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POTwo-way data binding with DataSet and ADO.NET
 

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  1. POTwo-way data binding with DataSet and ADO.NET
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    <p>I'm just beginning to explore WPF and its possibilities regarding data binding.</p> <p>I've got a sample Access database file and put its content into a <code>DataSet</code>. Then I bind the <code>DataSet</code> to a Grid (two way binding). What I want to achieve is to update the underlying database entry of the changed <code>DataSet</code>-Item. This is my code:</p> <pre><code>public partial class MainWindow : Window { DataSet sampleDataSet; OleDbDataAdapter adapter; public MainWindow() { InitializeComponent(); InitializeDB(); } private void InitializeDB() { string mdbFile = "./test.mdb"; string connString = string.Format( "Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}", mdbFile); OleDbConnection conn = new OleDbConnection(connString); adapter = new OleDbDataAdapter("SELECT * FROM Player;", conn); // ---------------------- // **EDIT** inserted update command OleDbCommand cmd = new OleDbCommand("UPDATE Player SET Name = @Name " + "WHERE ID = @ID", conn); cmd.Parameters.Add("@Name", OleDbType.VarChar, 40, "Name"); cmd.Parameters.Add("@ID", OleDbType.Char, 5, "ID"); // set the update command adapter.UpdateCommand = cmd; // **End of EDIT** // ---------------------- sampleDataSet = new DataSet("Player Table"); adapter.Fill(sampleDataSet, "Player"); data1.DataContext = sampleDataSet; } private void data1_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e) { if (e.EditAction == DataGridEditAction.Commit) { adapter.Update(sampleDataSet, "Player"); } } // Edit Comment April, 14th - Begin private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) { //sampleDataSet.AcceptChanges(); adapter.Update(sampleDataSet, "Player"); // Calling update again fixes it, but why? } // Edit Comment April, 14th - End } </code></pre> <p>My XAML looks like this:</p> <pre><code>&lt;Window x:Class="AdoTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;DataGrid Name="data1" AutoGenerateColumns="True" ItemsSource="{Binding Mode=TwoWay, Path=Player}" CellEditEnding="data1_CellEditEnding" /&gt; &lt;/Grid&gt; </code></pre> <p></p> <p>What is the approach to actually persist the changed values in the grid to the database file?</p>
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