ARTICLE

Drag and Drop DataGrid Row in WPF

Posted by Raj Kumar Articles | WPF November 24, 2011
This article explains how to drag and drop a WPF DataGrid row in WPF.
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This article explains how to drag and drop selected DataGrid row in WPF.

Getting Started:

Creating WPF Project. Open Visual Studio 2010.

Go to File => New => Project

Select Window in installed templates

Select WPF Application

Enter the Name and choose the location.

Click OK

First of all add a new class using add new item tab and rename that class name.

using System.Collections.ObjectModel;

public class Product
    {
        public int ProductId { get; set; }
        public string ProductName { get; set; }
        public string ProductPrice { get; set; }
    }

    public class ProductCollection : ObservableCollection<Product>
    {
        public ProductCollection()
        {
            Add(new Product() { ProductId = 111, ProductName = "Books", ProductPrice = "500$" });
            Add(new Product() { ProductId = 222, ProductName = "Cameras", ProductPrice = "600$" });
            Add(new Product() { ProductId = 333, ProductName = "Cell Phones", ProductPrice = "700$" });
            Add(new Product() { ProductId = 444, ProductName = "Clothing", ProductPrice = "800$" });
            Add(new Product() { ProductId = 555, ProductName = "Shoes", ProductPrice = "900$" });
            Add(new Product() { ProductId = 666, ProductName = "Gift Cards", ProductPrice = "500$" });
            Add(new Product() { ProductId = 777, ProductName = "Crafts", ProductPrice = "400$" });
            Add(new Product() { ProductId = 888, ProductName = "Computers", ProductPrice = "430$" });
            Add(new Product() { ProductId = 999, ProductName = "Coins", ProductPrice = "460$" });
            Add(new Product() { ProductId = 332, ProductName = "Cars", ProductPrice = "4600$" });
            Add(new Product() { ProductId = 564, ProductName = "Boats", ProductPrice = "3260$" });
            Add(new Product() { ProductId = 346, ProductName = "Dolls", ProductPrice = "120$" });
            Add(new Product() { ProductId = 677, ProductName = "Gift Cards", ProductPrice = "960$" });

        }
    }


MainPage.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfRowDragDropSample"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="WpfRowDragDropSample.MainWindow"
        Title="MainWindow" Height="350" Width
="525">
    <Window.Resources>
        <local:ProductCollection x:Key="ProductList"/>
    </Window.Resources>
    <Grid DataContext="{Binding Source={StaticResource ProductList}}">
        <DataGrid d:LayoutOverrides="Width" Margin="0,28,0,0" Name="productsDataGrid"
                  AutoGenerateColumns="False" ItemsSource="{Binding}"
                  SelectionMode="Extended" ColumnWidth="*" AllowDrop
="True" >
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding ProductId}" Header="ProductId"></DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding ProductName}" Header="ProductName"></DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding ProductPrice}" Header="ProductPrice"></DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>
        <TextBlock TextWrapping="Wrap" Text="DataGrid Row Drag And Drop Sample" VerticalAlignment="Top" Margin="3,1,0,0" Height="24" HorizontalAlignment="Left" Width="268" FontSize="14.667" FontWeight="Bold" FontStyle="Italic"/>       
   
</Grid>
</
Window>

MainPage.xaml.cs

using System.Windows.Controls.Primitives;
 
public delegate Point GetPosition(IInputElement element);
        int rowIndex = -1;
        public MainWindow()
        {
            InitializeComponent();
            productsDataGrid.PreviewMouseLeftButtonDown += new MouseButtonEventHandler(productsDataGrid_PreviewMouseLeftButtonDown);
            productsDataGrid.Drop += new DragEventHandler(productsDataGrid_Drop);
        }

        void productsDataGrid_Drop(object sender, DragEventArgs e)
        {
            if (rowIndex < 0)
                return;
            int index = this.GetCurrentRowIndex(e.GetPosition);           
            if (index < 0)
                return;
            if (index == rowIndex)
                return;           
            if (index == productsDataGrid.Items.Count - 1)
            {
                MessageBox.Show("This row-index cannot be drop");
                return;
            }
            ProductCollection productCollection = Resources["ProductList"] as ProductCollection;
            Product changedProduct = productCollection[rowIndex];
            productCollection.RemoveAt(rowIndex);
            productCollection.Insert(index, changedProduct);
        }

        void productsDataGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            rowIndex = GetCurrentRowIndex(e.GetPosition);
            if (rowIndex < 0)
                return;
            productsDataGrid.SelectedIndex = rowIndex;
            Product selectedEmp = productsDataGrid.Items[rowIndex] as Product;
            if (selectedEmp == null)
                return;
            DragDropEffects dragdropeffects = DragDropEffects.Move;
            if (DragDrop.DoDragDrop(productsDataGrid, selectedEmp, dragdropeffects)
                                != DragDropEffects.None)
            {               
                productsDataGrid.SelectedItem = selectedEmp;
            }
        }

        private bool GetMouseTargetRow(Visual theTarget, GetPosition position)
        {
            Rect rect = VisualTreeHelper.GetDescendantBounds(theTarget);
            Point point = position((IInputElement)theTarget);
            return rect.Contains(point);           
        }

        private DataGridRow GetRowItem(int index)
        {
            if (productsDataGrid.ItemContainerGenerator.Status
                    != GeneratorStatus.ContainersGenerated)
                return null;
            return productsDataGrid.ItemContainerGenerator.ContainerFromIndex(index)
                                                            as DataGridRow;
        }

        private int GetCurrentRowIndex(GetPosition pos)
        {
            int curIndex = -1;
            for (int i = 0; i < productsDataGrid.Items.Count; i++)
            {
                DataGridRow itm = GetRowItem(i);
                if (GetMouseTargetRow(itm, pos))
                {
                    curIndex = i;
                    break;
                }
            }
            return curIndex;
        }

Run the application.

img1.jpg

Image 1.

Now select a row to drop on place of other row like I select computers product row to put on the top of the grid.

img2.jpg

Image 2.

Drag and drop selected row to other place.

img3.jpg

Image 3.

See now books row is under the computer row.
 

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