c# - Excel VSTO 中的 Form.Show(IWin32Window) 方法在应用程序关闭时导致 ThreadAbortException

Question

我有一个 excel 加载项，我有一个表格，我想在 excel 窗口前显示。为此，我在 excel 功能区菜单按钮上使用 NativeWindow，如下所示:

public partial class MyRibbonMenu
{
    public List<Form> Forms = new List<Form>();

    private void button1_Click(object sender, RibbonControlEventArgs e)
    {
        // initialize form
        Form frm = new Form();
        frm.Text = "Test Form";
        Forms.Add(frm);

        // create the native window handle
        NativeWindow nw = new NativeWindow();
        IntPtr iptr = new IntPtr(Globals.ThisAddIn.Application.Hwnd);
        nw.AssignHandle(iptr);

        // when close the form release the handle
        frm.FormClosed += (sender2, e2) =>
        {
            Forms.Remove(frm);
            nw.ReleaseHandle();
        };

        // show with owner
        frm.Show(nw);
    }

}

如果我在退出 excel 之前关闭表单，一切正常，这非常有效。但是，如果用户想在不关闭打开的表单的情况下退出 excel，则会发生 ThreadAbortException 异常:

System.Windows.Forms.dll 中出现“System.Threading.ThreadAbortException”类型的未处理异常

附加信息:线程被中止。

为了解决这个问题，我尝试了以下代码但没有成功:

private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
{
    var frms = Globals.Ribbons.MyRibbonMenu.Forms.ToArray();
    foreach (var frm in frms)
    {
        frm.Close();
    }
}

哪里会出错？

Answer 1

我使用 IWin32Window 接口(interface)代替 NativeWindow 解决了这个问题:

public class Win32Window : System.Windows.Forms.IWin32Window
{
    public Win32Window(int windowHandle)
    {
        _windowHandle = new IntPtr(windowHandle);
    }

    IntPtr _windowHandle;

    public IntPtr Handle
    {
        get { return _windowHandle; }
    }
}

在此之后，我更改了下面的表单初始化代码:

private void button1_Click(object sender, RibbonControlEventArgs e)
{
    // initialize form
    var frm = new Form();
    frm.FormBorderStyle = FormBorderStyle.FixedSingle;
    frm.MinimizeBox = false;
    frm.MaximizeBox = false;
    frm.Text = "Test Form";
    frm.StartPosition = FormStartPosition.CenterScreen;
    Forms.Add(frm);

    // create the native window handle
    var nw = new Win32Window(Globals.ThisAddIn.Application.Hwnd);

    // show with owner
    frm.Show(nw);
}