Question

The following line of code is causing me an Exception

plug.Instance.AddDocuments(new Int32[] { val_pid }, val_ptype, val_doccat, val_subcat, val_doctype, val_notes, val_summary, SummaryAppendOptions.None, val_docStatus, new String[] { PDFFile })

And this is the exception detail.

System.Exception was caught
 Message=Object reference not set to an instance of an object. - Error when trying to save    document
 Source=SimsBridge

 StackTrace:
   at SimsBridge.Bridge.AddDocuments(Int32[] personIds, Int32 PersonType, String docCatagory, Int32 subCatagory, String docType, String notes, String summary, SummaryAppendOptions summaryOptions, String documentStatusCode, String[] filePaths)
   at ManagedScanDesktop.Form1.SimsScanComplete(String[] files) in C:\Working\ManagedScanDesktop 1.8\v1.8\ManagedScanDesktop\ManagedScanDesktop\Form1.cs:line 2619
InnerException: 

I’m not looking for a solution to the actual exception.

My question is, does the stacktrace point to which part of the method doesn’t have a reference set? Or is stacktrace just to trace to where the method is called?

Answer 1

The stack trace shows you the call stack when an exception is thrown. From what you’ve provided you can only deduce that an exception was thrown from AddDocuments. Any of the reference type parameters passed in could be null. The best way to pinpoint the problems is to set a breakpoint and than inspect the values.