我正在开发 WPF 应用程序，我遇到了以下问题：WindowStyle=Noneand WindowState = WindowState.Maximized该应用程序位于顶部或左侧任务栏下方。
当任务栏放置在底部或右侧时，一切正常。
我知道关于Left and Topwindow 的属性，但它们在Maximized state.
还有Microsoft.Windows.Shell.WindowСhrome它提供了拖动、双击最大化和恢复、捕捉和取消捕捉的能力。 （需要添加为dll引用）
我希望实现我的应用程序不会隐藏或位于任务栏下，并且可以正常工作WindowСhrome提供。
主窗口.xaml
<Window x:Class="WpfAppTestFullScreen.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
WindowStyle="None"
Title="MainWindow" Height="350" Width="525"
Left="100" Top="100">
<WindowChrome.WindowChrome>
<WindowChrome CaptionHeight="{Binding ActualHeight,ElementName=topBarGrid}"/>
</WindowChrome.WindowChrome>
<Grid x:Name="mainGrid" Background="Yellow">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid x:Name="topBarGrid" Grid.Row="0" >
<Border BorderBrush="Black" BorderThickness="1" >
<DockPanel x:Name="panelForWindowControls"
VerticalAlignment="Stretch"
DockPanel.Dock="Right"
LastChildFill="False"
>
<Button Name="buttonExit"
Width="43" Height="28"
Margin="0" Click="buttonExit_Click"
DockPanel.Dock="Right" Content="x"
WindowChrome.IsHitTestVisibleInChrome="True"
/>
<Button Name="buttonMax"
Width="43" Height="28"
Margin="0" Click="buttonMax_Click"
DockPanel.Dock="Right" Content="[]"
WindowChrome.IsHitTestVisibleInChrome="True"
/>
<Button Name="buttonMin"
Width="43" Height="28"
Margin="0" Click="buttonMin_Click"
DockPanel.Dock="Right" Content="_"
WindowChrome.IsHitTestVisibleInChrome="True"
/>
</DockPanel>
</Border>
</Grid>
<Grid x:Name="bodyGrid" Grid.Row="1">
<Button Content="FullScreen" x:Name="FullScreenButton"
Height="50" Width="200"
HorizontalAlignment="Center" VerticalAlignment="Center"
Click="FullScreenButton_Click" />
</Grid>
</Grid>
</Window>
MainWindow.xaml.cs
using System.Windows;
namespace WpfAppTestFullScreen
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
MaxHeight = SystemParameters.MaximizedPrimaryScreenHeight;
MaxWidth = SystemParameters.MaximizedPrimaryScreenWidth;
}
private void FullScreenButton_Click(object sender, RoutedEventArgs e)
{
if (WindowState == WindowState.Maximized)
{
WindowState = WindowState.Normal;
}
else
{
WindowState = WindowState.Maximized;
}
}
private void buttonMax_Click(object sender, RoutedEventArgs e)
{
if (WindowState == WindowState.Maximized)
{
WindowState = WindowState.Normal;
}
else
{
WindowState = WindowState.Maximized;
}
}
private void buttonMin_Click(object sender, RoutedEventArgs e)
{
WindowState = (WindowState == WindowState.Minimized) ? WindowState.Normal : WindowState.Minimized;
}
private void buttonExit_Click(object sender, RoutedEventArgs e)
{
}
}
}
Here is screenshot of problem:
![Part of App is under left placed taskbar]](https://i.stack.imgur.com/1Uysk.png)
更好的方法是使用来自User32.dll
（取自这篇博文 https://blogs.msdn.microsoft.com/llobo/2006/08/01/maximizing-window-with-windowstylenone-considering-taskbar/)
怎么运行的：
每个窗口都有一个关联的窗口过程——一个处理发送或发布到该类所有窗口的所有消息的函数。窗口的外观和行为的所有方面都取决于窗口过程对这些消息的响应。
0x24 = WM_GETMINMAXINFO https://msdn.microsoft.com/en-us/library/windows/desktop/ms632626(v=vs.85).aspx) that the window size is about to be changed
当窗口的大小或位置即将改变时发送到窗口。应用程序可以使用此消息来覆盖窗口的默认最大化大小和位置，或其默认的最小或最大跟踪大小。
应用程序可以通过设置此结构的成员来覆盖默认值。
因此，无论窗口如何调整大小（拖动到屏幕顶部、Windows 键 + 箭头、最大化按钮等），它都将保留在工作区域的边界内。
Native Methods and Types:
(just copy this class into your project)
public static class Native
{
[DllImport("user32")]
internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
[DllImport("user32")]
internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);
public static void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam, int minWidth, int minHeight)
{
MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
// Adjust the maximized size and position to fit the work area of the correct monitor
int MONITOR_DEFAULTTONEAREST = 0x00000002;
IntPtr monitor = Native.MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
if (monitor != IntPtr.Zero)
{
Native.MONITORINFO monitorInfo = new Native.MONITORINFO();
Native.GetMonitorInfo(monitor, monitorInfo);
Native.RECT rcWorkArea = monitorInfo.rcWork;
Native.RECT rcMonitorArea = monitorInfo.rcMonitor;
mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left);
mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top);
mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top);
mmi.ptMinTrackSize.x = minWidth;
mmi.ptMinTrackSize.y = minHeight;
}
Marshal.StructureToPtr(mmi, lParam, true);
}
/// <summary>
/// POINT aka POINTAPI
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
/// <summary>
/// x coordinate of point.
