以编程方式关闭SaveFileDialog/OpenFileDialog，不使用pinvoke &g

Question

由于一些要求，我必须以编程方式关闭SaveFileDialog，而不使用PINVOKE。

是否有其他方法关闭SaveFileDialog使用PINVOKE的方式?我曾试图关闭SaveFileDialog的所有者形式，但SaveFileDialog仍然在那里。

我尝试过的:

1. 关闭执行SaveFileDialog的ShowDialog()的表单
2. SaveFileDialog.Dispose()

Answer 1

关闭传递给ShowDialog(owner);方法的owner窗口应该可以工作。例如:

private static Form CreateDummyForm(Form owner) {
Form dummy = new Form();
IntPtr hwnd = dummy.Handle; // force handle creation
if (owner != null) {
dummy.Owner = owner;
dummy.Location = owner.Location;
owner.LocationChanged += delegate {
dummy.Location = owner.Location;
};
}
return dummy;
}
[STAThread]
static void Main() {
Form form = new Form();
form.Size = new Size(400,400);
Button btn = new Button { Text = "btn" };
btn.Click += delegate {
SaveFileDialog fsd = new SaveFileDialog();
int timeoutMillis = 5000;
Form dummy = CreateDummyForm(form); // Close disposes the dummy form
Task.Delay(TimeSpan.FromMilliseconds(timeoutMillis)).ContinueWith((t) => { dummy.Close(); dummy.Dispose(); }, TaskScheduler.FromCurrentSynchronizationContext());
fsd.ShowDialog(dummy);
fsd.Dispose();
};
form.Controls.Add(btn);
Application.Run(form);
}

Answer 2

如果你使用visual studio designer来添加一个SaveFileDialog，你的表单将在你的表单生命周期内拥有一个带有这个对话框的字段。

只在需要时创建SaveFileDialog更有效，更容易。如果在using语句中这样做，就不必处理它，当然也不需要PInvoke

private void MenuItem_FileSaveAs_Clicked(object sender, ...)
{
using (var dlg = new SaveFileDialog())
{
dlg.FileName = this.FileName;
dlg.InitialDirectory = ...
dlg.DefaultExt = ...
...
// Show the SaveFileDialog, and if Ok save the file
var dlgResult = dlg.ShowDialog(this);
if (dlgResult == DialogResult.OK)
{
// operator selected a file and pressed OK
this.FileName = dlg.FileName;
this.SaveFile(this.FileName);
}
}
}