[Mono-bugs] [Bug 537091] New: Remote debugger: Nullreference when hovering instance variable.

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sun Sep 6 12:05:36 EDT 2009


           Summary: Remote debugger: Nullreference when hovering instance
    Classification: Mono
           Product: Mono: Tools
           Version: 2.4.x
          Platform: x86-64
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Visual Studio Integration
        AssignedTo: jpobst at novell.com
        ReportedBy: loftum at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Component Test

Description of Problem:

During a debugging session, I want to hover a variable, and get the values of
its properties.
When I hover the variable, and press the plus-sign of the small property
window/square that appears, I get a message window with a Nullreference
I don't get any info about the variable.

Steps to reproduce the problem:
1. Open the attached ASP.NET solution (AspNetDemo.sln) in Visual Studio with
Mono Tools installed.
2. add a breakpoint at Default.aspx.cs at line 24:
Line 24: IList<Data> dataList = _dataDao.GetData();  // Bookmark this line
Line 25: DataTable dataTable = CreateDataTable();

3. Start a remote debugging session of the application.
4. When the bookmark highlights, "step over" to line 25.
5. Hover the variable dataList, and press the plus-sign in the small variable
window that appears.

Actual Results:
ERROR: Format Object:
System.NullReferenceException: Object reference not set to an instance of an
  at Mono.VisualStudio.Mdb.ObjectFormatter.DoFormatObject
(Mono.VisualStudio.Mdb.ServerProperty property,
Mono.Debugger.Languages.TargetObject obj) [0x00000] in
  at Mono.VisualStudio.Mdb.ObjectFormatter.FormatObject
(Mono.VisualStudio.Mdb.ServerProperty property) [0x00000] in

Expected Results:
The window should expand with the variable's properties and values.

How often does this happen? 
Every time.

Additional Information:

The solution in which the problem appears is attached.
Development machine: Win XP Pro
Target machine: SuSE VMWare image provided with Mono tools for Visual Studio
preview version (On VMWare player).

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