/// </summary>
public int x;
/// <summary>
/// y coordinate of point.
/// </summary>
public int y;
/// <summary>
/// Construct a point of coordinates (x,y).
/// </summary>
public POINT(int x, int y)
{
this.x = x;
this.y = y;
}
}
[StructLayout(LayoutKind.Sequential)]
public struct MINMAXINFO
{
public POINT ptReserved;
public POINT ptMaxSize;
public POINT ptMaxPosition;
public POINT ptMinTrackSize;
public POINT ptMaxTrackSize;
};
/// <summary>
/// </summary>
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class MONITORINFO
{
/// <summary>
/// </summary>
public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));
/// <summary>
/// </summary>
public RECT rcMonitor = new RECT();
/// <summary>
/// </summary>
public RECT rcWork = new RECT();
/// <summary>
/// </summary>
public int dwFlags = 0;
}
/// <summary> Win32 </summary>
[StructLayout(LayoutKind.Sequential, Pack = 0)]
public struct RECT
{
/// <summary> Win32 </summary>
public int left;
/// <summary> Win32 </summary>
public int top;
/// <summary> Win32 </summary>
public int right;
/// <summary> Win32 </summary>
public int bottom;
/// <summary> Win32 </summary>
public static readonly RECT Empty = new RECT();
/// <summary> Win32 </summary>
public int Width
{
get { return Math.Abs(right - left); } // Abs needed for BIDI OS
}
/// <summary> Win32 </summary>
public int Height
{
get { return bottom - top; }
}
/// <summary> Win32 </summary>
public RECT(int left, int top, int right, int bottom)
{
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
/// <summary> Win32 </summary>
public RECT(RECT rcSrc)
{
this.left = rcSrc.left;
this.top = rcSrc.top;
this.right = rcSrc.right;
this.bottom = rcSrc.bottom;
}
/// <summary> Win32 </summary>
public bool IsEmpty
{
get
{
// BUGBUG : On Bidi OS (hebrew arabic) left > right
return left >= right || top >= bottom;
}
}
/// <summary> Return a user friendly representation of this struct </summary>
public override string ToString()
{
if (this == RECT.Empty) { return "RECT {Empty}"; }
return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
}
/// <summary> Determine if 2 RECT are equal (deep compare) </summary>
public override bool Equals(object obj)
{
if (!(obj is Rect)) { return false; }
return (this == (RECT)obj);
}
/// <summary>Return the HashCode for this struct (not garanteed to be unique)</summary>
public override int GetHashCode()
{
return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
}
/// <summary> Determine if 2 RECT are equal (deep compare)</summary>
public static bool operator ==(RECT rect1, RECT rect2)
{
return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom);
}
/// <summary> Determine if 2 RECT are different(deep compare)</summary>
public static bool operator !=(RECT rect1, RECT rect2)
{
return !(rect1 == rect2);
}
}
}
您的窗口：
public partial class MainWindow : Window
{
public MainWindow()
{
SourceInitialized += Window_SourceInitialized;
InitializeComponent();
}
void Window_SourceInitialized(object sender, EventArgs e)
{
IntPtr handle = new WindowInteropHelper(this).Handle;
HwndSource.FromHwnd(handle)?.AddHook(WindowProc);
}
private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case 0x0024:
Native.WmGetMinMaxInfo(hwnd, lParam, (int)MinWidth, (int)MinHeight);
handled = true;
break;
}
return (IntPtr)0;
}
private void FullScreenButton_Click(object sender, RoutedEventArgs e)
{
WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
}
private void buttonMax_Click(object sender, RoutedEventArgs e)
{
WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
}
private void buttonMin_Click(object sender, RoutedEventArgs e)
{
WindowState = WindowState == WindowState.Minimized ? WindowState.Normal : WindowState.Minimized;
}
private void buttonExit_Click(object sender, RoutedEventArgs e)
{
Close();
}
}