blocks|key|863215|text|您可以尝试在已加载的事件中获取MainWindow，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863216|private+void+Window_Loaded(object+sender,+RoutedEventArgs+e)
{
++++Application+curApp+=+Application.Current;
++++Window+mainWindow+=+curApp.MainWindow;
++++this.Left+=+mainWindow.Left+%2B+(mainWindow.Width+-+this.ActualWidth)+/+2;
++++this.Top+=+mainWindow.Top+%2B+(mainWindow.Height+-+this.ActualHeight)+/+2;
}|code-block|syntax|javascript|863217|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can try to get a hold of the MainWindow in the Loaded event like this

<pre><code>private void Window_Loaded(object sender, RoutedEventArgs e)
{
 Application curApp = Application.Current;
 Window mainWindow = curApp.MainWindow;
 this.Left = mainWindow.Left + (mainWindow.Width - this.ActualWidth) / 2;
 this.Top = mainWindow.Top + (mainWindow.Height - this.ActualHeight) / 2;
}
</code></pre>

blocks|key|1078017|text|在属于该对话框的XAML中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1078018|<Window+...+WindowStartupLocation="CenterOwner">|code-block|syntax|javascript|1078019|在C#中，当您实例化对话框时：|1078020|MyDlg+dlg+=+new+MyDlg();
dlg.Owner+=+this;

if+(dlg.ShowDialog()+==+true)
{
++++...|1078021|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In the XAML belonging to the Dialog:

<pre><code>&lt;Window ... WindowStartupLocation="CenterOwner"&gt;
</code></pre>

and in C# when you instantiate the Dialog:

<pre><code>MyDlg dlg = new MyDlg();
dlg.Owner = this;

if (dlg.ShowDialog() == true)
{
 ...
</code></pre>

blocks|key|1077860|text|我认为使用xaml标记更容易|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1077861|<Window+WindowStartupLocation="CenterOwner">|code-block|syntax|javascript|1077862|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I think it's easier to use xaml markup

<pre><code>&lt;Window WindowStartupLocation="CenterOwner"&gt;
</code></pre>

blocks|key|1078131|text|只是在代码后面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1078132|public+partial+class+CenteredWindow:Window
{
++++public+CenteredWindow()
++++{
++++++++InitializeComponent();

++++++++WindowStartupLocation+=+WindowStartupLocation.CenterOwner;
++++++++Owner+=+Application.Current.MainWindow;
++++}
}|code-block|syntax|javascript|1078133|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just in code behind.

<pre><code>public partial class CenteredWindow:Window
{
 public CenteredWindow()
 {
 InitializeComponent();

 WindowStartupLocation = WindowStartupLocation.CenterOwner;
 Owner = Application.Current.MainWindow;
 }
}
</code></pre>

blocks|key|1078335|text|我认为每个人对这个问题的回答都是答案应该是什么的一部分。我将简单地把它们放在一起，我相信这是解决这个问题最简单和优雅的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1078336|首先设置窗口所在的位置。这就是店主。|1078337|<Window+WindowStartupLocation="CenterOwner">|code-block|syntax|javascript|1078338|在打开窗口之前，我们需要提供它的所有者，并且从另一篇文章中，我们可以使用当前应用程序的MainWindow的静态getter来访问MainWindow。|1078339|++++++++Window+window+=+new+Window();
++++++++window.Owner+=+Application.Current.MainWindow;
++++++++window.Show();|1078340|就这样。|1078341|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I think everyone's answers to this question are parts to what the answer should be. I will simply put them together which I believe is the easiest and elegant approach to this problem. 

First setup where you want the window to be located. Here it's the owner.

<pre><code>&lt;Window WindowStartupLocation="CenterOwner"&gt;
</code></pre>

Before opening the window we need to give it the owner and from another post we can access the MainWindow using the static getter for the current application's MainWindow.

<pre><code> Window window = new Window();
 window.Owner = Application.Current.MainWindow;
 window.Show();
</code></pre>

That's it.

blocks|key|863448|text|我发现这个最好|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863449|frmSample+fs+=+new+frmSample();
fs.Owner+=+this;+//+<-----
fs.WindowStartupLocation+=+WindowStartupLocation.CenterOwner;
var+result+=+fs.ShowDialog();|code-block|syntax|javascript|863450|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I found this one the best

<pre><code>frmSample fs = new frmSample();
fs.Owner = this; // &lt;-----
fs.WindowStartupLocation = WindowStartupLocation.CenterOwner;
var result = fs.ShowDialog();
</code></pre>

blocks|key|863791|text|如果您几乎无法控制需要显示的窗口，则以下代码片段可能会很有用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863792|++++public+void+ShowDialog(Window+window)
++++{
++++++++Dispatcher.BeginInvoke(
++++++++++++new+Func<bool?>(()+=>
++++++++++++{
++++++++++++++++window.Owner+=+Application.Current.MainWindow;
++++++++++++++++window.WindowStartupLocation+=+WindowStartupLocation.CenterOwner;
++++++++++++++++return+window.ShowDialog();
++++++++++++}));
++++}|code-block|syntax|javascript|863793|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you have little control over the windows which you need to show, the following snippet may be useful

