'.net word interop: word.Documents.Open returns null

I'm using .net .4.6.1 and trying to do a mail merge. When i run the following code, which has a valid path to a word (.doc) document, it returns null.

C#

object fileName = pathToDocument;

doc = word.Documents.Open(ref fileName,
    ref missing, ref missing, ref missing, ref missing,
    ref missing, ref missing, ref missing, ref missing,
    ref missing, ref missing, ref missing, ref missing,
    ref missing, ref missing, ref missing);

Any advice appreciated.

Thanks,

Chris

c++sharpoffice-interop


Solution 1:[1]

The signature of the Open method is really confusing but it can be treated with more of a common sense approach, try something like this adjusting the file path of your document ...

static void Main(string[] args)
{
    var fileName = "c:\\temp\\Test.docx";

    var wdApplication = new Microsoft.Office.Interop.Word.Application();
    var wdDocument = wdApplication.Documents.Open(fileName);

    Console.WriteLine(wdDocument.Words.Count);

    wdDocument.Close();
    wdApplication.Quit();
}

Solution 2:[2]

Word deals with local files only. You need to copy the file locally and then use the Word object model to open it.

The Documents.Open method doesn't require the ref keyword for passing parameters:

doc = word.Documents.Open(pathToDocument,
    ref missing, ref missing, ref missing, ref missing,
    ref missing, ref missing, ref missing, ref missing,
    ref missing, ref missing, ref missing, ref missing,
    ref missing, ref missing, ref missing);

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Skin
Solution 2

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