avalonia项目在银河麒麟操作系统arm架构上运行报错：default font family is not be null or empty

唐朝豪放男 發表於 2021-1-29 20:33:00

avalonia项目在银河麒麟操作系统arm架构上运行报错：default font family is not be null or empty

最近在做c#跨平台项目的时候，遇到了avalonia项目在银河麒麟操作系统上运行时报错：default font family is not be null or empty。但是在windows、ubuntu上运行没有问题。最终通过查看avalonia源码和官方提供的测试示例找到解决方案。(记录一下，避免以后忘了。。。)
第一步：将字体最为项目的嵌入资源导入进项目。
<img src="https://img2020.cnblogs.com/blog/1346153/202101/1346153-20210129202641300-1336503896.png">
<div class="cnblogs_code">
<pre><ItemGroup>
<EmbeddedResource Include="Assets\Fonts\msyh.ttc" />
<EmbeddedResource Include="Assets\Fonts\msyhbd.ttc" />
<EmbeddedResource Include="Assets\Fonts\msyhl.ttc" />
</ItemGroup></pre>
</div>
第二步：新建一个类，作为自定义字体管理类。
<div class="cnblogs_code">
<pre>public class CustomFontManagerImpl : IFontManagerImpl
{
 private readonly Typeface[] _customTypefaces;
 private readonly string _defaultFamilyName;

 //Load font resources in the project, you can load multiple font resources
 private readonly Typeface _defaultTypeface =
 new Typeface("resm:AvaloniaApplication1.Assets.Fonts.msyh#微软雅黑");

 public CustomFontManagerImpl()
 {
 _customTypefaces = new[] { _defaultTypeface };
 _defaultFamilyName = _defaultTypeface.FontFamily.FamilyNames.PrimaryFamilyName;
 }

 public string GetDefaultFontFamilyName()
 {
 return _defaultFamilyName;
 }

 public IEnumerable<string> GetInstalledFontFamilyNames(bool checkForUpdates = false)
 {
 return _customTypefaces.Select(x => x.FontFamily.Name);
 }

 private readonly string[] _bcp47 = { CultureInfo.CurrentCulture.ThreeLetterISOLanguageName, CultureInfo.CurrentCulture.TwoLetterISOLanguageName };

 public bool TryMatchCharacter(int codepoint, FontStyle fontStyle, FontWeight fontWeight, FontFamily fontFamily,
 CultureInfo culture, out Typeface typeface)
 {
 foreach (var customTypeface in _customTypefaces)
 {
 if (customTypeface.GlyphTypeface.GetGlyph((uint)codepoint) == 0)
 {
 continue;
 }

 typeface = new Typeface(customTypeface.FontFamily.Name, fontStyle, fontWeight);

 return true;
 }

 var fallback = SKFontManager.Default.MatchCharacter(fontFamily?.Name, (SKFontStyleWeight)fontWeight,
 SKFontStyleWidth.Normal, (SKFontStyleSlant)fontStyle, _bcp47, codepoint);

 typeface = new Typeface(fallback?.FamilyName ?? _defaultFamilyName, fontStyle, fontWeight);

 return true;
 }

 public IGlyphTypefaceImpl CreateGlyphTypeface(Typeface typeface)
 {
 SKTypeface skTypeface;

 switch (typeface.FontFamily.Name)
 {
 case FontFamily.DefaultFontFamilyName:
 case "微软雅黑"://font family name
 skTypeface = SKTypeface.FromFamilyName(_defaultTypeface.FontFamily.Name); break;
 default:
 skTypeface = SKTypeface.FromFamilyName(typeface.FontFamily.Name,
 (SKFontStyleWeight)typeface.Weight, SKFontStyleWidth.Normal, (SKFontStyleSlant)typeface.Style);
 break;
 }

 return new GlyphTypefaceImpl(skTypeface);
 }
}</pre>
</div>
第三步：在App.axaml.cs中重写RegisterServices()函数，将我们自定义的字体管理对象注册进去。
<div class="cnblogs_code">
<pre>/// <summary>
 /// override RegisterServices register custom service
 /// </summary>
 public override void RegisterServices()
 {
 AvaloniaLocator.CurrentMutable.Bind<IFontManagerImpl>().ToConstant(new CustomFontManagerImpl());
 base.RegisterServices();
 }</pre>
</div>
 
经过以上三个步骤，我的程序可以在windows、Ubuntu、银河麒麟操作系统上正常运行，没有出错。 
来源：https://www.cnblogs.com/joyandjoys/p/14346935.html

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avalonia项目在银河麒麟操作系统arm架构上运行报错：default font family is not be null or empty