选择监视器以显示 WPF 应用程序

Question

我正在开发 WPF 应用程序，我想选择显示窗口的监视器。我的.NET版本是8.0，SO是Windows，版本是7.0。

我正在尝试应用 Mostlytech 步骤，但它对我来说不起作用，窗口始终显示在同一监视器上，与所选的

AllScreens

参数无关。:

我的C#：

  public MainWindow () {

      this.WindowStartupLocation = WindowStartupLocation.Manual;
      Debug.Assert(System.Windows.Forms.SystemInformation.MonitorCount > 1);
      System.Drawing.Rectangle workingArea = System.Windows.Forms.Screen.AllScreens[0].WorkingArea;

      this.Left = workingArea.Left;
      this.Top = workingArea.Top;
      this.Width = workingArea.Width;
      this.Height = workingArea.Height;
      this.WindowState = WindowState.Maximized;
      this.WindowStyle = WindowStyle.None;
      this.Topmost = true;
      this.Show();

      InitializeComponent();
      SetLists();
      // Rest of the Program.

  }

我的 XAML 标头：

<Window x:Class="_4913_TV.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"
        xmlns:local="clr-namespace:_4913_TV"
        mc:Ignorable="d"
        WindowState="Maximized"
        WindowStyle="None"
        Title="MainWindow"
        Cursor="None"
        Width="4096"
        Height="2160"
        KeyDown="KeyedKey">

System.Drawing.Rectangle workingArea = System.Windows.Forms.Screen.AllScreens[0].WorkingArea;

它似乎正确包含来自我的显示器的信息。

非常感谢您的支持。

Answer 1

当显示器的 DPI 不是默认值 (100%) 时，您链接的代码片段不会使窗口正确最大化。

相反，我想建议一种不同的方法。下面的代码将操纵最大化窗口的位置和大小，以适应由命令行参数给出的索引号指定的监视器的工作区域。

using System;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

namespace WpfApp2;

public partial class MainWindow : Window
{
    public int Index { get; private set; }

    public MainWindow()
    {
        InitializeComponent();

        // Get index number from command-line argument.
        Index = int.TryParse(Environment.GetCommandLineArgs().LastOrDefault(), out int i) && (i > 0) ? i : 0;

        nint handle = new WindowInteropHelper(this).EnsureHandle();
        HwndSource source = HwndSource.FromHwnd(handle);
        source.AddHook(new HwndSourceHook(WndProc));
    }

    private const int WM_GETMINMAXINFO = 0x0024;

    [StructLayout(LayoutKind.Sequential)]
    private struct POINT
    {
        public int x;
        public int y;
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct MINMAXINFO
    {
        public POINT ptReserved;
        public POINT ptMaxSize;
        public POINT ptMaxPosition;
        public POINT ptMinTrackSize;
        public POINT ptMaxTrackSize;
    }

    private nint WndProc(nint hwnd, int msg, nint wParam, nint lParam, ref bool handled)
    {
        switch (msg)
        {
            case WM_GETMINMAXINFO:
                var screens = System.Windows.Forms.Screen.AllScreens;
                if (Index < screens.Length)
                {
                    var workingArea = screens[Index].WorkingArea;

                    var info = Marshal.PtrToStructure<MINMAXINFO>(lParam);

                    info.ptMaxPosition.x = workingArea.X;
                    info.ptMaxPosition.y = workingArea.Y;
                    info.ptMaxSize.x = workingArea.Width;
                    info.ptMaxSize.y = workingArea.Height;

                    Marshal.StructureToPtr(info, lParam, true);
                }
                break;
        }
        return nint.Zero;
    }
}

<Window x:Class="WpfApp2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow"
        Width="400" Height="300"
        WindowStartupLocation="Manual"
        WindowState="Maximized"
        Topmost="True">
    <Grid>

    </Grid>
</Window>

它要求应用程序清单中包含以下部分。

<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
  <application>
    <!-- Windows 10 -->
    <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
  </application>
</compatibility>

<application xmlns="urn:schemas-microsoft-com:asm.v3">
  <windowsSettings>
    <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor</dpiAwareness>
  </windowsSettings>
</application>