Disable spell checking in Word document using VSTO

Question

I am trying to disable spell checking in the currently active Word document using a VSTO add-in. I want to avoid saving the spelling errors in the document's Open XML markup.

I tried to use the Range.NoProofing property.

currentDocument.Content.NoProofing = 1;

The MSDN documentation states that this should be set to true, however, the property's type is int. I tried setting it to 1, but it doesn't work (spell checking errors still appear in the document). In the debugger I see that the property is still set to 0 after the assignment.

How to properly use the Range.NoProofing property or is there any other way to disable spell checking in a Word document?

Marek Dzikiewicz · Accepted Answer · 2013-11-08 13:57:07Z

I ended up ignoring all spelling errors before saving the document using the DocumentBeforeSave event.

this.application.DocumentBeforeSave += this.OnDocumentBeforeSave;

The NoProofing property seems to work properly when used on ranges which contain spelling errors.

private void OnDocumentBeforeSave(Document doc, ref bool saveAsUi, ref bool cancel) { // Ignore all spelling errors in the document foreach (Range error in this.application.ActiveDocument.SpellingErrors) { error.NoProofing = 1; } // Ignore all spelling errors in content controls foreach (ContentControl control in this.application.ActiveDocument.ContentControls) { control.Range.NoProofing = 1; } }

Herb F · Accepted Answer · 2025-03-17 15:36:07Z

I've always used -1 to be true in VSTO and in a few places it seems to matter compared to using 1 for true.

I needed to disable spell check on all endnotes. The answer of using NoProofing worked, but I later found an easier way to change the "Endnote Text" style to add NoProofing as -1.

In my code this is:

wordDocument.Styles[Word.WdBuiltinStyle.wdStyleEndnoteText].NoProofing = -1;

This can be done with other styles as well.

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