<pre><code> public void ShowDialog(Window window)
 {
 Dispatcher.BeginInvoke(
 new Func&lt;bool?&gt;(() =&gt;
 {
 window.Owner = Application.Current.MainWindow;
 window.WindowStartupLocation = WindowStartupLocation.CenterOwner;
 return window.ShowDialog();
 }));
 }
</code></pre>

blocks|key|863350|text|为了让WPF对话框位于Windows窗体父窗体的中心，我将父窗体传递给该对话框，因为Application.Current没有返回Windows窗体父窗体(我假设它只有在父应用程序是WPF的情况下才有效)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863351|public+partial+class+DialogView+:+Window
{
++++private+readonly+System.Windows.Forms.Form+_parent;

++++public+DialogView(System.Windows.Forms.Form+parent)
++++{
++++++++InitializeComponent();

++++++++_parent+=+parent;
++++}

++++private+void+Window_Loaded(object+sender,+RoutedEventArgs+e)
++++{
++++++++this.Left+=+_parent.Left+%2B+(_parent.Width+-+this.ActualWidth)+/+2;
++++++++this.Top+=+_parent.Top+%2B+(_parent.Height+-+this.ActualHeight)+/+2;
++++}
}|code-block|syntax|javascript|863352|在WPF对话框上设置WindowStartupLocation：|863353|<Window+WindowStartupLocation="CenterParent">|863354|Windows窗体加载WPF对话框的方式如下所示：|863355|DialogView+dlg+=+new+DialogView();
dlg.Owner+=+this;

if+(dlg.ShowDialog()+==+true)
{
++++...|863356|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

To get a WPF Dialog to position at the centre of a Windows Forms parent form I passed the parent form to the dialog since Application.Current didn't return the Windows Form parent (I assume it only works if the parent app is WPF).

<pre><code>public partial class DialogView : Window
{
 private readonly System.Windows.Forms.Form _parent;

 public DialogView(System.Windows.Forms.Form parent)
 {
 InitializeComponent();

 _parent = parent;
 }

 private void Window_Loaded(object sender, RoutedEventArgs e)
 {
 this.Left = _parent.Left + (_parent.Width - this.ActualWidth) / 2;
 this.Top = _parent.Top + (_parent.Height - this.ActualHeight) / 2;
 }
}
</code></pre>

set the WindowStartupLocation on the WPF Dialog:

<pre><code>&lt;Window WindowStartupLocation="CenterParent"&gt;
</code></pre>

and the way the Windows Form loads the WPF dialog is like this:

<pre><code>DialogView dlg = new DialogView();
dlg.Owner = this;

if (dlg.ShowDialog() == true)
{
 ...
</code></pre>

blocks|key|863266|text|必须将父窗口设置为窗口(所有者)，然后将WindowStartupLocation属性设置为"CenterParent“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863267|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You must set a parent window to your window (Owner) and then set the WindowStartupLocation property to "CenterParent"

blocks|key|863389|text|我想补充一下Fredrik+Hedblad的响应，如果MainWindows已经调整大小或最大化，结果将是错误的，因为mainWindow.Width和mainWindow.Height反映了在XAML上设置的值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863390|如果需要实际值，可以使用mainWindow.ActualWidth和mainWindow.ActualHeight：|863391|private+void+Window_Loaded(object+sender,+RoutedEventArgs+e)
++++{
++++++++Application+curApp+=+Application.Current;
++++++++Window+mainWindow+=+curApp.MainWindow;
++++++++this.Left+=+mainWindow.Left+%2B+(mainWindow.ActualWidth+-+this.ActualWidth)+/+2;
++++++++this.Top+=+mainWindow.Top+%2B+(mainWindow.ActualHeight+-+this.ActualHeight)+/+2;
++++}|code-block|syntax|javascript|863392|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I'd like to add to the Fredrik Hedblad response that if the MainWindows has been resized or maximized, the result would be wrong, because mainWindow.Width and mainWindow.Height reflect the value that are set on the XAML.

