强制DPI在WPF中进行测试

 <system.windows>
    <dpiAwareness xmlns="http://schemas.microsoft.com/winfx/2006/xaml">
      PerMonitorV2
    </dpiAwareness>
  </system.windows>
</configuration>

using System.Windows;
using System.Windows.Media;

namespace MyWPFApp
{
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            // 设置DPI
            SetDpi();
        }

        private void SetDpi()
        {
            // 设置DPI为96
            SetDpi(96);
        }

        private void SetDpi(double dpi)
        {
            // 获取当前窗口
            Window window = Application.Current.MainWindow;

            // 获取窗口的源
            PresentationSource source = PresentationSource.FromVisual(window);

            // 获取窗口的DPI
            double oldDpi = source.CompositionTarget.TransformToDevice.M11;

            // 设置新的DPI
            double newDpi = dpi / 96.0;
            double scaleFactor = newDpi / oldDpi;
            window.LayoutTransform = new ScaleTransform(scaleFactor, scaleFactor);
        }
    }
}