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sameerkhan001sameerkhan001
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995608: Added detect black page code example in PDF document
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‎Pages/Detect-blank-pages-in-PDF/.NET Framework/Detect-blank-pages-in-PDF.slnx‎

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<Solution>
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<Project Path="Detect-blank-pages-in-PDF/Detect-blank-pages-in-PDF.csproj" />
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</Solution>

‎Pages/Detect-blank-pages-in-PDF/.NET Framework/Detect-blank-pages-in-PDF/App.config‎

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<?xml version="1.0" encoding="utf-8"?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
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</startup>
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<runtime>
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<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
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<dependentAssembly>
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<assemblyIdentity name="Syncfusion.Compression.Base" publicKeyToken="3d67ed1f87d44c89" culture="neutral" />
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<bindingRedirect oldVersion="0.0.0.0-100.2460.1.0" newVersion="100.2460.1.0" />
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</dependentAssembly>
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</assemblyBinding>
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</runtime>
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</configuration>

‎Pages/Detect-blank-pages-in-PDF/.NET Framework/Detect-blank-pages-in-PDF/Data/Input.pdf‎

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‎Pages/Detect-blank-pages-in-PDF/.NET Framework/Detect-blank-pages-in-PDF/Detect-blank-pages-in-PDF.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{4B7242BE-AF63-460E-9F18-8F7BBA75E15E}</ProjectGuid>
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<OutputType>Exe</OutputType>
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<RootNamespace>Detect_blank_pages_in_PDF</RootNamespace>
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<AssemblyName>Detect-blank-pages-in-PDF</AssemblyName>
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<TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
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<Deterministic>true</Deterministic>
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<NuGetPackageImportStamp>
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</NuGetPackageImportStamp>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="Syncfusion.Compression.Base, Version=100.2460.1.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
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<HintPath>..\packages\Syncfusion.Compression.Base.100.2.38\lib\net462\Syncfusion.Compression.Base.dll</HintPath>
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</Reference>
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<Reference Include="Syncfusion.ImagePreProcessor.Base, Version=32.2462.4.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
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<HintPath>..\packages\Syncfusion.ImagePreProcessor.WinForms.32.2.4\lib\net462\Syncfusion.ImagePreProcessor.Base.dll</HintPath>
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</Reference>
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<Reference Include="Syncfusion.Licensing, Version=32.2462.4.0, Culture=neutral, PublicKeyToken=632609b4d040f6b4, processorArchitecture=MSIL">
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<HintPath>..\packages\Syncfusion.Licensing.32.2.4\lib\net462\Syncfusion.Licensing.dll</HintPath>
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</Reference>
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<Reference Include="Syncfusion.OCRProcessor.Base, Version=32.2462.4.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
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<HintPath>..\packages\Syncfusion.Pdf.OCR.WinForms.32.2.4\lib\net462\Syncfusion.OCRProcessor.Base.dll</HintPath>
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</Reference>
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<Reference Include="Syncfusion.Pdf.Base, Version=32.2462.4.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
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<HintPath>..\packages\Syncfusion.Pdf.WinForms.32.2.4\lib\net462\Syncfusion.Pdf.Base.dll</HintPath>
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</Reference>
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<Reference Include="Syncfusion.PdfToImageConverter.Base, Version=32.2462.4.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
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<HintPath>..\packages\Syncfusion.PdfToImageConverter.WinForms.32.2.4\lib\net462\Syncfusion.PdfToImageConverter.Base.dll</HintPath>
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</Reference>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Drawing" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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<None Include="packages.config" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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<Import Project="..\packages\Syncfusion.PdfToImageConverter.WinForms.32.2.4\build\net462\Syncfusion.PdfToImageConverter.WinForms.targets" Condition="Exists('..\packages\Syncfusion.PdfToImageConverter.WinForms.32.2.4\build\net462\Syncfusion.PdfToImageConverter.WinForms.targets')" />
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<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
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<PropertyGroup>
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<ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
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</PropertyGroup>
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<Error Condition="!Exists('..\packages\Syncfusion.PdfToImageConverter.WinForms.32.2.4\build\net462\Syncfusion.PdfToImageConverter.WinForms.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Syncfusion.PdfToImageConverter.WinForms.32.2.4\build\net462\Syncfusion.PdfToImageConverter.WinForms.targets'))" />
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<Error Condition="!Exists('..\packages\Syncfusion.Pdf.OCR.WinForms.32.2.4\build\net462\Syncfusion.Pdf.OCR.WinForms.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Syncfusion.Pdf.OCR.WinForms.32.2.4\build\net462\Syncfusion.Pdf.OCR.WinForms.targets'))" />
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</Target>
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<Import Project="..\packages\Syncfusion.Pdf.OCR.WinForms.32.2.4\build\net462\Syncfusion.Pdf.OCR.WinForms.targets" Condition="Exists('..\packages\Syncfusion.Pdf.OCR.WinForms.32.2.4\build\net462\Syncfusion.Pdf.OCR.WinForms.targets')" />
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</Project>

