关于 c#:Shut Down Dialog From A Thread

Shut Down Dialog From A Thread

我有一个在 c# windows 窗体下运行的应用程序。
当用户退出应用程序时，我想让用户关闭计算机。
我的应用程序有点复杂，但以下是我的问题的一个很好的例子：

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public partial class Form1 : Form
{
public class shell32
{
[DllImport("shell32", EntryPoint ="#60")]
private static extern int SHShutDownDialog(long p);

public static void ShutDownDialog()
{
int x = SHShutDownDialog(0);
}
}

private Thread _eventHandler;
private System.Windows.Forms.Button btnShutDown;

public Form1()
{
InitializeComponent();

AddSDButton();
SetAndStartThread();
}

private void AddSDButton()
{
this.btnShutDown = new System.Windows.Forms.Button();
this.SuspendLayout();
this.btnShutDown.Location = new System.Drawing.Point(50, 50);
this.btnShutDown.Name ="btnShutDown";
this.btnShutDown.Size = new System.Drawing.Size(75, 25);
this.btnShutDown.TabIndex = 0;
this.btnShutDown.Text ="Shut Down";
this.btnShutDown.UseVisualStyleBackColor = true;
this.btnShutDown.Click += new System.EventHandler(this.btnShutDown_Click);

this.Controls.Add(this.btnShutDown);
}

private void SetAndStartThread()
{
_eventHandler = new Thread(new ThreadStart(this.EventHandler));
_eventHandler.IsBackground = true;
_eventHandler.Start();
}

protected void EventHandler()
{
try
{
while (true)
{
//DO SOMETHING..
Thread.Sleep(5000);
shell32.ShutDownDialog();
}
}
catch (ThreadAbortException)
{
return;
}
}

private void btnShutDown_Click(object sender, EventArgs e)
{
shell32.ShutDownDialog();
}

}

使用 btnShutDown_Click 通过表单调用关闭对话框可以正常工作。但是，正在运行的线程调用 shell32.ShutDownDialog 失败。 SHShutDownDialog 返回一个负值。
有什么想法吗？