Paste Files from Clipboard with Cut or Copy

问题

The .NET Clipboard class has methods to put files into the clipboard and also define if they should be moved or copied (cut/copy).

But if I want to paste files that were copied into the clipboard, I see no way to find out if the file was cut or copied with standard Clipboard methods.

回答1:

The information is stored in a Clipboard data object named "Preferred DropEffect". A memory stream containing a 4-byte-array contains the enum value for System.Windows.DragDropEffects in the first byte:

public static void PasteFilesFromClipboard(string aTargetFolder)
{
    var aFileDropList = Clipboard.GetFileDropList();
    if (aFileDropList == null || aFileDropList.Count == 0) return;

    bool aMove = false;

    var aDataDropEffect = Clipboard.GetData("Preferred DropEffect");
    if (aDataDropEffect != null)
    {
        MemoryStream dropEffect = (MemoryStream)aDataDropEffect;
        byte[] moveEffect = new byte[4];
        dropEffect.Read(moveEffect, 0, moveEffect.Length);
        aMove = moveEffect[0] == 2;
    }

    foreach (string aFileName in aFileDropList)
    {
        if (aMove) { } // Move File ...
        else { } // Copy File ...
    }
}

[Flags]
public enum DragDropEffects
{
    Scroll = int.MinValue,
    All = -2147483645,
    None = 0,
    Copy = 1,
    Move = 2,
    Link = 4
}

来源：https://stackoverflow.com/questions/57787840/paste-files-from-clipboard-with-cut-or-copy