‎Pages/Detect-blank-pages-in-PDF/.NET Framework/Detect-blank-pages-in-PDF/Program.cs‎

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using Syncfusion.Pdf;
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using Syncfusion.Pdf.Parsing;
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using Syncfusion.PdfToImageConverter;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Drawing;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Drawing.Imaging;
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namespace Detect_blank_pages_in_PDF
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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using (FileStream file = new FileStream(Path.GetFullPath("Data/Input.pdf"), FileMode.Open, FileAccess.Read))
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{
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// Load the existing PDF document
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PdfLoadedDocument ldoc = new PdfLoadedDocument(file);
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PdfToImageConverter converter = new PdfToImageConverter();
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converter.Load(file);
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List<int> emptyPages = new List<int>();
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for (int i = 0; i < ldoc.Pages.Count; i++)
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{
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PdfLoadedPage lpage = ldoc.Pages[i] as PdfLoadedPage;
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if (IsBlankPage(lpage, i, converter))
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{
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emptyPages.Add(i + 1); // +1 because pages are normally 1‑based
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Console.WriteLine($"Page {i + 1} is blank.");
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}
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}
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ldoc.Close(true);
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Console.WriteLine();
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Console.WriteLine($"Total blank pages: {emptyPages.Count}");
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}
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}
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// Determines whether a page is blank.
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private static bool IsBlankPage(PdfLoadedPage lpage, int pageIndex, PdfToImageConverter converter)
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{
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bool isBlankPage = false;
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if (lpage.Annotations.Count > 0)
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{
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isBlankPage = false;
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return isBlankPage;
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}
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// For images.
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System.Drawing.Image[] images = lpage.ExtractImages();
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if (images.Length > 0)
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{
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foreach (System.Drawing.Image img in images)
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{
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if (!IsEmpty(img as Bitmap))
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{
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isBlankPage = false;
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break;
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}
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else
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isBlankPage = true;
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}
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}
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else
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{
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//For shapes
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Stream imageSteam = converter.Convert(pageIndex, false, false);
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imageSteam.Position = 0;
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if (imageSteam != null && IsEmpty(new Bitmap(imageSteam)))
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{
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isBlankPage = true;
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}
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else
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{
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isBlankPage = false;
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}
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}
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return isBlankPage;
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}
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// Determines if a bitmap is "empty" by counting non-white pixels.
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private static bool IsEmpty(Bitmap image)
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{
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Rectangle bounds = new Rectangle(0, 0, image.Width, image.Height);
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BitmapData bmpData = image.LockBits(bounds, ImageLockMode.ReadWrite, image.PixelFormat);
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IntPtr ptr = bmpData.Scan0;
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int bytes = Math.Abs(bmpData.Stride) * image.Height;
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byte[] rgbValues = new byte[bytes];
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Marshal.Copy(ptr, rgbValues, 0, bytes);
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image.UnlockBits(bmpData);
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// Count non-white pixels
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int nonWhitePixelCount = rgbValues.Count(b => b != 255);
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// If less than 1% of pixels are non-white, consider it blank
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int threshold = (image.Width * image.Height) / 100; // 1%
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return nonWhitePixelCount < threshold;
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}
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}
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}

‎Pages/Detect-blank-pages-in-PDF/.NET Framework/Detect-blank-pages-in-PDF/Properties/AssemblyInfo.cs‎

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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("Detect-blank-pages-in-PDF")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("Detect-blank-pages-in-PDF")]
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[assembly: AssemblyCopyright("Copyright © 2026")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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// The following GUID is for the ID of the typelib if this project is exposed to COM
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[assembly: Guid("4b7242be-af63-460e-9f18-8f7bba75e15e")]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

‎Pages/Detect-blank-pages-in-PDF/.NET Framework/Detect-blank-pages-in-PDF/packages.config‎

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<?xml version="1.0" encoding="utf-8"?>
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<packages>
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<package id="Syncfusion.Compression.Base" version="100.2.38" targetFramework="net48" />
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<package id="Syncfusion.ImagePreProcessor.WinForms" version="32.2.4" targetFramework="net48" />
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<package id="Syncfusion.Licensing" version="32.2.4" targetFramework="net48" />
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<package id="Syncfusion.Pdf.OCR.WinForms" version="32.2.4" targetFramework="net48" />
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<package id="Syncfusion.Pdf.WinForms" version="32.2.4" targetFramework="net48" />
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<package id="Syncfusion.PdfToImageConverter.WinForms" version="32.2.4" targetFramework="net48" />
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</packages>

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