如何更改WPF中的屏幕分辨率？

Question

我如何在WPF中以編程方式更改屏幕分辨率？ 如何獲取可用分辨率列表以供顯示？

我試過了這篇文章中描述的示例：http://www.c-sharpcorner.com/UploadFile/Joshy_geo/changescreenresolution10102006112110AM/changescreenresolution.aspx但Screen and Resolution類在System.Diagnostics名稱空間中不存在。

C＃/ WPF

Thanx。

Answer 1

對不起。我找到了Windows Forms的解決方案並做了細微的更改。在窗口上

WPF解決方案

放置兩個列表框（listDevices和listSettings和按鈕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屏幕分辨率來源：http://www.mediafire.com/?ciiymhmc7v28v4y