ค้นหาไฟล์ PDF ใน C#

//Search Text from All the Pages of PDF Document
Document pdfDocument = new Document("SearchAndGetTextFromAll.pdf");

// Create TextAbsorber object to find all instances of the input search phrase
TextFragmentAbsorber textFragmentAbsorber = new TextFragmentAbsorber("text");

// Accept the absorber for all the pages
pdfDocument.Pages.Accept(textFragmentAbsorber);

// Get the extracted text fragments
TextFragmentCollection textFragmentCollection = textFragmentAbsorber.TextFragments;

// Loop through the fragments
foreach (TextFragment textFragment in textFragmentCollection)
{

    Console.WriteLine("Text : {0} ", textFragment.Text);
    Console.WriteLine("Position : {0} ", textFragment.Position);
    Console.WriteLine("XIndent : {0} ", textFragment.Position.XIndent);
    Console.WriteLine("YIndent : {0} ", textFragment.Position.YIndent);
    Console.WriteLine("Font - Name : {0}", textFragment.TextState.Font.FontName);
    Console.WriteLine("Font - IsAccessible : {0} ", textFragment.TextState.Font.IsAccessible);
    Console.WriteLine("Font - IsEmbedded : {0} ", textFragment.TextState.Font.IsEmbedded);
    Console.WriteLine("Font - IsSubset : {0} ", textFragment.TextState.Font.IsSubset);
    Console.WriteLine("Font Size : {0} ", textFragment.TextState.FontSize);
    Console.WriteLine("Foreground Color : {0} ", textFragment.TextState.ForegroundColor);
}