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Silverlight Debugging

Silverlight Debugging. Alan Cobb Independent .NET Consultant Alan Cobb & Associates, Inc. Sacramento, CA Silicon Valley Code Camp 2008 Saturday, November 8, 2008, 3:45pm. About Alan Cobb. Independent consultant for over 20 years on Microsoft platforms Silverlight, WPF, .NET, C#, C++

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Silverlight Debugging

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  1. Silverlight Debugging Alan Cobb Independent .NET Consultant Alan Cobb & Associates, Inc. Sacramento, CA Silicon Valley Code Camp 2008 Saturday, November 8, 2008, 3:45pm

  2. About Alan Cobb • Independent consultant for over 20 years on Microsoft platforms • Silverlight, WPF, .NET, C#, C++ • One of directors of the SacDotNet User Group • http://www.alancobb.com • http://www.alancobb.com/blog

  3. Another Code Camp Session • “WCF Debugging – Where Do I Start” • Presented by: Petar Vucetin • 9:15AM Sunday: Room 4204 • See also Web Service debugging section of Silverlight documentation: • “Debugging Services for Silverlight Applications”

  4. Presentation Overview • Beginning: • Setting up VS2008 for SL debugging • Alternatives for SL tracing • Intermediate: • SL debugging tools: Fiddler, Silverlight Spy • Advanced: • Performance debugging • SOS extension: Low level .NET debugging

  5. Description on Website • This session will survey a range of Silverlight 2 debugging tools and techniques. At the beginner level we’ll review setting up VS2008 for debugging Silverlight C# and JavaScript code. Then we’ll look at different techniques for trace logging. At an intermediate level we’ll cover three debugging tools I use extensively: Fiddler, Silverlight Spy and NetLimiter. At the advanced level we’ll do some low-level Silverlight .NET debugging with WinDbg and the SOS debugger extension DLL. SOS helps you hunt for memory leaks by giving you a detailed view of the managed heap. Stack traces from SOS can sometimes reveal more about the context of bugs than VS2008 can.

  6. Beginning Level Issues : • Setting up VS 2008 for SL debugging: • Know where the settings are • Turn on 1st chance exception handling • Alternatives for Tracing in SL: • Debug.WriteLine and DebugView • Clog for Silverlight

  7. Setting up VS2008 • Use a Web Application Project • Turn on 1st chance exception handling • Where are the settings? • VS itself, Your project, Web.config, Internet Explorer • Types of breakpoints: • JS, .NET client and server side

  8. Turn on: “break when exception thrown”

  9. Turn on: “break when exception thrown”

  10. Which code? Running Where? Client: Server: Managed: C# Managed: C# Your SL code: Your Web-Service code: Managed: C# / VB JavaScript Managed: C# / VB Silverlight itself: .NET framework: Un-managed: C++ Un-managed: C++

  11. Main Silverlight DLLs

  12. SL Tracing: Debug.WriteLine

  13. SL Tracing: DebugView

  14. SL Tracing: DebugView

  15. SL2 Tracing: CLog

  16. Fiddler • What is it? • HTTP proxy server • What can you do with it? • Watching browser talk to Silverlight sites • Debugging cross domain policy file issues • Timing analysis (slow connection tests)

  17. Fiddler: Watch HTTP conversation

  18. Reflector

  19. Getting generic.xaml with Reflector

  20. Fiddler Demo: Little Loader App

  21. Fiddler: Slow Connection Testing

  22. Fiddler: Download Timing Analysis

  23. Silverlight Spy • How is Silverlight Spy constructed? • Features: • Browse Silverlight element tree • Fly over element tree • See element statistics • Copy XAML for a given branch • Modify element properties interactively • Other

  24. Demo: Silverlight Spy

  25. Debugging Performance Issues • SeemaRamchandani’sPDC2008 talk • FrameRate: • Host.Settings.MaxFrameRate • Host.Settings.EnableFrameRateCounter • CompositionTarget.Rendering event • Host.Settings.EnableRedrawRegions • Profiling: • Xperf ? (A free “profiler” from MS)

  26. Performance: The Render Loop

  27. Performance Instrumentation Demo

  28. SOS: Low-level .NET Debugging • What is SOS? • Extension DLL for WinDbg debugger • Downloading WinDbg setting up SOS • Intro articles on Silverlight and SOS: 1, 2 • Pointing at Microsoft symbol server • What can you use it for? • Examine Silverlight’s managed heap • Get more detailed stack traces

  29. SOS: Where is SOS.DLL?

  30. SOS Demo: Exception and Hang

  31. SOS Demo: Detailed Stack Traces

  32. SOS Demo: Finding Memory Leak

  33. SOS Demo: Finding Memory Leak

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