Error when comparing two doc file

[Adithya Putra]

Found this error on specific file, idk whats wrong with the docx file

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')

at System.Collections.Generic.List`1.System.Collections.IList.get_Item

at Syncfusion.DocIO.DLS.ParagraphItemCollection.get_Item

at Syncfusion.DocIO.DLS.WParagraph.GetNextWord

at Syncfusion.DocIO.DLS.WParagraph.Compare

at Syncfusion.DocIO.DLS.WTextBody.Compare

at Syncfusion.DocIO.DLS.WordDocument.WordCompare

at Syncfusion.DocIO.DLS.WordDocument.Compare

at Syncfusion.DocIO.DLS.WParagraph.CompareFieldResult

at Syncfusion.DocIO.DLS.WParagraph.CompareField

at Syncfusion.DocIO.DLS.WParagraph.Compare

at Syncfusion.DocIO.DLS.WTextBody.Compare

at Syncfusion.DocIO.DLS.WSection.CompareHeaderFooter

at Syncfusion.DocIO.DLS.WordDocument.WordCompare

at Syncfusion.DocIO.DLS.WordDocument.Compare

at WebApplication1.Controllers.DocumentEditorController.CompareDocuments ( /app/Controllers/DocumentEditorController.cs:272 )

at WebApplication1.Controllers.DocumentEditorController.Compare ( /app/Controllers/DocumentEditorController.cs:253 )

at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute

[Adithya Putra]

Check the docx files

Attachment: Archive_3_ba71690c.zip

[Dharanya Sakthivel]

Hi Adithya,

We tried to reproduce the exception you are facing by comparing the provided documents on our end but we did not encounter any exception, and the comparison document was generated successfully. Kindly refer to the attached sample which we tried at our end.

If you are still facing the issue, kindly provide the following details:

1. Confirm if the problem occurs when running the attached sample on your side.
2. Share the complete code snippet or a sample that reproduces the issue.

Based on these details, we will proceed further to replicate the problem and then share more details about it.

Regards,
Dharanya.

Attachment: CompareWorddocuments_36581807.zip

[Adrian Scott]

The error you’re encountering, specifically System.ArgumentOutOfRangeException, occurs when attempting to access an index that is out of range within a collection. In the context of comparing two DOCX files using Syncfusion’s library, this usually points to an issue with the structure or content of the specific DOCX file.

Why This Happens

1. Corrupted or Malformed DOCX File: The file may have invalid formatting or unsupported elements that the Syncfusion library cannot process correctly.
2. Unsupported Elements in the Document: Features like complex fields, custom styles, or embedded objects may not be handled as expected during comparison.
3. Library Version Mismatch: Using an outdated version of the Syncfusion library may lead to errors when handling certain document elements.

How to Fix It

1. Validate the DOCX Files
   Open the problematic DOCX file in Microsoft Word and inspect it for any formatting issues. Use the "Inspect Document" feature in Word to detect and remove any problematic elements.

2. Update Syncfusion Library
   Ensure you are using the latest version of the Syncfusion DocIO library, as newer versions often include bug fixes and enhanced support for complex document elements.

3. Handle Exceptions Gracefully
   Modify your code to handle exceptions during the comparison process. For example:

   
   try  
   {  
       document1.Compare(document2, ComparisonOptions.Default);  
   }  
   catch (ArgumentOutOfRangeException ex)  
   {  
       // Log the error and handle gracefully  
       Console.WriteLine("Error comparing documents: " + ex.Message);  
   }  
   

4. Check Document Structure
   If the issue persists, parse the documents to identify problematic paragraphs, sections, or fields. You can iterate through the document body and log elements to pinpoint where the error occurs:

   
   foreach (WSection section in document.Sections)  
   {  
       foreach (WParagraph paragraph in section.Body.Paragraphs)  
       {  
           Console.WriteLine(paragraph.Text);  
       }  
   }  
   

5. Reach Out to Experts
   If you’re unable to resolve the issue, it may require specialized knowledge in Syncfusion and .NET Core. A trusted .NET Core development company, like CMARIX, can assist in diagnosing and fixing such errors efficiently.

[Dharanya Sakthivel]

Hi Adrian,

Thank you for your suggestions.

Adithya, kindly try the provided suggestions by checking whether the document is corrupted or if an older version of the packages is being used. To resolve this, verify if the Word document opens correctly in Microsoft Word, or update to the latest package version.

If you are still facing the issue, kindly provide the following details as mentioned earlier:

1. Confirm if the problem occurs when running the attached sample on your side.
2. Share the complete code snippet or a sample that reproduces the issue.

Based on these details, we will proceed further to replicate the problem and then share more details about it.

Regards,
Dharanya.