将WindowStyle属性设置为None，这将隐藏控制框和标题栏。不需要内核调用。

WPF没有一个内置的属性来隐藏标题栏的关闭按钮，但是你可以用几行P/Invoke来做到这一点。

首先，将这些声明添加到Window类中:

private const int GWL_STYLE = -16;
private const int WS_SYSMENU = 0x80000;
[DllImport("user32.dll", SetLastError = true)]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

然后把下面的代码放到Window的Loaded事件中:

var hwnd = new WindowInteropHelper(this).Handle;
SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);

这样就没有关闭按钮了。你也不会在标题栏的左边有一个窗口图标，这意味着没有系统菜单，即使你右键单击标题栏——它们都在一起。

重要提示:所有这些都是隐藏按钮。用户仍然可以关闭窗口!如果用户按下Alt+F4，或者通过任务栏关闭应用程序，窗口仍然会关闭。

如果你不想让窗口在后台线程完成之前关闭，那么你也可以覆盖OnClosing并将Cancel设置为true，就像Gabe建议的那样。

我刚遇到类似的问题，乔怀特的解决方案似乎对我来说简单而干净。我重用了它，并将其定义为Window的附加属性

public class WindowBehavior
{
    private static readonly Type OwnerType = typeof (WindowBehavior);

    #region HideCloseButton (attached property)

    public static readonly DependencyProperty HideCloseButtonProperty =
        DependencyProperty.RegisterAttached(
            "HideCloseButton",
            typeof (bool),
            OwnerType,
            new FrameworkPropertyMetadata(false, new PropertyChangedCallback(HideCloseButtonChangedCallback)));

    [AttachedPropertyBrowsableForType(typeof(Window))]
    public static bool GetHideCloseButton(Window obj) {
        return (bool)obj.GetValue(HideCloseButtonProperty);
    }

    [AttachedPropertyBrowsableForType(typeof(Window))]
    public static void SetHideCloseButton(Window obj, bool value) {
        obj.SetValue(HideCloseButtonProperty, value);
    }

    private static void HideCloseButtonChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var window = d as Window;
        if (window == null) return;

        var hideCloseButton = (bool)e.NewValue;
        if (hideCloseButton && !GetIsHiddenCloseButton(window)) {
            if (!window.IsLoaded) {
                window.Loaded += HideWhenLoadedDelegate;
            }
            else {
                HideCloseButton(window);
            }
            SetIsHiddenCloseButton(window, true);
        }
        else if (!hideCloseButton && GetIsHiddenCloseButton(window)) {
            if (!window.IsLoaded) {
                window.Loaded -= ShowWhenLoadedDelegate;
            }
            else {
                ShowCloseButton(window);
            }
            SetIsHiddenCloseButton(window, false);
        }
    }

    #region Win32 imports

    private const int GWL_STYLE = -16;
    private const int WS_SYSMENU = 0x80000;
    [DllImport("user32.dll", SetLastError = true)]
    private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
    [DllImport("user32.dll")]
    private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

    #endregion

    private static readonly RoutedEventHandler HideWhenLoadedDelegate = (sender, args) => {
        if (sender is Window == false) return;
        var w = (Window)sender;
        HideCloseButton(w);
        w.Loaded -= HideWhenLoadedDelegate;
    };

    private static readonly RoutedEventHandler ShowWhenLoadedDelegate = (sender, args) => {
        if (sender is Window == false) return;
        var w = (Window)sender;
        ShowCloseButton(w);
        w.Loaded -= ShowWhenLoadedDelegate;
    };

    private static void HideCloseButton(Window w) {
        var hwnd = new WindowInteropHelper(w).Handle;
        SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);
    }

    private static void ShowCloseButton(Window w) {
        var hwnd = new WindowInteropHelper(w).Handle;
        SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) | WS_SYSMENU);
    }

    #endregion

    #region IsHiddenCloseButton (readonly attached property)

    private static readonly DependencyPropertyKey IsHiddenCloseButtonKey =
        DependencyProperty.RegisterAttachedReadOnly(
            "IsHiddenCloseButton",
            typeof (bool),
            OwnerType,
            new FrameworkPropertyMetadata(false));

    public static readonly DependencyProperty IsHiddenCloseButtonProperty =
        IsHiddenCloseButtonKey.DependencyProperty;

    [AttachedPropertyBrowsableForType(typeof(Window))]
    public static bool GetIsHiddenCloseButton(Window obj) {
        return (bool)obj.GetValue(IsHiddenCloseButtonProperty);
    }

    private static void SetIsHiddenCloseButton(Window obj, bool value) {
        obj.SetValue(IsHiddenCloseButtonKey, value);
    }

    #endregion

}

然后在XAML中，你只需要这样设置:

<Window 
    x:Class="WafClient.Presentation.Views.SampleWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:u="clr-namespace:WafClient.Presentation.Behaviors"
    ResizeMode="NoResize"
    u:WindowBehavior.HideCloseButton="True">
    ...
</Window>

正如在其他答案中所述，您可以使用WindowStyle="None"来完全删除标题栏。

并且，正如其他答案的评论中所述，这阻止了窗口的可拖动性，因此很难将其从初始位置移动。

但是，你可以通过在窗口的代码后面文件的构造函数中添加一行代码来克服这个问题:

MouseDown += delegate { DragMove(); };

或者，如果你喜欢Lambda语法:

MouseDown += (sender, args) => DragMove();

这使得整个窗口可拖动。窗口中出现的任何交互控件，如按钮，仍将正常工作，不会作为窗口的拖拽句柄。

让用户“关闭”窗口，但实际上只是隐藏它。

在窗口的OnClosing事件中，隐藏已经可见的窗口:

    If Me.Visibility = Windows.Visibility.Visible Then
        Me.Visibility = Windows.Visibility.Hidden
        e.Cancel = True
    End If

每次后台线程执行时，重新显示后台UI窗口:

    w.Visibility = Windows.Visibility.Visible
    w.Show()

当终止程序执行时，确保所有窗口都是/可以关闭的:

Private Sub CloseAll()
    If w IsNot Nothing Then
        w.Visibility = Windows.Visibility.Collapsed ' Tell OnClosing to really close
        w.Close()
    End If
End Sub

将WindowStyle属性设置为None，这将隐藏控制框和标题栏。不需要内核调用。