VB.NET PDF - Search and Find PDF Text in VB.NET

Best Visual Studio .NET PDF document SDK, built in .NET framework 2.0 and compatible with VB.NET programming language

Easy to search and find text content in multiple page adobe PDF files in .NET WinForms and ASP.NET

Search text in PDF images by using XDoc.PDF SDK for VB.NET

Support .NET WinForms, ASP.NET MVC in IIS, ASP.NET Ajax, Azure cloud service, DNN (DotNetNuke), SharePoint

Help to find and get PDF text position details in Visual Basic class program

Allow to search defined PDF file page or the whole document

Support various search options, like whole word, ignore case, match string, etc

Ability to search and replace PDF text programmatically in VB.NET

VB.NET class online source code and free VB.NET XDoc.PDF library and component are available

If the source PDF document is with multiple pages, it may be difficult for you to find certain text from the Microsoft PDF document page. Our VB.NET PDF Document Add-On enables you to search for text in target PDF document by using PDFPage class. Once you have found the text, various operations are available according to specific needs. For example, you can locate the searched text together with methods stated above.

API and VB.NET sample code below can be utilized to search for text in target PDF document in your Visual Studio project using VB language. Furthermore, if you are a Visual C# .NET programmer, you can go to this Visual C# tutorial for PDF text search in .NET project.

VB.NET Code Example of Finding Text

Add necessary references:

  RasterEdge.Imaging.Basic.dll

  RasterEdge.Imaging.Basic.Codec.dll

  RasterEdge.Imaging.Drawing.dll

  RasterEdge.Imaging.Font.dll

  RasterEdge.Imaging.Processing.dll

  RasterEdge.XDoc.Raster.dll

  RasterEdge.XDoc.Raster.Core.dll

  RasterEdge.XDoc.PDF.dll

Use corresponding namespaces;

  using RasterEdge.Imaging.Basic;

  using RasterEdge.XDoc.PDF;

  using RasterEdge.Imaging.Basic.TextSearch;

The following coding example illustrates how to perform PDF text searching function in your VB.NET project, including setting search option, creating search result, and saving the result.

Public Shared Function TestSearch(ByVal fileName As String, ByVal matchString As String, ByVal cacheFile As String)

    ' Set search options.
    Dim options As RESearchOption = New RESearchOption()
    options.SetMatchString(matchString)
    options.WholeWord = True
    options.IgnoreCase = True
    options.ContextExpansion = 30

    ' It will create a cach file if your PDF document is never been searched before. 
    If Not File.Exists(fileName) Then
        Dim document As BaseDocument = getBaseDocument(TestFilePath.InputFilePath + fileName)
        document.CacheSearchInfo(TestFilePath.InputFilePath + cacheFile)
    End If

    ' Create search result.
    Dim sResult As SearchResult = New SearchResult()

    ' Search and store the result in the entity of search structure.
    BaseDocument.Search(TestFilePath.InputFilePath + cacheFile, options, sResult)

End Function

Private Shared Function getBaseDocument(ByVal filePath As String) As BaseDocument

    Dim document As BaseDocument
    If filePath.EndsWith(".pdf") Then
        document = New PDFDocument(filePath)
    ElseIf (filePath.EndsWith(".docx")) Then
        document = New DOCXDocument(filePath)
    ElseIf (filePath.EndsWith(".xlsx")) Then
        document = New XLSXDocument(filePath)
    Else
        document = Nothing
    End If

    Return document

End Function