多文件属性在XP上不起作用

Question

我使用c＃使用Windows SHMultiFileProperties函数显示多个文件的属性对话框。

但是，它在Windows 7上运行良好，但在XP上没有显示对话框。实际上，函数返回零，所以它甚至不是错误。

我只能认为问题出在发送给函数的IDataObject中（我在answer中找到了代码）：

var data = new DataObject();
var files = new StringCollection() { @"T:\Test.doc" };
data.SetFileDropList(files);
data.SetData("Preferred DropEffect", true, new MemoryStream(new byte[] { 5, 0, 0, 0 }));
data.SetData("Shell IDList Array", true, CreateShellIDList(files));
Clipboard.SetDataObject(data, true);


 [DllImport("shell32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr ILCreateFromPath(string path);
 [DllImport("shell32.dll", CharSet = CharSet.None)]
 public static extern void ILFree(IntPtr pidl);
 [DllImport("shell32.dll", CharSet = CharSet.None)]
 public static extern int ILGetSize(IntPtr pidl);

private static MemoryStream CreateShellIDList(StringCollection filenames)
{
// first convert all files into pidls list
int pos = 0;
byte[][] pidls = new byte[filenames.Count][];
foreach (var filename in filenames)
{
    // Get pidl based on name
    IntPtr pidl = ILCreateFromPath(filename);
    int pidlSize = ILGetSize(pidl);
    // Copy over to our managed array
    pidls[pos] = new byte[pidlSize];
    Marshal.Copy(pidl, pidls[pos++], 0, pidlSize);
    ILFree(pidl);
}

// Determine where in CIDL we will start pumping PIDLs
int pidlOffset = 4 * (filenames.Count + 2);
// Start the CIDL stream
var memStream = new MemoryStream();
var sw = new BinaryWriter(memStream);
// Initialize CIDL witha count of files
sw.Write(filenames.Count);
// Calcualte and write relative offsets of every pidl starting with root
sw.Write(pidlOffset);
pidlOffset += 4; // root is 4 bytes
foreach(var pidl in pidls)
{
    sw.Write(pidlOffset);
    pidlOffset += pidl.Length;
}

// Write the root pidl (0) followed by all pidls
sw.Write(0);
foreach(var pidl in pidls) sw.Write(pidl);
// stream now contains the CIDL
return memStream;

}