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所属分类：linux技术
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。
<ItemGroup> <EmbeddedResource Include="AssetsFontsmsyh.ttc" /> <EmbeddedResource Include="AssetsFontsmsyhbd.ttc" /> <EmbeddedResource Include="AssetsFontsmsyhl.ttc" /> </ItemGroup>
第二步：新建一个类，作为自定义字体管理类。
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); } }
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。
/// <summary> /// override RegisterServices register custom service /// </summary> public override void RegisterServices() { AvaloniaLocator.CurrentMutable.Bind<IFontManagerImpl>().ToConstant(new CustomFontManagerImpl()); base.RegisterServices(); }
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。
