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POBindingError 40 on DataGrid CellEditingTemplate
 

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  1. POBindingError 40 on DataGrid CellEditingTemplate
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    <p>I have a strange bug with my <code>DataTemplate</code> "<code>PersonDataTemplate</code>" I use it as <code>CellTemplate</code> and as<code>CellEditingTemplate</code>. On my <code>CellTemplate</code> all works fine but on my <code>CellEditingTemplate</code> I get following Error</p> <pre><code>System.Windows.Data Error: 40 : BindingExpression path error: 'PersonId' property not found on 'object' ''DataRowView' (HashCode=59318978)'. BindingExpression:Path=PersonId; DataItem='DataRowView' (HashCode=59318978); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String') System.Windows.Data Error: 40 : BindingExpression path error: 'PersonName' property not found on 'object' ''DataRowView' (HashCode=59318978)'. BindingExpression:Path=PersonName; DataItem='DataRowView' (HashCode=59318978); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String') </code></pre> <p>My Template</p> <pre><code> &lt;DataTemplate x:Key="PersonDataTemplate" DataType="Person"&gt; &lt;StackPanel&gt; &lt;TextBlock Background="LightBlue" Text="{Binding PersonId}"/&gt; &lt;TextBlock Background="AliceBlue" Text="{Binding PersonName}"/&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; </code></pre> <p>and here is the rest of my Code</p> <p><strong>Person.cs</strong></p> <pre><code> public class Person { private int personId; private string personName; public int PersonId { get { return personId; } set { personId = value; } } public string PersonName { get { return personName; } set { personName = value; } } } </code></pre> <p><strong>MainWindow.cs</strong></p> <pre><code>public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); simpleDataGrid.ItemsSource = LoadDataTable().AsDataView(); } /// &lt;summary&gt; /// Here i place my PersonDataTemplate as CellTemplate and CellEditingTemplate /// &lt;/summary&gt; private void simpleDataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e) { if (e.PropertyType == typeof(Person)) { MyDataGridTemplateColumn col = new MyDataGridTemplateColumn(); col.ColumnName = e.PropertyName; col.CellTemplate = (DataTemplate)FindResource("PersonDataTemplate"); col.CellEditingTemplate = (DataTemplate)FindResource("PersonDataTemplate"); e.Column = col; e.Column.Header = e.PropertyName; } } /// &lt;summary&gt; /// Here I create and fill my DataTable /// &lt;/summary&gt; private DataTable LoadDataTable() { var _simpleDataTable = new DataTable(); var person = new DataColumn("Person") { DataType = typeof(Person) }; _simpleDataTable.Columns.Add(person); var dr1 = _simpleDataTable.NewRow(); dr1[0] = new Person { PersonId = 1, PersonName = "TONY" }; _simpleDataTable.Rows.Add(dr1); var dr2 = _simpleDataTable.NewRow(); dr2[0] = new Person { PersonId = 2, PersonName = "MAL" }; _simpleDataTable.Rows.Add(dr2); _simpleDataTable.AcceptChanges(); return _simpleDataTable; } private void simpleDataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e) { // just to check the Values } } public class MyDataGridTemplateColumn : DataGridTemplateColumn { public string ColumnName { get; set; } protected override System.Windows.FrameworkElement GenerateElement(DataGridCell cell, object dataItem) { // The DataGridTemplateColumn uses ContentPresenter with your DataTemplate. ContentPresenter cp = (ContentPresenter)base.GenerateElement(cell, dataItem); // Reset the Binding to the specific column. The default binding is to the DataRowView. BindingOperations.SetBinding(cp, ContentPresenter.ContentProperty, new Binding(this.ColumnName)); return cp; } } </code></pre> <p><strong>MainWindow.XAML</strong></p> <pre><code>&lt;Window x:Class="HowBindDataTableToDataGrid.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;Window.Resources&gt; &lt;!-- you for each Class one DataTemplate--&gt; &lt;DataTemplate x:Key="PersonDataTemplate" DataType="Person"&gt; &lt;StackPanel&gt; &lt;TextBlock Background="LightBlue" Text="{Binding PersonId}"/&gt; &lt;TextBlock Background="AliceBlue" Text="{Binding PersonName}"/&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;DataGrid Name="simpleDataGrid" AutoGeneratingColumn="simpleDataGrid_AutoGeneratingColumn" BeginningEdit="simpleDataGrid_BeginningEdit" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p><strong>Special Information's</strong></p> <ul> <li>My ItemsSource is a DataTable</li> <li>My <code>MyDataGridTemplateColumn</code> based on <a href="https://stackoverflow.com/a/5355195/1993545">this</a> Answer (I also tested the other solution with no luck)</li> <li>I also tested a separate DataTemplate for my <code>CellEditingTemplate</code> with no luck</li> </ul>
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