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POWinForms Interop, Drag & Drop from WinForms -> WPF
 

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    <p>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.</p> <p>Trying the same thing but from Winforms to Winforms works fine. (See example code below)</p> <p>I need help on making this work... have any clues what I'm doing wrong?</p> <p>Thanks!</p> <hr> <p>Example:<br> In the sample code below, I'm just trying to drag a custom MyContainerClass object created when initating the drag on the label control on a 1) System.Windows.Forms.TextBox (Winforms) and 2) System.Windows.TextBox (WPF, added to an ElementHost). </p> <p>Case 1) works fine but case 2) is crashing when trying to retrieve the drop data using GetData(). GetDataPresent("WindowsFormsApplication1.MyContainerClass") returns "true" so In theory, I should be able to retrive my drop data of that type like in Winforms. </p> <p>Here is the stack trace of the crash: </p> <pre> "Error HRESULT E_FAIL has been returned from a call to a COM component" with the following stack trace: at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo) at System.Windows.Forms.DataObject.GetDataIntoOleStructs(FORMATETC& formatetc, STGMEDIUM& medium) at System.Windows.Forms.DataObject.System.Runtime.InteropServices.ComTypes.IDataObject.GetDataHere(FORMATETC& formatetc, STGMEDIUM& medium) at System.Windows.Forms.DataObject.System.Runtime.InteropServices.ComTypes.IDataObject.GetData(FORMATETC& formatetc, STGMEDIUM& medium) at System.Windows.DataObject.OleConverter.GetDataInner(FORMATETC& formatetc, STGMEDIUM& medium) at System.Windows.DataObject.OleConverter.GetDataFromOleHGLOBAL(String format, DVASPECT aspect, Int32 index) at System.Windows.DataObject.OleConverter.GetDataFromBoundOleDataObject(String format, DVASPECT aspect, Int32 index) at System.Windows.DataObject.OleConverter.GetData(String format, Boolean autoConvert, DVASPECT aspect, Int32 index) at System.Windows.DataObject.OleConverter.GetData(String format, Boolean autoConvert) at System.Windows.DataObject.GetData(String format, Boolean autoConvert) at System.Windows.DataObject.GetData(String format) at WindowsFormsApplication1.Form1.textBox_PreviewDragEnter(Object sender, DragEventArgs e) in WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs:line 48 </pre> <p>Here is some code:</p> <pre><code>// -- 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; } } </code></pre>
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