问题描述
我有一个问题，从Windows资源管理器将文件拖动到Windows窗体应用程序。
I'm having an issue dragging a file from Windows Explorer on to a Windows Forms application.
当我拖动文本它工作正常，但由于某些原因，它是不承认的文件。下面是我的测试代码：
It works fine when I drag text, but for some reason it is not recognizing the file. Here is my test code:
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_DragDrop(object sender, DragEventArgs e)
{
}
private void Form1_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
{
e.Effect = DragDropEffects.Copy;
}
else if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
e.Effect = DragDropEffects.Copy;
}
else
{
e.Effect = DragDropEffects.None;
}
}
}
}
的AllowDrop设置为true Form1上，正如我所提到的，它的工作原理，如果我拖动文本上的形式，只是没有实际的文件。
AllowDrop is set to true on Form1, and as I mentioned, it works if I drag text on to the form, just not an actual file.
我使用的是Vista的64比特...不知道如果这是问题的一部分。
I'm using Vista 64-bit ... not sure if that is part of the problem.
推荐答案
这个问题来自Vista的的。 DevStudio的是管理员身份运行，但探险家正在运行作为一个普通用户。当您从资源管理器将文件拖放到您DevStudio的托管应用，也就是同一个非特权用户试图用特权用户进行通信。这是不允许的。
The problem comes from Vista's UAC. DevStudio is running as administrator, but explorer is running as a regular user. When you drag a file from explorer and drop it on your DevStudio hosted application, that is the same as a non-privileged user trying to communicate with a privileged user. It's not allowed.
这可能不会显示出来，当你运行应用程序的调试程序之外。除非你运行它以管理员身份出现（或者Vista的自动检测，它的安装程序/设置应用）。
This will probably not show up when you run the app outside of the debugger. Unless you run it as an administrator there (or if Vista auto-detects that it's an installer/setup app).
您也可以时，至少进行检测。或禁用UAC（我不会推荐，因为你真的想在开发过程中捕获这些问题，而不是在部署过程中！）
You could also run explorer as an admin, at least for testing. Or disable UAC (which I would not recommend, since you really want to catch these issues during development, not during deployment!)
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