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Merge pull request #1 from SyncfusionExamples/ES-975464
ES-975464 - Resolve the ReadMe file length issue in this sample repository
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‎DragAndDrop.png‎

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‎README.md‎

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# How to drag and drop rows in wpf between treegrid and treeviewadv?
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This example illustrates how to drag and drop rows in wpf between treegrid and treeviewadv
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# How to Drag and Drop Rows between WPF TreeGrid and WPF TreeViewAdv?
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This example illustrates how to drag and drop rows in between [WPF TreeGrid](https://www.syncfusion.com/wpf-controls/treegrid) (SfTreeGrid) and [WPF TreeViewAdv](https://help.syncfusion.com/wpf/classic/treeview/overview).
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You can drag and drop the items between TreeViewAdv and TreeGrid by wiring the [Drop](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeGrid.TreeGridRowDragDropController.html#Syncfusion_UI_Xaml_TreeGrid_TreeGridRowDragDropController_Drop) and [DragStart](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeGrid.TreeGridRowDragDropController.html#Syncfusion_UI_Xaml_TreeGrid_TreeGridRowDragDropController_DragStart) events from the [TreeGridRowDragDropController](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeGrid.TreeGridRowDragDropController.html) class.
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``` c#
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private void RowDragDropController_DragStart(object sender, TreeGridRowDragStartEventArgs e)
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{
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e.Handled = true;
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var dataObject = new DataObject();
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dataObject.SetData("SourceTreeGrid", this.AssociatedObject.sfTreeGrid);
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dataObject.SetData("Nodes", e.DraggingNodes);
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foreach (var node in e.DraggingNodes)
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{
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if (node.HasChildNodes)
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{
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records.Add(node.Item as EmployeeInfo);
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GetChildNodes(node);
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}
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else
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{
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records.Add(node.Item as EmployeeInfo);
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}
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}
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dataObject.SetData(records);
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if(records!=null)
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DragDrop.DoDragDrop(this.AssociatedObject.sfTreeGrid, dataObject, DragDropEffects.Copy | DragDropEffects.Move);
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records.Clear();
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}
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private void RowDragDropController_Drop(object sender, TreeGridRowDropEventArgs e)
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{
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if (e.IsFromOutSideSource)
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{
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ObservableCollection<object> item = e.Data.GetData(typeof(ObservableCollection<object>)) as ObservableCollection<object>;
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var record = item[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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int nodeIndex = (int)rowIndex;
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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 = AssociatedObject.sfTreeGrid.GetNodeAtRowIndex(rowIndex);
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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 itemIndex = -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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newItem = new EmployeeInfo() { FirstName = record.FirstName, LastName = record.LastName, ID = record.ID, Salary = record.Salary, Title = record.Title, ReportsTo = -1 };
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else
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{
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var parent = 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 = parent.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 parent = 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 = parent.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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itemIndex = sourceCollection.IndexOf(data);
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if (dropPosition == "DropBelow")
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{
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itemIndex += 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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itemIndex = sourceCollection.Count;
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}
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sourceCollection.Insert(itemIndex, 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.treeview.ItemsSource as ObservableCollection<EmployeeInfo>).Remove(record as EmployeeInfo);
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}
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}
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```
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In TreeViewAdv, you need to wire the Drop event,
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``` c#
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private void Treeview_Drop(object sender, DragEventArgs e)
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{
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ObservableCollection<TreeNode> treeNodes = new ObservableCollection<TreeNode>();
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if (e.Data.GetDataPresent("Nodes"))
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treeNodes = e.Data.GetData("Nodes") as ObservableCollection<TreeNode>;
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EmployeeInfo item = new EmployeeInfo();
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if (treeNodes.Count == 0 || treeNodes == null)
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return;
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foreach (var node in treeNodes)
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{
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(AssociatedObject.sfTreeGrid.ItemsSource as ObservableCollection<EmployeeInfo>).Remove(node.Item as EmployeeInfo);
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}
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}
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```
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![Drag and drop between TreeGrid and TreeViewAdv](DragAndDrop.png)

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