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2
Votes

PdfPageLayerCollection.Clear() only removes the first layer

Minimum working example




//Load the existing PDF document





using var samplePdf = new FileStream("Sample.pdf", FileMode.Open, FileAccess.Read);
using var document = new PdfLoadedDocument(samplePdf);
// Clear each page's layers
foreach (PdfLoadedPage page in document.Pages)


{ 
    //Remove the layers 
    page.Layers.Clear();


}




//Save the document




using var samplePdf2 = new FileStream("Sample_ClearedLayers.pdf", FileMode.Create, FileAccess.Write);





document.Save(samplePdf2);

I have inspected the method and noticed that the m_page is set to null but used as an early return condition.

// Summary:
//     Clears layers from the Syncfusion.Pdf.PdfPageLayerCollection.
public void Clear()
{
    int i = 0;
    for (int count = base.List.Count; i < count; i++)
    {
        PdfPageLayer layer = this[i];
        RemoveLayer(layer);
        m_page = null; // <- should probably be set after the for-loop
    }
    base.List.Clear();}
// Summary:
//     Removes layer from the page.
// Parameters:
//   layer:
//     The layer.
private void RemoveLayer(PdfPageLayer layer)
{
    if (layer == null)
    {
        throw new ArgumentNullException("layer not to be null");
    }
    PdfDictionary pdfDictionary = null;
    if (m_page == null)
    {
        return; // <- early return that causes only the first layer being removed
    }
    // ...
}

After calling Clear() the layer collection itself thinks it has no layers, but the saved pdf at the end still has 2 layers.