[.NET源码学习]实例化Font，遭遇字体不存在的情况。

1 private void Initialize(string familyName, float emSize, FontStyle style, GraphicsUnit unit, byte gdiCharSet, bool gdiVerticalFont)
2 {
3     this.originalFontName = familyName;
4     this.SetFontFamily(new FontFamily(Font.StripVerticalName(familyName), true));
5     this.Initialize(this.fontFamily, emSize, style, unit, gdiCharSet, gdiVerticalFont);
6 }

1 internal FontFamily(string name, bool createDefaultOnFail)
2 {
3     this.createDefaultOnFail = createDefaultOnFail;
4     this.CreateFontFamily(name, null);
5 }

 1 private void CreateFontFamily(string name, FontCollection fontCollection)
 2 {
 3     IntPtr intPtr = IntPtr.Zero;
 4     IntPtr handle = (fontCollection == null) ? IntPtr.Zero : fontCollection.nativeFontCollection;
 5     int num = SafeNativeMethods.Gdip.GdipCreateFontFamilyFromName(name, new HandleRef(fontCollection, handle), out intPtr);
 6     if (num != 0)
 7     {
 8         if (this.createDefaultOnFail)
 9         {
10             intPtr = FontFamily.GetGdipGenericSansSerif();
11         }
12         else
13         {
14             if (num == 14)
15             {
16                 throw new ArgumentException(SR.GetString("GdiplusFontFamilyNotFound", new object[]
17                 {
18                     name
19                 }));
20             }
21             if (num == 16)
22             {
23                 throw new ArgumentException(SR.GetString("GdiplusNotTrueTypeFont", new object[]
24                 {
25                     name
26                 }));
27             }
28             throw SafeNativeMethods.Gdip.StatusException(num);
29         }
30     }
31     this.SetNativeFamily(intPtr);
32 }    

 1 private static IntPtr GetGdipGenericSansSerif()
 2 {
 3     IntPtr zero = IntPtr.Zero;
 4     int num = SafeNativeMethods.Gdip.GdipGetGenericFontFamilySansSerif(out zero);
 5     if (num != 0)
 6     {
 7         throw SafeNativeMethods.Gdip.StatusException(num);
 8     }
 9     return zero;
10 }