即使在 Windows 重新启动后，C# AddFontResource 也不起作用

我正在尝试使用以下代码使用 C# 代码安装字体.

I'm trying to install a font using C# code using the code below.

调用 InstallFont 不会抛出任何异常并返回 1.我认为这表明它已安装字体.但是，无论是在 Windows Fonts 文件夹中还是在检查 InstalledFontCollection 时，该字体都不会出现在已安装字体列表中，也不会出现在我的软件中.安装后我尝试重新启动计算机，但它仍然不可用.

Calling InstallFont doesn't throw any exceptions and returns 1. I thought this indicated it's installed the font. However the font does not appear in the list of installed fonts either in the Windows Fonts folder or when checking InstalledFontCollection, neither is it displayed in my software. I have tried restarting the computer after install but it is still not available.

如果我通过双击 Windows 资源管理器并单击安装来手动安装文件，则字体安装不会出现问题.

If I install the file manually by double clicking in Windows Explorer and clicking Install the font installs without issue.

我在 Windows 7 64 位操作系统上使用 C#、Visual Studio 2010、Microsoft .NET Framework 4.0.

I am using C#, Visual Studio 2010, Microsoft .NET Framework 4.0 on a Windows 7 64bit operating system.

任何帮助将不胜感激.

非常感谢，保罗

清单文件包括:

requestedExecutionLevel level="requireAdministrator" uiAccess="false"

应用代码:

[DllImport("user32.dll")]
public static extern int SendMessage(int hWnd, uint Msg, int wParam, int lParam);
[DllImport("gdi32.dll", EntryPoint = "AddFontResourceW", SetLastError = true)]
public static extern int AddFontResource([In][MarshalAs(UnmanagedType.LPWStr)] string lpFileName);

public static int InstallFont()        
{
    InstalledFontCollection ifc = new InstalledFontCollection();

    if (ifc.Families.Any(item => item.Name == "Arial Narrow"))
        return 100; // Font already installed

    string filename = @"C:\Users\username\Downloads\ARIALN.TTF";

    const int WM_FONTCHANGE = 0x001D;
    const int HWND_BROADCAST = 0xffff;

    int added = AddFontResource(filename);
    SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);

    return added;
}