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Merge pull request #4 from SyncfusionExamples/ES-975464
ES-975464 - Resolve the ReadMe file length issue in this sample repository
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‎DragDropDataGridToTreeGrid.png‎

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‎README.md‎

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# How to drag and drop rows between datagrid and listview in wpf?
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This example illustrates how to drag and drop rows between datagrid and listview in wpf
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# How to Drag and Drop Rows Between WPF DataGrid and WPF TreeGrid?
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This example illustrates how to drag and drop rows between [WPF DataGrid](https://www.syncfusion.com/wpf-controls/datagrid) (SfDataGrid) and [WPF TreeGrid](https://www.syncfusion.com/wpf-controls/treegrid) (SfTreeGrid).
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To perform the dragging operation between DataGrid and TreeGrid by using the [GridRowDragDropController.Drop](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.Grid.GridRowDragDropController.html#Syncfusion_UI_Xaml_Grid_GridRowDragDropController_Drop) and [TreeGridRowDragDropController.Drop](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeGrid.TreeGridRowDragDropController.html#Syncfusion_UI_Xaml_TreeGrid_TreeGridRowDragDropController_Drop) events.
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``` c#
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this.sfDataGrid.RowDragDropController.Drop += sfDataGrid_Drop;
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this.sfTreeGrid.RowDragDropController.Drop += sfTreeGrid_Drop;
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/// <summary>
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/// Customized TreeGrid Drop event.
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void sfTreeGrid_Drop(object sender, TreeGridRowDropEventArgs e)
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{
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if (e.IsFromOutSideSource)
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{
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var draggingRecord = e.Data.GetData("Records") as ObservableCollection<object>;
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var record = draggingRecord[0] as EmployeeInfo;
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var dropPosition = e.DropPosition.ToString();
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var newItem = new EmployeeInfo();
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var rowIndex =AssociatedObject.sfTreeGrid.ResolveToRowIndex(e.TargetNode.Item);
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if (dropPosition != "None" && rowIndex != -1)
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{
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if (AssociatedObject.sfTreeGrid.View is TreeGridSelfRelationalView)
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{
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var treeNode = e.TargetNode;
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if (treeNode == null)
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return;
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var data = treeNode.Item;
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AssociatedObject.sfTreeGrid.SelectionController.SuspendUpdates();
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var dropIndex = -1;
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TreeNode parentNode = null;
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if (dropPosition == "DropBelow" || dropPosition == "DropAbove")
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{
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parentNode = treeNode.ParentNode;
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if (parentNode == null)
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{
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var treeNodeItem = treeNode.Item as EmployeeInfo;
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newItem = new EmployeeInfo() { FirstName = record.FirstName, LastName = record.LastName, ID = record.ID, Salary = record.Salary, Title = record.Title, ReportsTo = treeNodeItem.ReportsTo };
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}
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else
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{
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var parentNodeItems = parentNode.Item as EmployeeInfo;
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newItem = new EmployeeInfo() { FirstName = record.FirstName, LastName = record.LastName, ID = record.ID, Salary = record.Salary, Title = record.Title, ReportsTo = parentNodeItems.ID };
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}
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}
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else if (dropPosition == "DropAsChild")
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{
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if (!treeNode.IsExpanded)
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AssociatedObject.sfTreeGrid.ExpandNode(treeNode);
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parentNode = treeNode;
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var parentNodeItems = parentNode.Item as EmployeeInfo;
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newItem = new EmployeeInfo() { FirstName = record.FirstName, LastName = record.LastName, ID = record.ID, Salary = record.Salary, Title = record.Title, ReportsTo = parentNodeItems.ID };
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}
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IList sourceCollection = null;
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if (dropPosition == "DropBelow" || dropPosition == "DropAbove")
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{
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if (treeNode.ParentNode != null)
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{
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var collection = AssociatedObject.sfTreeGrid.View.GetPropertyAccessProvider().GetValue(treeNode.ParentNode.Item, AssociatedObject.sfTreeGrid.ChildPropertyName) as IEnumerable;
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sourceCollection = GetSourceListCollection(collection);
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}
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else
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{
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sourceCollection = GetSourceListCollection(AssociatedObject.sfTreeGrid.View.SourceCollection);
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}
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dropIndex = sourceCollection.IndexOf(data);
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if (dropPosition == "DropBelow")
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{
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dropIndex += 1;
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}
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}
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else if (dropPosition == "DropAsChild")
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{
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var collection = AssociatedObject.sfTreeGrid.View.GetPropertyAccessProvider().GetValue(data, AssociatedObject.sfTreeGrid.ChildPropertyName) as IEnumerable;
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sourceCollection = GetSourceListCollection(collection);
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if (sourceCollection == null)
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{
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var list = data.GetType().GetProperty(AssociatedObject.sfTreeGrid.ChildPropertyName).PropertyType.CreateNew() as IList;
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if (list != null)
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{
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AssociatedObject.sfTreeGrid.View.GetPropertyAccessProvider().SetValue(treeNode.Item, AssociatedObject.sfTreeGrid.ChildPropertyName, list);
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sourceCollection = list;
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}
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}
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dropIndex = sourceCollection.Count;
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}
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sourceCollection.Insert(dropIndex, newItem);
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AssociatedObject.sfTreeGrid.SelectionController.ResumeUpdates();
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(AssociatedObject.sfTreeGrid.SelectionController as TreeGridRowSelectionController).RefreshSelection();
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e.Handled = true;
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}
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}
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AssociatedObject.sfDataGrid.View.Remove(record);
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}
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}
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/// <summary>
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/// Gets the source collection of TreeGrid
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/// </summary>
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/// <param name="collection"></param>
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/// <returns></returns>
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private IList GetSourceListCollection(IEnumerable collection)
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{
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IList list = null;
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if (collection == null)
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collection = AssociatedObject.sfTreeGrid.View.SourceCollection;
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if ((collection as IList) != null)
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{
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list = collection as IList;
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}
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return list;
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}
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/// <summary>
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/// Customize the Drop event.restrict the certain record and Drop position from drop.
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void sfDataGrid_Drop(object sender, GridRowDropEventArgs e)
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{
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if (e.IsFromOutSideSource)
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{
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var draggingRecord = e.Data.GetData("Nodes") as ObservableCollection<TreeNode>;
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var record = draggingRecord[0].Item as EmployeeInfo;
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int dropIndex = (int)e.TargetRecord;
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var dropPosition = e.DropPosition.ToString();
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if (record.Title == "Manager")
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{
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e.Handled = true;
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return;
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}
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IList collection = null;
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collection = AssociatedObject.sfDataGrid.View.SourceCollection as IList;
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if (dropPosition == "DropAbove")
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{
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dropIndex--;
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collection.Insert(dropIndex, record);
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}
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else
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{
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dropIndex++;
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collection.Insert(dropIndex, record);
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}
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AssociatedObject.sfTreeGrid.View.Remove(record);
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e.Handled = true;
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}
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}
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```
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![Drag and drop between DataGrid and TreeGrid](DragDropDataGridToTreeGrid.png)

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