Task(1050427)-Add UG documentation for custom font registry feature in XlsIO

Excel to PDF/Custom Font/.NET/Custom Font/Custom Font.slnx

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+<Solution>
+  <Project Path="Custom Font/Custom Font.csproj" />
+</Solution>

Excel to PDF/Custom Font/.NET/Custom Font/Custom Font/Custom Font.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <RootNamespace>Custom_Font</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+		<PackageReference Include="Syncfusion.XlsIORenderer.NET" Version="*" />
+  </ItemGroup>
+
+  <ItemGroup>
+	<None Update="Data\*">
+		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+	</None>
+	<None Update="Output\*">
+		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+	</None>
+	<None Update="Data\MyFonts\*">
+		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+	</None>
+  </ItemGroup>
+
+</Project>

Excel to PDF/Custom Font/.NET/Custom Font/Custom Font/Program.cs

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+using Syncfusion.XlsIO;
+using Syncfusion.Drawing.Fonts;
+using Syncfusion.XlsIORenderer;
+using Syncfusion.Pdf;
+
+namespace Custom_Font
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            // Create a collection to store the custom font streams
+            List<Stream> fontStreams = new List<Stream>();
+
+            // Retrieve all font files from the specified directory
+            foreach (string file in Directory.GetFiles(Path.GetFullPath(@"Data/MyFonts")))
+            {
+                string extension = Path.GetExtension(file);
+
+                // Load only TrueType and OpenType font files
+                if (extension.Equals(".ttf", StringComparison.OrdinalIgnoreCase) ||
+                    extension.Equals(".otf", StringComparison.OrdinalIgnoreCase))
+                {
+                    // Read the font file and copy its content to a memory stream
+                    FileStream fileStream = new FileStream(file, FileMode.OpenOrCreate, FileAccess.Read);
+                    Stream stream = new MemoryStream();
+                    fileStream.CopyTo(stream);
+                    stream.Position = 0;
+                    fontStreams.Add(stream);
+                }
+            }
+
+            // Register the custom fonts for use during Excel-to-PDF conversion
+            FontManager.RegisterFonts(fontStreams);
+
+            using (ExcelEngine excelEngine = new ExcelEngine())
+            {
+                IApplication application = excelEngine.Excel;
+                application.DefaultVersion = ExcelVersion.Xlsx;
+
+                IWorkbook workbook = application.Workbooks.Open(Path.GetFullPath(@"Data/Input.xlsx"));
+
+                XlsIORenderer renderer = new XlsIORenderer();
+
+                PdfDocument pdfDocument = renderer.ConvertToPDF(workbook);
+
+                pdfDocument.Save(Path.GetFullPath("Output/WorkbookToPDF.pdf"));
+
+                pdfDocument.Close();
+                workbook.Close();
+            }
+
+            // Clear the registered fonts and dispose their associated streams
+            FontManager.ClearRegisteredFonts(true);
+        }
+    }
+}

Worksheet to Image/Custom Font/.NET/Custom Font/Custom Font.slnx

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+<Solution>
+  <Project Path="Custom Font/Custom Font.csproj" />
+</Solution>

Worksheet to Image/Custom Font/.NET/Custom Font/Custom Font/Custom Font.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <RootNamespace>Custom_Font</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+	<PackageReference Include="Syncfusion.XlsIORenderer.NET" Version="*" />
+  </ItemGroup>
+
+  <ItemGroup>
+	<None Update="Data\*">
+		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+	</None>
+	<None Update="Output\*">
+		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+	</None>
+	<None Update="Data\MyFonts\*">
+		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+	</None>
+  </ItemGroup>
+
+</Project>

Worksheet to Image/Custom Font/.NET/Custom Font/Custom Font/Program.cs

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+using Syncfusion.XlsIO;
+using Syncfusion.Drawing.Fonts;
+using Syncfusion.XlsIORenderer;
+
+namespace Custom_Font
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            // Create a collection to store the custom font streams
+            List<Stream> fontStreams = new List<Stream>();
+
+            // Retrieve all font files from the specified directory
+            foreach (string file in Directory.GetFiles(Path.GetFullPath(@"Data/MyFonts")))
+            {
+                string extension = Path.GetExtension(file);
+
+                // Load only TrueType and OpenType font files
+                if (extension.Equals(".ttf", StringComparison.OrdinalIgnoreCase) ||
+                    extension.Equals(".otf", StringComparison.OrdinalIgnoreCase))
+                {
+                    // Read the font file and copy its content to a memory stream
+                    FileStream fileStream = new FileStream(file, FileMode.OpenOrCreate, FileAccess.Read);
+                    Stream stream = new MemoryStream();
+                    fileStream.CopyTo(stream);
+                    stream.Position = 0;
+                    fontStreams.Add(stream);
+                }
+            }
+
+            // Register the custom fonts for use during Excel-to-Image conversion
+            FontManager.RegisterFonts(fontStreams);
+
+            using (ExcelEngine excelEngine = new ExcelEngine())
+            {
+                IApplication application = excelEngine.Excel;
+                application.DefaultVersion = ExcelVersion.Xlsx;
+
+                IWorkbook workbook = application.Workbooks.Open(Path.GetFullPath(@"Data/Input.xlsx"));
+                IWorksheet sheet = workbook.Worksheets[0];
+
+                application.XlsIORenderer = new XlsIORenderer();
+
+                using (FileStream outputStream = new FileStream(Path.GetFullPath("Output/Image.png"), FileMode.Create, FileAccess.Write))
+                {
+                    sheet.ConvertToImage(sheet.UsedRange, outputStream);
+                }
+            }
+
+            // Clear the registered fonts and dispose their associated streams
+            FontManager.ClearRegisteredFonts(true);
+        }
+    }
+}