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PODataGrid Cell.Style binding
 

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    <p>I have a performance issue with the WPF DataGrid (.net 4.0)</p> <p>first, some details:</p> <ul> <li>I have a datagrid with an Observable collection as ItemsSource.</li> <li>this observableCollection itself contains collections of objects, each collection hence being a row, each object being a cell ("logical" cell of course, not actual dataGridCell)</li> </ul> <p>the reason why I do this is because I only know at runtime how many columns I will have in my dataGrid.</p> <ul> <li>then I bind each DataGridCell's value to the value of the object in the "logical" table (= the collection of collections)</li> </ul> <p>now the trouble I have is that I also have to be able to change whatever cell's Properties (like Background, Foreground, FontFamily, etc...) at any time while the app is running.</p> <p>The solution I came up with is one involving setting the columns' cellStyles with bindings that bind to the "logical" cells' properties</p> <p>here Is a sample code (no Xaml in my app):</p> <pre><code>public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); Width = 1200; Height = 780; Top = 60; Left = 200; DataGrid dg = new DataGrid(); Content = dg; ObservableCollection&lt;Row&gt; Source = new ObservableCollection&lt;Row&gt;(); dg.ItemsSource = Source; dg.SelectionMode = DataGridSelectionMode.Extended; dg.IsSynchronizedWithCurrentItem = true; dg.CanUserSortColumns = false; dg.CanUserReorderColumns = true; dg.CanUserResizeColumns = true; dg.CanUserResizeRows = true; dg.CanUserAddRows = false; dg.CanUserDeleteRows = false; dg.AutoGenerateColumns = false; dg.EnableColumnVirtualization = true; dg.EnableRowVirtualization = false; // unuseful in my case : I alawys have less lines than the DG can contain dg.VerticalScrollBarVisibility = ScrollBarVisibility.Visible; dg.GridLinesVisibility = DataGridGridLinesVisibility.None; dg.HorizontalGridLinesBrush = Brushes.LightGray; dg.MinRowHeight = 20; dg.RowHeaderWidth = 20; for (int i = 0; i &lt; 100; i++) { DataGridTextColumn column = new DataGridTextColumn(); column.Binding = new Binding(String.Format(CultureInfo.InvariantCulture, "[{0}].Text", i)); Style style = new Style(typeof(DataGridCell)); style.Setters.Add(new Setter(DataGridCell.BackgroundProperty, new Binding(String.Format(CultureInfo.InvariantCulture, "[{0}].Background", i)))); style.Setters.Add(new Setter(DataGridCell.ForegroundProperty, new Binding(String.Format(CultureInfo.InvariantCulture, "[{0}].Foreground", i)))); column.CellStyle = style; column.Header = "Column " + i; dg.Columns.Add(column); } for (int i = 0; i &lt; 35; i++) { Row dgRow = new Row(); Source.Add(dgRow); for (int j = 0; j &lt; 100; j++) dgRow.Add(new TextBox() { Text = "cell " + i + "/" + j, Background = Brushes.AliceBlue, Foreground = Brushes.BlueViolet }); } } } public class Row : ObservableCollection&lt;TextBox&gt; { } </code></pre> <p>my problem is: with the VolumnVirtualisation On (I don't need row Virtualization in my case), the grid takes about 2sec to load, and then 1sec each time I move the horizontal scrollbar by a big leap (clic in the scrollBar bg, not the arrow)</p> <p>this is too much for my purpose</p> <p>so my question is: am I doing something wrong and if yes, what? what better way to do this do I have?</p> <p>thanks for reading</p>
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