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PdfFileSource

Updated on Feb 19, 2026

The PdfFileSource class represents the content of an existing PDF file.

Using PdfFileSource

Create an Instance

To create an instance of PdfFileSource, you should pass a FileStream object, containing the PDF document, to the constructor of the class.

Example 1: Create a PdfFileSource

using (PdfFileSource fileSource = new PdfFileSource(File.OpenRead(path)))
{
    //...
}

PdfFileSource exposes also an additional overload, which allows you to keep the stream you are working with open after disposing the PdfFileSource instance by passing true as a value for the second constructor parameter (leaveStreamOpen).

An additional option you can use is the overload that accepts a parameter of type PdfImportSettings. This overload enables you to handle password encrypted documents.

Example 2: Open encrypted document

public void ReadDocument(string path)
{
    PdfImportSettings importSettings = new PdfImportSettings();
    importSettings.UserPasswordNeeded += Settings_UserPasswordNeeded;

    using (PdfFileSource fileSource = new PdfFileSource(File.OpenRead(path), importSettings, leaveStreamOpen: false))
    {
        //...
    }
}

private void Settings_UserPasswordNeeded(object sender, PasswordNeededEventArgs e)
{
    e.Password = "pass";
}

PdfFileSource inherits from IDisposable. Make sure the object is disposed when you are done with it. The best way to ensure this is handled properly is to wrap it in a using statement.

Members

PdfFileSource exposes the Pages property, which is of type PdfPageSource[] and allows you access the pages of the imported document.

Example 3: Iterate the pages of a document

using (PdfFileSource fileSource = new PdfFileSource(File.OpenRead(path)))
{
    foreach (PdfPageSource pageSource in fileSource.Pages)
    {
        //...
    }
}

You can use the indexer of the Pages property to obtain a specific page of the document and split it. Then, you can save the separated page using PdfStreamWriter.