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WPF DataGrid: Reordering Rows?

WPF DataGrid: Reordering Rows with Drag and Drop

The WPF DataGrid control provides a powerful and flexible way to display and manipulate data in a tabular format. One common requirement for DataGrids is the ability to reorder rows using drag and drop. This can be achieved using the DataGrid's built-in drag-and-drop functionality or by implementing a custom solution.

Using the Built-in Drag-and-Drop Functionality

The DataGrid control has built-in drag-and-drop support that allows you to reorder rows by simply dragging and dropping them to a new position. To enable this functionality, you need to set the CanUserReorderRows property of the DataGrid to true.

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Once you have enabled drag-and-drop, you can reorder rows by clicking on the row header and dragging it to a new position. The DataGrid will automatically update the order of the rows in the underlying data source.

Implementing a Custom Solution

In some cases, you may need to implement a custom drag-and-drop solution for your DataGrid. This could be necessary if you need to control the appearance of the drag feedback or if you need to perform additional actions when a row is dropped.

To implement a custom drag-and-drop solution, you can use the DataGrid's PreviewMouseLeftButtonDown and PreviewMouseMove events. The PreviewMouseLeftButtonDown event is raised when the user clicks the left mouse button on a row header. The PreviewMouseMove event is raised when the user moves the mouse while the left mouse button is down.

In the PreviewMouseLeftButtonDown event handler, you can check if the user clicked on a row header. If they did, you can start a drag-and-drop operation by calling the DoDragDrop method of the DataGrid.

```html private void DataGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { var dataGrid = (DataGrid)sender; var rowHeader = e.OriginalSource as DataGridRowHeader; if (rowHeader != null) { var row = rowHeader.DataContext as DataRow; if (row != null) { DragDropEffects dragDropEffects = DragDropEffects.Move; DataObject dataObject = new DataObject(typeof(DataRow), row); dataGrid.DoDragDrop(dataObject, dragDropEffects); } } } ```

In the PreviewMouseMove event handler, you can check if the drag-and-drop operation is ongoing. If it is, you can update the appearance of the drag feedback or perform other necessary actions.

```html private void DataGrid_PreviewMouseMove(object sender, MouseEventArgs e) { var dataGrid = (DataGrid)sender; if (dataGrid.IsDragDropInProgress) { // Update the appearance of the drag feedback or perform other necessary actions. } } ```

When the user drops the row, the Drop event of the DataGrid will be raised. In the Drop event handler, you can obtain the data object that was dropped and update the underlying data source accordingly.

```html private void DataGrid_Drop(object sender, DragEventArgs e) { var dataGrid = (DataGrid)sender; if (e.Data.GetDataPresent(typeof(DataRow))) { var row = (DataRow)e.Data.GetData(typeof(DataRow)); // Update the underlying data source. } } ```

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