ApiExamples.ExRendering.RecieveFontSubstitutionNotification C# (CSharp) Метод

        public void RecieveFontSubstitutionNotification()
        {
            // Store the font sources currently used so we can restore them later. 
            FontSourceBase[] origFontSources = FontSettings.DefaultInstance.GetFontsSources();

            //ExStart
            //ExFor:IWarningCallback
            //ExFor:SaveOptions.WarningCallback
            //ExId:FontSubstitutionNotification
            //ExSummary:Demonstrates how to recieve notifications of font substitutions by using IWarningCallback.
            // Load the document to render.
            Document doc = new Document(MyDir + "Document.doc");

            // Create a new class implementing IWarningCallback and assign it to the PdfSaveOptions class.
            HandleDocumentWarnings callback = new HandleDocumentWarnings();
            doc.WarningCallback = callback;

            // We can choose the default font to use in the case of any missing fonts.
            FontSettings.DefaultInstance.DefaultFontName = "Arial";

            // For testing we will set Aspose.Words to look for fonts only in a folder which doesn't exist. Since Aspose.Words won't
            // find any fonts in the specified directory, then during rendering the fonts in the document will be subsuited with the default 
            // font specified under FontSettings.DefaultFontName. We can pick up on this subsuition using our callback.
            FontSettings.DefaultInstance.SetFontsFolder(string.Empty, false);

            // Pass the save options along with the save path to the save method.
            doc.Save(MyDir + @"\Artifacts\Rendering.MissingFontNotification.pdf");
            //ExEnd
            
            Assert.Greater(callback.mFontWarnings.Count, 0);
            Assert.True(callback.mFontWarnings[0].WarningType == WarningType.FontSubstitution);
            Assert.True(callback.mFontWarnings[0].Description.Contains("has not been found"));

            // Restore default fonts. 
            FontSettings.DefaultInstance.SetFontsSources(origFontSources);
        }