我的工作统一游戏工具，在那里你需要拖放文件从资源管理器，处理那里，并拖放回资源管理器，记事本，油漆或其他东西。
问题：我不能在资源管理器或其他地方放置文件，但我可以"复制"文件到左侧栏或滚动条的空白区域。
无法复制文件和文件夹空间：https://i.stack.imgur.com/J4DBU.png
可以"复制"到空白空间：https://i.stack.imgur.com/ZdaYD.png
可以"复制"到滚动条：https://i.stack.imgur.com/2rWDd.png

private void StartDrag()
{ 
    var data = new DataObject();
    var ls = new System.Collections.Specialized.StringCollection();
    ls.Add("C:/ExeMask.log");
    data.SetFileDropList(ls);

    OleInitialize(null);

    int[] array = new int[1];
    DoDragDrop(data, new DropSource(), (int)DragDropEffects.Copy, array);

    OleUninitialize();
}

[DllImport("ole32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern int OleInitialize(Action lpVoid);

[DllImport("ole32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern void OleUninitialize();

[DllImport("ole32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern int DoDragDrop(System.Runtime.InteropServices.ComTypes.IDataObject dataObject, IOleDropSource dropSource, int allowedEffects, int[] finalEffect);

[ComImport]
[Guid("00000121-0000-0000-C000-000000000046")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleDropSource
{
    [PreserveSig]
    int OleQueryContinueDrag(int fEscapePressed, [In][MarshalAs(UnmanagedType.U4)] int grfKeyState);

    [PreserveSig]
    int OleGiveFeedback([In][MarshalAs(UnmanagedType.U4)] int dwEffect);
}

public class DropSource : IOleDropSource
{
    public DropSource()
    {

    }

    public int OleQueryContinueDrag(int fEscapePressed, [In, MarshalAs(UnmanagedType.U4)] int grfKeyState)
    {
        QueryContinueDragEventArgs qcdevent = null;
        bool escapePressed = fEscapePressed != 0;
        DragAction cancel = DragAction.Continue;
        if (escapePressed)
        {
            cancel = DragAction.Cancel;
        }
        else if ((((grfKeyState & 1) == 0) && ((grfKeyState & 2) == 0)) && ((grfKeyState & 0x10) == 0))
        {
            cancel = DragAction.Drop;
        }
        qcdevent = new QueryContinueDragEventArgs(grfKeyState, escapePressed, cancel);
        //this.peer.OnQueryContinueDrag(qcdevent);
        switch (qcdevent.Action)
        {
            case DragAction.Drop:
                return 0x40100;

            case DragAction.Cancel:
                return 0x40101;
        }
        return 0;
    }

    public int OleGiveFeedback([In, MarshalAs(UnmanagedType.U4)] int dwEffect)
    {

        GiveFeedbackEventArgs gfbevent = new GiveFeedbackEventArgs((DragDropEffects)dwEffect, true);
        //this.peer.OnGiveFeedback(gfbevent);
        if (gfbevent.UseDefaultCursors)
        {
            return 0x40102;
        }
        return 0;
    }
}

我尝试了：

• 调用和不调用OleInitialize和OleUninitialize
• 导入与WinForms在Unity中使用的完全相同的System.Windows.Forms.dll（由于在Unity中找不到CIL而无法导入）
• new Control（）. DoDragDrop-相同的结果（但我使用的dll不完全相同）
• 以管理员身份运行应用程序。

也许有一些库，可以开始拖放没有自己的图形用户界面-只需调用方法和繁荣!拖放启动？我看到了c++的解决方案，但我很糟糕。