PdfPageFacade.ClearContent(PdfClearContentRegions, PdfClearContentOptions) Method

Clears the document content located in the specified regions. Allows you to set what content type to keep in these regions.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Pdf.v25.1.Core.dll

NuGet Package: DevExpress.Pdf.Core

Declaration

C#

public void ClearContent(
    PdfClearContentRegions regions,
    PdfClearContentOptions options
)

VB.NET

Public Sub ClearContent(
    regions As PdfClearContentRegions,
    options As PdfClearContentOptions
)

Parameters

Name	Type	Description
regions	PdfClearContentRegions	Page regions to clear.
options	PdfClearContentOptions	Options that specify what content type to keep in target regions.

Remarks

The code sample below removes all entries of a specific phrase from the first page;

C#

using (PdfDocumentProcessor pdfDocumentProcessor = new PdfDocumentProcessor())
{
    // Load a document
    pdfDocumentProcessor.LoadDocument("Document.pdf");
    PdfClearContentRegions contentRegions = new PdfClearContentRegions();

    // Find the target phrase in the document
    string removeText = "Ounce";

    PdfTextSearchParameters searchParameters = new PdfTextSearchParameters()
    {
       WholeWords = true
    };

    PdfTextSearchResults searchResults = pdfDocumentProcessor.FindText(removeText, searchParameters);

    while (searchResults.Status == PdfTextSearchStatus.Found && searchResults.PageNumber == 1)
    {
        // Add text rectangles to the region collection:
        contentRegions.Add(searchResults.Rectangles);
        searchResults = pdfDocumentProcessor.FindText(removeText, searchParameters);
    }

    // Get the first page properties
    PdfPageFacade pageFacade = pdfDocumentProcessor.DocumentFacade.Pages[0];

    // Specify what content type to keep in target areas
    PdfClearContentOptions options = new PdfClearContentOptions()
    {
        ClearAnnotations = false,
        ClearGraphics = false,
        ClearImages = false
    };

    // Remove found entries
    pageFacade.ClearContent(contentRegions, options);

    // Save the result
    pdfDocumentProcessor.SaveDocument("Document_cleared.pdf");
}

VB.NET

Using pdfDocumentProcessor As New PdfDocumentProcessor()
  ' Load a document
  pdfDocumentProcessor.LoadDocument("Document.pdf")

  Dim contentRegions As New PdfClearContentRegions()

  ' Find the target phrase in the document
  Dim removeText As String = "Ounce"
  Dim searchParameters As New PdfTextSearchParameters() With {.WholeWords = True}
  Dim searchResults As PdfTextSearchResults = pdfDocumentProcessor.FindText(removeText, searchParameters)

  Do While searchResults.Status = PdfTextSearchStatus.Found AndAlso searchResults.PageNumber = 1
    ' Add text rectangles to the region collection:
    contentRegions.Add(searchResults.Rectangles)
    searchResults = pdfDocumentProcessor.FindText(removeText, searchParameters)
  Loop

  ' Get the first page properties
  Dim pageFacade As PdfPageFacade = pdfDocumentProcessor.DocumentFacade.Pages(0)

  ' Specify what content type to keep in target areas
  Dim options As New PdfClearContentOptions() With
     {.ClearAnnotations = False, .ClearGraphics = False, .ClearImages = False}

  ' Remove found entries
  pageFacade.ClearContent(contentRegions, options)

  ' Save the result
  pdfDocumentProcessor.SaveDocument("Document_cleared.pdf")
End Using