SystemFontSource

SystemFontSource class

Represents all TrueType fonts installed to the system.

To learn more, visit the Working with Fonts documentation article.

public class SystemFontSource : FontSourceBase

Constructors

NameDescription
SystemFontSource()Ctor.
SystemFontSource(int)Ctor.

Properties

NameDescription
Priority { get; }Returns the font source priority.
override Type { get; }Returns the type of the font source.
WarningCallback { get; set; }Called during processing of font source when an issue is detected that might result in formatting fidelity loss.

Methods

NameDescription
GetAvailableFonts()Returns list of fonts available via this source.
static GetSystemFontFolders()Returns system font folders or empty array if folders are not accessible.

Examples

Shows how to access a document’s system font source and set font substitutes.

Document doc = new Document();
doc.FontSettings = new FontSettings();

// By default, a blank document always contains a system font source.
Assert.AreEqual(1, doc.FontSettings.GetFontsSources().Length);

SystemFontSource systemFontSource = (SystemFontSource) doc.FontSettings.GetFontsSources()[0];
Assert.AreEqual(FontSourceType.SystemFonts, systemFontSource.Type);
Assert.AreEqual(0, systemFontSource.Priority);

PlatformID pid = Environment.OSVersion.Platform;
bool isWindows = (pid == PlatformID.Win32NT) || (pid == PlatformID.Win32S) ||
                 (pid == PlatformID.Win32Windows) || (pid == PlatformID.WinCE);
if (isWindows)
{
    const string fontsPath = @"C:\WINDOWS\Fonts";
    Assert.AreEqual(fontsPath.ToLower(),
        SystemFontSource.GetSystemFontFolders().FirstOrDefault()?.ToLower());
}

foreach (string systemFontFolder in SystemFontSource.GetSystemFontFolders())
{
    Console.WriteLine(systemFontFolder);
}

// Set a font that exists in the Windows Fonts directory as a substitute for one that does not.
doc.FontSettings.SubstitutionSettings.FontInfoSubstitution.Enabled = true;
doc.FontSettings.SubstitutionSettings.TableSubstitution.AddSubstitutes("Kreon-Regular", new[] {"Calibri"});

Assert.AreEqual(1,
    doc.FontSettings.SubstitutionSettings.TableSubstitution.GetSubstitutes("Kreon-Regular").Count());
Assert.Contains("Calibri",
    doc.FontSettings.SubstitutionSettings.TableSubstitution.GetSubstitutes("Kreon-Regular").ToArray());

// Alternatively, we could add a folder font source in which the corresponding folder contains the font.
FolderFontSource folderFontSource = new FolderFontSource(FontsDir, false);
doc.FontSettings.SetFontsSources(new FontSourceBase[] {systemFontSource, folderFontSource});
Assert.AreEqual(2, doc.FontSettings.GetFontsSources().Length);

// Resetting the font sources still leaves us with the system font source as well as our substitutes.
doc.FontSettings.ResetFontSources();

Assert.AreEqual(1, doc.FontSettings.GetFontsSources().Length);
Assert.AreEqual(FontSourceType.SystemFonts, doc.FontSettings.GetFontsSources()[0].Type);
Assert.AreEqual(1,
    doc.FontSettings.SubstitutionSettings.TableSubstitution.GetSubstitutes("Kreon-Regular").Count());

See Also

StreamFontSource Class TableSubstitutionRule Class