无法使用WPF Datagrid和DataAdapter更新本地数据库

Question

I'm trying to reflect the changes being made in the DataGrid to my local database (SQL Server Compact Edition, in this case) but it fails. Here is the code:

        SqlCeConnection conn;
        SqlCeDataAdapter dataAdapter;

        public MainWindow()
        {
        InitializeComponent();
        Init();
    }

    public void Init()
    {
        try
        {
            conn = new SqlCeConnection(@"Data Source = DataModel.sdf");
            dataAdapter = new SqlCeDataAdapter("Select * from Members", conn);
            SqlCeCommandBuilder commandBuilder = new SqlCeCommandBuilder(dataAdapter);
            DataTable dataTable = new DataTable();
            dataAdapter.Fill(dataTable);
            dataTable.RowChanged += dataTable_RowChanged;
            dataTable.RowDeleted += dataTable_RowDeleted;
            membersDataGrid.ItemsSource = dataTable.DefaultView;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }


    }

    void dataTable_RowDeleted(object sender, DataRowChangeEventArgs e)
    {
        dataAdapter.Update(sender as DataTable);
    }

    void dataTable_RowChanged(object sender, DataRowChangeEventArgs e)
    {
        dataAdapter.Update(sender as DataTable);

    }

membersDataGrid is the name of the DataGrid view in the UI. Have I done anything wrong? Thanks in advance :-)

Answer 1

This is the code that worked for me. It is similar to yours, except that uses my localDB database (not CE). Also, make sure to test your code outside VS, otherwise the database file may get over-written in your compile/execute cycle and you will never be able to see your changes reflected in the database.

private void DataGrid_Loaded(object sender, RoutedEventArgs e)
{
    string connstr = ConfigurationManager.ConnectionStrings["WpfApplication14.Properties.Settings.NorthwindConnectionString"].ToString();
    SqlConnection conn = new SqlConnection(connstr);
    CustomersTableAdapter adapter = new CustomersTableAdapter();
    NorthwindDataSet.CustomersDataTable table = new NorthwindDataSet.CustomersDataTable();

    adapter.Fill(table);
    dataGrid1.ItemsSource = table.DefaultView;

    table.RowChanged += table_RowChanged;
}

void table_RowChanged(object sender, System.Data.DataRowChangeEventArgs e)
{
    using (CustomersTableAdapter adapter = new CustomersTableAdapter())
    {
        adapter.Update(sender as NorthwindDataSet.CustomersDataTable);
    }
}