C# wpf之控制屏幕显示方向旋转

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using MessageBox = HandyControl.Controls.MessageBox;
namespace HC控件
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
// initialize the DEVMODE structure
DEVMODE dm = new DEVMODE();
dm.dmDeviceName = new string(new char[32]);
dm.dmFormName = new string(new char[32]);
dm.dmSize = (short)Marshal.SizeOf(dm);

if (0 != NativeMethods.EnumDisplaySettings(
null,
NativeMethods.ENUM_CURRENT_SETTINGS,
ref dm))
{
// swap width and height
int temp = dm.dmPelsHeight;
dm.dmPelsHeight = dm.dmPelsWidth;
dm.dmPelsWidth = temp;

// determine new orientation
switch (dm.dmDisplayOrientation)
{
case NativeMethods.DMDO_DEFAULT:
dm.dmDisplayOrientation = NativeMethods.DMDO_270;
break;
case NativeMethods.DMDO_270:
dm.dmDisplayOrientation = NativeMethods.DMDO_180;
break;
case NativeMethods.DMDO_180:
dm.dmDisplayOrientation = NativeMethods.DMDO_90;
break;
case NativeMethods.DMDO_90:
dm.dmDisplayOrientation = NativeMethods.DMDO_DEFAULT;
break;
default:
// unknown orientation value
// add exception handling here
break;
}
int iRet = NativeMethods.ChangeDisplaySettings(ref dm, 0);
}
}
private void Button_Click(object sender, RoutedEventArgs e)
{
IntPtr hwnd = new WindowInteropHelper(this).Handle;
}
}
public class NativeMethods
{
public static DEVMODE CreateDevmode()
{
DEVMODE dm = new DEVMODE();
dm.dmDeviceName = new String(new char[32]);
dm.dmFormName = new String(new char[32]);
dm.dmSize = (short)Marshal.SizeOf(dm);
return dm;
}

// PInvoke declaration for EnumDisplaySettings Win32 API
[DllImport("user32.dll", CharSet = CharSet.Ansi)]
public static extern int EnumDisplaySettings(
string lpszDeviceName,
int iModeNum,
ref DEVMODE lpDevMode);

// PInvoke declaration for ChangeDisplaySettings Win32 API
[DllImport("user32.dll")]
public static extern int ChangeDisplaySettings(
ref DEVMODE lpDevMode,
int dwFlags);

// add more functions as needed …

// constants
public const int ENUM_CURRENT_SETTINGS = -1;
public const int DMDO_DEFAULT = 0;
public const int DMDO_90 = 1;
public const int DMDO_180 = 2;
public const int DMDO_270 = 3;
// add more constants as needed …
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct DEVMODE
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string dmDeviceName;

public short dmSpecVersion;
public short dmDriverVersion;
public short dmSize;
public short dmDriverExtra;
public int dmFields;
public int dmPositionX;
public int dmPositionY;
public int dmDisplayOrientation;
public int dmDisplayFixedOutput;
public short dmColor;
public short dmDuplex;
public short dmYResolution;
public short dmTTOption;
public short dmCollate;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string dmFormName;

public short dmLogPixels;
public short dmBitsPerPel;
public int dmPelsWidth;
public int dmPelsHeight;
public int dmDisplayFlags;
public int dmDisplayFrequency;
public int dmICMMethod;
public int dmICMIntent;
public int dmMediaType;
public int dmDitherType;
public int dmReserved1;
public int dmReserved2;
public int dmPanningWidth;
public int dmPanningHeight;
};
}

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原文链接：https://blog.csdn.net/Mr_WTX/article/details/120216851