C#合并PDF，无水印

D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\MergePDF.exe.config D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\MergePDF.exe D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\MergePDF.pdb D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\BouncyCastle.Crypto.dll D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\itextsharp.dll D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\Microsoft.CSharp.dll D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\Spire.Pdf.dll D:\WorkPlace\ProjectFile\MergePDF\bin\Debug\Microsoft.mshtml.dll D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.frmPDF.resources D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.Properties.Resources.resources D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.csproj.GenerateResource.cache D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.csproj.CoreCompileInputs.cache D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.csproj.CopyComplete D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.exe D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.pdb D:\WorkPlace\ProjectFile\MergePDF\obj\Debug\MergePDF.csproj.AssemblyReference.cache