c# - 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？以及如何获取可用的显示分辨率列表？

我试过本文中描述的示例:http://www.c-sharpcorner.com/UploadFile/Joshy_geo/changescreenresolution10102006112110AM/changescreenresolution.aspx但是 Screen 和 Resolution 类不存在于 System.Diagnostics 命名空间中。

C#/WPF

谢谢。

Answer 1

抱歉给您带来麻烦。我找到了适用于 Windows 窗体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;<br/>
using System.Runtime.InteropServices;<br/>
using System.Windows;<br/>
using System.Windows.Controls;



<pre><code>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);
}
</code></pre>



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