How to delete a selected DataGridViewRow and update a connected database table?

2022-12-16 13:08 问答作者：

I have a DataGridView control on a Windows Forms application (written with C#).

What I need is: when a user selects a DataGridViewRow, and then clicks on a 'Delete' button, the row should be deleted and next, the database needs to be updated using table adapters.

This is what I have so far:

private void btnDelete_Click(object sender, EventArgs e)
{
    if (this.dataGridView1.SelectedRows.Count > 0)
    {
        dataGridView1.Rows.RemoveAt(th开发者_运维百科is.dataGridView1.SelectedRows[0].Index);
    }                
}

Furthermore, this only deletes one row. I would like it where the user can select multiple rows.

This code removes selected items of dataGridView1:

 private void btnDelete_Click(object sender, EventArgs e)
 {
     foreach (DataGridViewRow item in this.dataGridView1.SelectedRows)
     {
         dataGridView1.Rows.RemoveAt(item.Index);
     }
 }

private void buttonRemove_Click(object sender, EventArgs e)
{
    foreach (DataGridViewCell oneCell in dataGridView1.SelectedCells)
    {
        if (oneCell.Selected)
            dataGridView1.Rows.RemoveAt(oneCell.RowIndex);
    }
}

Removes rows which indexes are in selected cells. So, select any cells, and their corresponding rows will be removed.

I have written the following code, please take a look:

foreach (DataGridViewRow row in dataGridView1.SelectedRows)
    if (!row.IsNewRow) dataGridView1.Rows.Remove(row);

using the Index of the selected row still could work; see if the code below will do the trick:

int selectedCount = dataGridView1.SelectedRows.Count;           
while (selectedCount > 0)
{
    if (!dataGridView1.SelectedRows[0].IsNewRow)
        dataGridView1.Rows.RemoveAt(dataGridView1.SelectedRows[0].Index);
    selectedCount--;
}

I hope this helps, regards.

private void btnDelete_Click(object sender, EventArgs e)
{
    if (e.ColumIndex == 10)// 10th column the button
    {
        dataGridView1.Rows.Remove(dataGridView1.Rows[e.RowIndex]);
    }                
}

This solution can be delete a row (not selected, clicked row!) via "e" param.

maybe you can use temp list for delete. for ignore row index change

<pre>
private void btnDelete_Click(object sender, EventArgs e)
{
    List<int> wantdel = new List<int>();
    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        if ((bool)row.Cells["Select"].Value == true)
        wantdel.Add(row.Index);
    }

    wantdel.OrderByDescending(y => y).ToList().ForEach(x =>
    {
        dataGridView1.Rows.RemoveAt(x);
    });           
}
</pre>

To delete multiple rows in datagrid, c#

parts of my code:

private void btnDelete_Click(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in datagrid1.SelectedRows)
        {
            //get key
            int rowId = Convert.ToInt32(row.Cells[0].Value);

            //avoid updating the last empty row in datagrid
            if (rowId > 0)
            {
                //delete 
                aController.Delete(rowId);

                //refresh datagrid
                datagrid1.Rows.RemoveAt(row.Index); 
            }  
        }
    }




 public void Delete(int rowId)
        {
            var toBeDeleted = db.table1.First(c => c.Id == rowId);
            db.table1.DeleteObject(toBeDeleted);
            db.SaveChanges();

        }

private: System::Void button9_Click(System::Object^  sender, System::EventArgs^  e)
{
    String^ constring = L"datasource=localhost;port=3306;username=root;password=password";
    MySqlConnection^ conDataBase = gcnew MySqlConnection(constring);
    conDataBase->Open();
    try 
    {
        if (MessageBox::Show("Sure you wanna delete?", "Warning", MessageBoxButtons::YesNo) == System::Windows::Forms::DialogResult::Yes)
        {
            for each(DataGridViewCell^ oneCell in dataGridView1->SelectedCells)
            {
                if (oneCell->Selected) {
                    dataGridView1->Rows->RemoveAt(oneCell->RowIndex);
                    MySqlCommand^ cmdDataBase1 = gcnew MySqlCommand("Delete from Dinslaken_DB.Configuration where Memory='ORG 6400H'");
                    cmdDataBase1->ExecuteNonQuery();
                    //sda->Update(dbdataset);
                }   
            }           
        }
    }
    catch (Exception^ex)
    {
        MessageBox::Show(ex->ToString());
    }
}

Well, this is how I usually delete checked rows by the user from a DataGridView, if you are associating it with a DataTable from a Dataset (ex: DataGridView1.DataSource = Dataset1.Tables["x"]), then once you will make any updates (delete, insert,update) in the Dataset, it will automatically happen in your DataGridView.

if (MessageBox.Show("Are you sure you want to delete this record(s)", "confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == System.Windows.Forms.DialogResult.Yes)
        {
            try
            {
                for (int i = dgv_Championnat.RowCount -1; i > -1; i--)
                {
                    if (Convert.ToBoolean(dgv_Championnat.Rows[i].Cells[0].Value) == true)
                    {
                        Program.set.Tables["Champ"].Rows[i].Delete();
                    }
                }
                Program.command = new SqlCommandBuilder(Program.AdapterChampionnat);
                if (Program.AdapterChampionnat.Update(Program.TableChampionnat) > 0)
                {
                    MessageBox.Show("Well Deleted");
                }
            }
            catch (SqlException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

have a look this way:

if (MessageBox.Show("Sure you wanna delete?", "Warning", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes)
{
  foreach (DataGridViewRow item in this.dataGridView1.SelectedRows)
  {
      bindingSource1.RemoveAt(item.Index);
  }
      adapter.Update(ds);
 }

Try this:

if (dgv.SelectedRows.Count>0)
{
    dgv.Rows.RemoveAt(dgv.CurrentRow.Index);
}

if(this.dgvpurchase.Rows.Count>1)
{
    if(this.dgvpurchase.CurrentRow.Index<this.dgvpurchase.Rows.Count)
    {
        this.txtname.Text = this.dgvpurchase.CurrentRow.Cells[1].Value.ToString();
        this.txttype.Text = this.dgvpurchase.CurrentRow.Cells[2].Value.ToString();
        this.cbxcode.Text = this.dgvpurchase.CurrentRow.Cells[3].Value.ToString();
        this.cbxcompany.Text = this.dgvpurchase.CurrentRow.Cells[4].Value.ToString();
        this.dtppurchase.Value = Convert.ToDateTime(this.dgvpurchase.CurrentRow.Cells[5].Value);
        this.txtprice.Text = this.dgvpurchase.CurrentRow.Cells[6].Value.ToString();
        this.txtqty.Text = this.dgvpurchase.CurrentRow.Cells[7].Value.ToString();
        this.txttotal.Text = this.dgvpurchase.CurrentRow.Cells[8].Value.ToString();
        this.dgvpurchase.Rows.RemoveAt(this.dgvpurchase.CurrentRow.Index);
        refreshid();
    }
}

You delete first from the database and then you update your datagridview: