如何在WPF中更改屏幕分辨率？

Question

如何在WPF中以编程方式更改屏幕分辨率？ 如何获取可用分辨率列表以供显示？

我尝试了一下本文中描述的示例： http ： //www.c-sharpcorner.com/UploadFile/Joshy_geo/changescreenresolution10102006112110AM/changescreenresolution.aspx但是System.Diagnostics命名空间中不存在Screen和Resolution类。

C＃/ WPF

感谢名单。

Answer 1

抱歉，添麻烦了。 我找到了Windows Forms的解决方案并做了一些小改动。

WPF解决方案

在窗口上放置两个Listbox（listDevices和listSettings）和Button（btnSave）。

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Controls;

 public partial class MainWindow : Window { [StructLayout(LayoutKind.Sequential)] public struct DISPLAY_DEVICE { public int cb; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] public string DeviceName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)] public string DeviceString; public int StateFlags; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)] public string DeviceID; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)] public string DeviceKey; public DISPLAY_DEVICE(int flags) { cb = 0; StateFlags = flags; DeviceName = new string((char)32, 32); DeviceString = new string((char)32, 128); DeviceID = new string((char)32, 128); DeviceKey = new string((char)32, 128); cb = Marshal.SizeOf(this); } } [StructLayout(LayoutKind.Sequential)] 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 short dmOrientation; public short dmPaperSize; public short dmPaperLength; public short dmPaperWidth; public short dmScale; public short dmCopies; public short dmDefaultSource; public short dmPrintQuality; 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 dmUnusedPadding; public short dmBitsPerPel; public int dmPelsWidth; public int dmPelsHeight; public int dmDisplayFlags; public int dmDisplayFrequency; } public MainWindow() { InitializeComponent(); EnumDevices(); } private void listDevices_SelectionChanged(object sender, SelectionChangedEventArgs e) { int devNum = listDevices.SelectedIndex; bool isMain = MainDevice(devNum); btnSet.IsEnabled = isMain; // enable only for the main device EnumModes(devNum); } private void btnSet_Click(object sender, RoutedEventArgs e) { //set selected display mode int devNum = listDevices.SelectedIndex; int modeNum = listSettings.SelectedIndex; DEVMODE d = GetDevmode(devNum, modeNum); if (d.dmBitsPerPel != 0 & d.dmPelsWidth != 0 & d.dmPelsHeight != 0) { ChangeDisplaySettings(ref d, 0); } } private void EnumModes(int devNum) { listSettings.Items.Clear(); string devName = GetDeviceName(devNum); DEVMODE devMode = new DEVMODE(); int modeNum = 0; bool result = true; do { result = EnumDisplaySettings(devName, modeNum, ref devMode); if (result) { string item = DevmodeToString(devMode); listSettings.Items.Add(item); } modeNum++; } while (result); if (listSettings.Items.Count > 0) { DEVMODE current = GetDevmode(devNum, -1); // int selected = listSettings.FindString(DevmodeToString(current)); int selected = listSettings.Items.IndexOf(DevmodeToString(current)); if (selected >= 0) { listSettings.SelectedIndex = selected; // listSettings.SetSelected(selected, true); } } } private DEVMODE GetDevmode(int devNum, int modeNum) { //populates DEVMODE for the specified device and mode DEVMODE devMode = new DEVMODE(); string devName = GetDeviceName(devNum); EnumDisplaySettings(devName, modeNum, ref devMode); return devMode; } private string DevmodeToString(DEVMODE devMode) { return devMode.dmPelsWidth.ToString() + " x " + devMode.dmPelsHeight.ToString() + ", " + devMode.dmBitsPerPel.ToString() + " bits, " + devMode.dmDisplayFrequency.ToString() + " Hz"; } private void EnumDevices() { //populates Display Devices list this.listDevices.Items.Clear(); DISPLAY_DEVICE d = new DISPLAY_DEVICE(0); int devNum = 0; bool result; do { result = EnumDisplayDevices(IntPtr.Zero, devNum, ref d, 0); if (result) { string item = devNum.ToString() + ". " + d.DeviceString.Trim(); if ((d.StateFlags & 4) != 0) item += " - main"; this.listDevices.Items.Add(item); } devNum++; } while (result); } private string GetDeviceName(int devNum) { DISPLAY_DEVICE d = new DISPLAY_DEVICE(0); bool result = EnumDisplayDevices(IntPtr.Zero, devNum, ref d, 0); return (result ? d.DeviceName.Trim() : "#error#"); } private bool MainDevice(int devNum) { //whether the specified device is the main device DISPLAY_DEVICE d = new DISPLAY_DEVICE(0); if (EnumDisplayDevices(IntPtr.Zero, devNum, ref d, 0)) { return ((d.StateFlags & 4) != 0); } return false; } [DllImport("User32.dll")] private static extern bool EnumDisplayDevices( IntPtr lpDevice, int iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, int dwFlags); [DllImport("User32.dll")] private static extern bool EnumDisplaySettings( string devName, int modeNum, ref DEVMODE devMode); [DllImport("user32.dll")] public static extern int ChangeDisplaySettings( ref DEVMODE devMode, int flags); } 

WPF屏幕分辨率来源： http ： //www.mediafire.com/？ciiymhmc7v28v4y