If you want the actual values, you can use mainWindow.ActualWidth and mainWindow.ActualHeight:

<pre><code>private void Window_Loaded(object sender, RoutedEventArgs e)
 {
 Application curApp = Application.Current;
 Window mainWindow = curApp.MainWindow;
 this.Left = mainWindow.Left + (mainWindow.ActualWidth - this.ActualWidth) / 2;
 this.Top = mainWindow.Top + (mainWindow.ActualHeight - this.ActualHeight) / 2;
 }
</code></pre>

blocks|key|863461|text|XAML：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863462|++++<Window+WindowStartupLocation="CenterScreen">|code-block|syntax|javascript|863463|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

XAML:

<pre><code> &lt;Window WindowStartupLocation="CenterScreen"&gt;
</code></pre>

blocks|key|1078260|text|如果您不想在xaml中使用WindowStartupLocation属性，则此代码有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1078261|private+void+CenterWindowOnApplication()
{
++++System.Windows.Application+curApp+=+System.Windows.Application.Current;
++++Window+mainWindow+=+curApp.MainWindow;
++++if+(mainWindow.WindowState+==+WindowState.Maximized)
++++{
++++++++//+Get+the+mainWindow's+screen:
++++++++var+screen+=+System.Windows.Forms.Screen.FromRectangle(new+System.Drawing.Rectangle((int)mainWindow.Left,+(int)mainWindow.Top,+(int)mainWindow.Width,+(int)mainWindow.Height));
++++++++double+screenWidth+=+screen.WorkingArea.Width;
++++++++double+screenHeight+=+screen.WorkingArea.Height;
++++++++double+popupwindowWidth+=+this.Width;
++++++++double+popupwindowHeight+=+this.Height;
++++++++this.Left+=+(screenWidth+/+2)+-+(popupwindowWidth+/+2);
++++++++this.Top+=+(screenHeight+/+2)+-+(popupwindowHeight+/+2);
++++}
++++else
++++{
++++++++this.Left+=+mainWindow.Left+%2B+((mainWindow.ActualWidth+-+this.ActualWidth)+/+2;
++++++++this.Top+=+mainWindow.Top+%2B+((mainWindow.ActualHeight+-+this.ActualHeight)+/+2);
++++}
}|code-block|syntax|javascript|1078262|我使用"screen.WorkingArea“是因为任务栏会让mainWindow变小。如果你想把窗口放在屏幕的中间，你可以用"screen.Bounds“代替。|1078263|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This code works if you don't want to use the WindowStartupLocation property in xaml:

<pre><code>private void CenterWindowOnApplication()
{
 System.Windows.Application curApp = System.Windows.Application.Current;
 Window mainWindow = curApp.MainWindow;
 if (mainWindow.WindowState == WindowState.Maximized)
 {
 // Get the mainWindow's screen:
 var screen = System.Windows.Forms.Screen.FromRectangle(new System.Drawing.Rectangle((int)mainWindow.Left, (int)mainWindow.Top, (int)mainWindow.Width, (int)mainWindow.Height));
 double screenWidth = screen.WorkingArea.Width;
 double screenHeight = screen.WorkingArea.Height;
 double popupwindowWidth = this.Width;
 double popupwindowHeight = this.Height;
 this.Left = (screenWidth / 2) - (popupwindowWidth / 2);
 this.Top = (screenHeight / 2) - (popupwindowHeight / 2);
 }
 else
 {
 this.Left = mainWindow.Left + ((mainWindow.ActualWidth - this.ActualWidth) / 2;
 this.Top = mainWindow.Top + ((mainWindow.ActualHeight - this.ActualHeight) / 2);
 }
}
</code></pre>

I am using "screen.WorkingArea" because the task bar makes the mainWindow smaller.
If you want to place the window in the middle of the screen, you can use "screen.Bounds" instead.

blocks|key|863711|text|对于子窗口，设置为XAML|type|unstyled|depth|inlineStyleRanges|entityRanges|data|863712|WindowStartupLocation="CenterOwner"|code-block|syntax|javascript|863713|要调用子窗口作为父窗口的对话框和中心，请从父窗口调用它，例如|863714|private+void+ConfigButton_OnClick(object+sender,+RoutedEventArgs+e)
{
++++var+window+=+new+ConfigurationWindow
++++{
++++++++Owner+=+this
++++};
++++window.ShowDialog();
}|863715|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For the child window, set at the XAML 

<pre><code>WindowStartupLocation="CenterOwner"
</code></pre>

To call your child window as a dialog and center of the parent, call it from the parent window, e.g

<pre><code>private void ConfigButton_OnClick(object sender, RoutedEventArgs e)
{
 var window = new ConfigurationWindow
 {
 Owner = this
 };
 window.ShowDialog();
}
</code></pre>

How to set Dialog's position that came from <code>.ShowDialog();</code> to show at the center of the mainWindows.

This is the way I try to set position.

<pre><code>private void Window_Loaded(object sender, RoutedEventArgs e)
{ 
 PresentationSource source = PresentationSource.FromVisual(this);
 if (source != null)
 {
 Left = ??
 Top = ??
 }
}
</code></pre>

WPF : How to set a Dialog position to show at the center of the application?

Windows

如何将来自.ShowDialog();的对话框的位置设置为显示在mainWindows的中心。这是我尝试设置位置的方式。private void Window_Loaded(object sender, RoutedEventArgs e){            PresentationSource source = PresentationSource.FromVisual(this);   

问如何将对话框位置设置为显示在应用程序的中心？
EN

回答 13

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问如何将对话框位置设置为显示在应用程序的中心？EN

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问如何将对话框位置设置为显示在应用程序的中心？
EN