使用剪切或复制从剪贴板粘贴文件 [英] Paste Files from Clipboard with Cut or Copy

问题描述

.NET Clipboard类具有一些方法，可以将文件放入剪贴板，并定义是否应移动或复制（剪切/复制）文件。

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

但是如果我想要粘贴文件到剪贴板，我看不出有没有办法使用标准剪贴板方法来剪切或复制文件。

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.

推荐答案

该信息存储在一个名为 Preferred DropEffect的剪贴板数据对象中。
包含4字节数组的内存流包含 System.Windows.DragDropEffects 的枚举值：

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:

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 aDropEffect = (MemoryStream)aDataDropEffect;
            byte[] aMoveEffect = new byte[4];
            aDropEffect.Read(aMoveEffect, 0, aMoveEffect.Length);
            var aDragDropEffects = (DragDropEffects)BitConverter.ToInt32(aMoveEffect, 0);
            aMove = aDragDropEffects.HasFlag(DragDropEffects.Move);
    }

    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
}

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