我是c#的新手,並試圖將datagridview綁定到visual studio 2010中的mssql數據庫。 數據綁定可以,一切似乎都有效。除了少數幾個莫名其妙的錯誤:併發衝突:UpdateCommand影響了預期的1條記錄中的0 0
我得到這個問題的錯誤後: 更新同一行的2倍, 刪除新插入的行, 更新行時的其他行已被刪除(文字修改後DeleteCommand)
我在Google上找到的所有解決方案都不適合我。我希望有人能幫助我。這裏是TE代碼:
private void fillDatagrid()
{
//fill datagrid ADO.NET
conn = new SqlConnection(TestApp.Properties.Settings.Default.TestdatabaseConnectionString);
cmd = conn.CreateCommand();
conn.Open();
cmd.CommandText = "SelectFrom";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@table", SqlDbType.NVarChar, 50).Value = "Countries";
cmd.Parameters.Add("@filters", SqlDbType.NVarChar, 300).Value = "";
adapt = new SqlDataAdapter(cmd);
dt = new DataTable();
adapt.Fill(dt);
dt.TableName = "Countries";
conn.Close();
BindingSource src = new BindingSource();
src.DataSource = dt;
dt.RowChanged += new DataRowChangeEventHandler(dt_RowChanged);
dgDatabaseGrid.DataSource = src;
dgDatabaseGrid.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
//dgDatabaseGrid.RowValidating += new DataGridViewCellCancelEventHandler(dgDatabaseGrid_RowValidating);
//disable columns:
dgDatabaseGrid.Columns[0].Visible = false;
dgDatabaseGrid.Columns["date_insert"].Visible = false;
dgDatabaseGrid.Columns["user_insert"].Visible = false;
dgDatabaseGrid.Columns["date_change"].Visible = false;
dgDatabaseGrid.Columns["user_change"].Visible = false;
dgDatabaseGrid.Columns["deleted"].Visible = false;
//auto size last column
dgDatabaseGrid.Columns["remarks"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
SqlCommandBuilder cb = new SqlCommandBuilder(adapt);
}
void dt_RowChanged(object sender, DataRowChangeEventArgs e)
{
try
{
adapt.Update(dt);
}
catch (SqlException ex)
{
Debug.WriteLine(ex.Message);
}
}
private void dgDatabaseGrid_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e)
{
if (!e.Row.IsNewRow)
{
DialogResult response = MessageBox.Show("Are you sure?", "Delete row?",
MessageBoxButtons.YesNo,
MessageBoxIcon.Question,
MessageBoxDefaultButton.Button2);
if (response == DialogResult.Yes)
{
//ipv delete --> deleted=1
conn.Open();
cmd = conn.CreateCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "DeleteFrom";
cmd.Parameters.Add("@table", SqlDbType.NVarChar, 50).Value = "Countries";
cmd.Parameters.Add("@id", SqlDbType.Int).Value = e.Row.Cells[0].Value;
cmd.ExecuteNonQuery();
conn.Close();
//delete from datagrid:
dt.Rows[dgDatabaseGrid.SelectedCells[0].RowIndex].Delete();
}
//always cancel!
e.Cancel = true;
}
}
你的回答正是我應該知道的,給我足夠的線索來解決我的問題。謝謝Henk。 – 2015-12-12 16:09:27