Error! Unknown op code for conditional

Question

I am using Aspose.Words to do the MailMerge. But after merge for a merge field, It is showing Error! Unknown op code for conditional in document itself. This error may be due to incorrectly formed merged field. But my requirement is to detect/catch such error through code. Because, in our case user themselves creates the word template and upload into system. I have written very simple code to read do the mail merge.

doc.MailMerge.Execute(this.DataSource.Rows[rowIndex];

Can we detect such error in code? I tried to find online, but nothing useful could find.

Answer 1

No exception will be thrown in this scenario, but you can catch using the result of field after merging. Try the below sample code

// Load the document
Aspose.Words.Document doc = new Aspose.Words.Document(src);
// Do processing and mail merge etc

// Select all field start nodes so we can find the merge fields.
NodeCollection fieldStarts = doc.GetChildNodes(NodeType.FieldStart, true);
foreach (FieldStart fieldStart in fieldStarts)
{
    // Get the next sibling
    Run fieldResult = (Run)fieldStart.NextSibling;

    // Match the error code with the result
    if (fieldResult.NextSibling.NextSibling.GetText().Equals("Error! Unknown op code for conditional.", StringComparison.CurrentCultureIgnoreCase))
    {
        // Find the page number, where the field is present
        LayoutCollector collector = new LayoutCollector(doc);
        int pageNumber = collector.GetStartPageIndex(fieldStart);
        Console.WriteLine("Error in field at Page: " + pageNumber + ". Field text: " + fieldResult.GetText());
    }
}