrentCell as DataGridViewCheckBoxCell).Value))
           {
                   // Maybe have a method which does the
                    //loop and set value except for the current cell
            }
        }
}

回答2:

 private void grdRegClass_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        if (grdRegClass.Columns.IndexOf(grdRegClass.Columns["Status"]) == e.ColumnIndex)
        {
            int currentcolumnclicked = e.ColumnIndex;
            int currentrowclicked = e.RowIndex;
            foreach (DataGridViewRow dr in grdRegClass.Rows)
            {
                dr.Cells[currentcolumnclicked].Value = false;
            }
            grdRegClass.CurrentRow.Cells[currentrowclicked].Value = true;  
        }
    }

回答3:

    private void dataGridViewProduit_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        if ((sender as DataGridView).CurrentCell is DataGridViewCheckBoxCell)
        {
            if (Convert.ToBoolean(((sender as DataGridView).CurrentCell as DataGridViewCheckBoxCell).Value))
            {
                foreach (DataGridViewRow row in (sender as DataGridView).Rows)
                {
                    if (row.Index != (sender as DataGridView).CurrentCell.RowIndex && Convert.ToBoolean(row.Cells[e.ColumnIndex].Value) == true)
                    {
                        row.Cells[e.ColumnIndex].Value = false;
                    }
                }
            }
        }
    }

    private void dataGridViewClient_CurrentCellDirtyStateChanged(object sender, EventArgs e)
    {
        if (this.dataGridViewClient.IsCurrentCellDirty)
        {
            dataGridViewClient.CommitEdit(DataGridViewDataErrorContexts.Commit);
        }
    }

回答4:

You can use CellEndEdit event of DGV, as it occurs after when the cell is modified. Kindly read the comments in below code snippet to use the code below:

private void dgrvUserProfileView_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
    int CheckedCount = 0;

    //Make sure you have set True Value/ false Value property of check box column to 1/0 or true/false resp.
    //Lets say your column 5th(namely Department) is a checked box column
    if (dgrvUserProfileView.Columns[e.ColumnIndex].Name == "Department")
    {
        for (int i = 0; i <= dgrvUserProfileView.Rows.Count - 1; i++)
        {
            if (Convert.ToBoolean(dgrvUserProfileView.Rows[i].Cells["Department"].Value) == true)
            {
                CheckedCount = CheckedCount + 1;
            }
        }

        if (CheckedCount == 1)
        {
            for (int i = 0; i <= dgrvUserProfileView.Rows.Count - 1; i++)
            {
                if (Convert.ToBoolean(dgrvUserProfileView.Rows[i].Cells["Department"].Value) == true)
                {
                    dgrvUserProfileView.Rows[i].Cells["Department"].ReadOnly = true;
                }
            }
        }
        else
        {
            for (int i = 0; i <= dgrvUserProfileView.Rows.Count - 1; i++)
            {
                dgrvUserProfileView.Rows[i].Cells["Department"].ReadOnly = false;
            }
        }
    }
}

Hope this helps!

回答5:

private void dgvlist_CellContentClick(object sender, DataGridViewCellEventArgs e)  
    {  
        int currentcolumnclicked = e.ColumnIndex;  
        for (int i = 0; i <= dgvlist.Columns.Count - 1; i++)  
        {  
            if (dgvlist.Columns[i] is DataGridViewCheckBoxColumn)  
            {  
                if (Convert.ToString(dgvlist.CurrentRow.Cells[i].EditedFormattedValue) == "True" && i !=currentcolumnclicked)  
                {  
                    dgvlist.CurrentRow.Cells[i].Value = false;  
                }  
            }  
        }  
    }  

回答6:

private void dgvCaixa_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if ((sender as DataGridView).CurrentCell is DataGridViewCheckBoxCell)
            {
                foreach (DataGridViewRow row in dgvCaixa.Rows)
                {
                    if (row.Index != dgvCaixa.CurrentCell.RowIndex && Convert.ToBoolean(row.Cells[e.ColumnIndex].Value) == true)
                    {
                        row.Cells[e.ColumnIndex].Value = false;
                    }
                }
            }
        }

回答7:

in vb.net:

Private Sub DataGridViewJobsList_CellValueChanged(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridViewJobsList.CellValueChanged
    If TypeOf TryCast(sender, DataGridView).CurrentCell Is DataGridViewCheckBoxCell Then
        Dim cell1 As DataGridViewCell
        cell1 = TryCast(sender, DataGridView).CurrentCell
        If cell1.Value = True Then
            For Each row As DataGridViewRow In TryCast(sender, DataGridView).Rows
                If row.Index <> cell1.RowIndex AndAlso row.Cells(e.ColumnIndex).Value = "1" Then
                    row.Cells(e.ColumnIndex).Value = False
                End If
            Next
        End If
    End If
End Sub

Private Sub DataGridViewJobsList_CurrentCellDirtyStateChanged(sender As Object, e As EventArgs) Handles DataGridViewJobsList.CurrentCellDirtyStateChanged
    If Me.DataGridViewJobsList.IsCurrentCellDirty Then
        DataGridViewJobsList.CommitEdit(DataGridViewDataErrorContexts.Commit)
    End If
End Sub

回答8:

You can set the VirtualMode setting to TRUE on the DGV to allow only one checkbox. and you can set VirtualMode setting to FALSE on the DatagridView to check more than one.

I think this is the easiest way for the solution.

回答9:

private void dataGridView3_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == 1)
            {
                try
                {
                    string val = dataGridView3.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
                    if (val == "False")
                        val = "True";
                    else if (val == "True")
                        val = "False";
                    dataGridView3.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = val;

                for (int i = 0; i < dataGridView3.Rows.Count; i++)
                {
                    string active = "";
                    if (i != e.RowIndex)
                    {
                        if (val == "False")
                        {
                            dataGridView3.Rows[i].Cells[1].Value = "True";
                            active = "Y";
                        }
                        else if (val == "True")
                        {
                            dataGridView3.Rows[i].Cells[1].Value = "False";
                            active = "N";
                        }
                    }
                    else
                    {
                        if (val == "False")
                            active = "N";
                        else
                            active = "Y";
                    }




                }


            }
            catch (Exception ex)
            { }
        }
    }

来源：https://stackoverflow.com/questions/11466488/datagridview-forcing-only-one-checkbox-to-be-selected-in-a-column