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PdfFileSource

Updated on Jun 3, 2026

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

Using PdfFileSource

Create an Instance

To create an instance of PdfFileSource, 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 also exposes an additional overload that allows you to keep the stream open after disposing the PdfFileSource instance. Pass true as the value for the second constructor parameter (leaveStreamOpen).

You can also use 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. Ensure the object is disposed when you are done with it. The best way to handle this is to wrap it in a using statement.

Members

PdfFileSource exposes the Pages property, which is of type PdfPageSource[] and allows you to 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, save the separated page with PdfStreamWriter.