c# - 为什么 System.Drawing.Fontconverter.ConvertFromInvariantString ("NOTAFONT")返回 SansSerif？

Question

为什么

var fontConverter = new FontConverter();            
var retFont = fontConverter.ConvertFromInvariantString("NOTAFONT");

return {Name = "Microsoft Sans Serif" Size=8.25}

并且不抛出异常？

使用此代码，我打算测试一个字符串是否包含有效的字体序列化。还有其他方法可以检查吗？

我检查了 FontConverter 类的代码，它创建了如下所示的 returnfont:

 var retFont = new Font("notafont", 1.2f, FontStyle.Bold);

返回的字体为{Name = "Microsoft Sans Serif"Size=1.2}

Answer 1

查看 MSDN Documentation on the Font Class备注部分有一个有趣的说法。

即:

For more information about how to construct fonts, see How to: Construct Font Families and Fonts. Windows Forms applications support TrueType fonts and have limited support for OpenType fonts. If you attempt to use a font that is not supported, or the font is not installed on the machine that is running the application, the Microsoft Sans Serif font will be substituted.

我认为您正在看到这种行为。

不确定这是否能满足您的需求，但在本例中我使用 InstalledFontCollection验证字体是否可用。

bool CheckFontAvailability(string value)
{
    FontCollection fc = new InstalledFontCollection();
    return fc.Families.Any(ff => ff.Name.Contains(value));
}

---

或由 schoetbi 修改

 bool CheckFontAvailability(string fontAsString)
{
    FontCollection fc = new InstalledFontCollection(); 
    return fc.Families.Any(ff => fontAsString.StartsWith(ff.Name));
}