How to disable spellcheck for form field Textbox in WPF PDF Viewer?

5 mins read

In the WPF PDF Viewer, there is no direct support to disable the spellcheck for the form field textbox programmatically. To disable the spellcheck for the form field textbox in the PDF document. Load the document in PdfLoadedDocument and disable `SpellCheck` property for the form field textbox, save and load the PDF in PdfViewer.

Steps to disable spellcheck for Textbox in PDF

Step 1: Get the instance of the loaded document from the file path of a PDF:

//Load a PDF into the PdfLoadedDocument object.
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(filePath);

Step 2: Disable spellcheck:

Iterate the form fields elements using loaded document.
Then disable the `SpellCheck` property for PdfLoadedTextBoxField.

foreach (PdfField field in loadedDocument.Form.Fields)
{
if(field is PdfLoadedTextBoxField)
{
PdfLoadedTextBoxField loadedTextBoxField = field as PdfLoadedTextBoxField;
loadedTextBoxField.SpellCheck = false;
}
}

Step 3: Save the modified document:

Save the modified loadedDocument in the memory stream.

 //Save the modified pdfLoadedDocument in the memory stream.
MemoryStream stream = new MemoryStream();
stream.Position = 0;
loadedDocument.Save(stream);

Step 4: Load the modified document:

Load the modified MemoryStream document in the pdfviewercontrol.

//Load the modified MemoryStream in the pdfviewercontrol.
pdfViewer.Load(stream);

View the Sample on GitHub