Drag and Drop from Winforms to WPF (in elementhost): WPF, Winforms, ElementHost

Drag and Drop from Winforms to WPF (in elementhost)

Hi Experts,

I'm trying to drag data from the Winforms portion of my application on a WPF controls that's contained inside an "ElementHost". And it crashes when I try doing so.

Trying the same thing but from Winforms to Winforms works fine.

I need help on making this work... have any clues what I'm doing wrong?

Thanks!

// -- Add an ElementHost to your form --
// -- Add a label to your form --
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
 
            System.Windows.Controls.TextBox textBox = new System.Windows.Controls.TextBox();
            textBox.Text = "WPF TextBox";
            textBox.AllowDrop = true;
            elementHost2.Child = textBox;
            textBox.PreviewDragEnter += new System.Windows.DragEventHandler(textBox_PreviewDragEnter);
 
            System.Windows.Forms.TextBox wfTextBox = new System.Windows.Forms.TextBox();
            wfTextBox.Text = "Winforms TextBox";
            wfTextBox.AllowDrop = true;
            wfTextBox.DragEnter += new DragEventHandler(wfTextBox_DragEnter);
            Controls.Add(wfTextBox);
        }
 
        void wfTextBox_DragEnter(object sender, DragEventArgs e)
        {
            bool dataPresent = e.Data.GetDataPresent("WindowsFormsApplication1.MyContainerClass");
 
            // NO CRASH here!
            object data = e.Data.GetData("WindowsFormsApplication1.MyContainerClass");
        }
 
        void textBox_PreviewDragEnter(object sender, System.Windows.DragEventArgs e)
        {
            bool dataPresent = e.Data.GetDataPresent("WindowsFormsApplication1.MyContainerClass");
 
            // Crash appens here!!
            // {"Error HRESULT E_FAIL has been returned from a call to a COM component."}
            object data = e.Data.GetData("WindowsFormsApplication1.MyContainerClass");
        }
 
        private void label1_MouseDown(object sender, MouseEventArgs e)
        {
            label1.DoDragDrop(new MyContainerClass(label1.Text), DragDropEffects.Copy);
        }
    }
 
    public class MyContainerClass
    {
        public object Data { get; set; }
 
        public MyContainerClass(object data)
        {
            Data = data;
        }
    }

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Drag and Drop from Winforms to WPF (in elementhost)

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