My talk from the Odessa .NET User Group - http://www.usergroup.od.ua/2019/02/microsoft-net-user-group.html Source can be found here: https://github.com/tamirdresher/DebuggingTricks Do you know what developers do most of their day (except for surfing the internet)? Writing code? WRONG! They are debugging. The debugger is a powerful tool, but in this talk you'll learn tricks that will help find bugs in half the time and with less frustration. Because a happy developer is a productive developer. I'll show you to use tools that will point to you to right direction and features didn't know that are even there, for both development time debugging and post-mortem production analysis.

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Tamir Dresher (@tamir_dresher)
Chief Architect @ Clarizen
Debugging tricks you wish you
knew

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Debugging is a time-travel
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Tamir Dresher
• Chief Architect @
• Software Engineering Lecturer @ Ruppin Academic Center
• Book Author
• Rx.NET in Action (Manning)
• Full Stack Web Development with ASP.NET Core
• @tamir_dresher
• http://www.TamirDresher.com
About Me

4. I N T E R N A L & E X T E R N A L C O L L A B O R AT I O N
A U T O M AT E D W O R K F L O W E N G I N E
REPORTS & DASHBOARDS
MOBILE APPS & BOTS
INTEGRATIONS
APPSMARKETPLACE
RESOURCE
MANAGEMENT
TIME &
EXPENSES
FINANCIAL
PLANNING
DEMAND
MANAGEMENT
PROJECT
MANAGEMENT
PORTFOLIO
MANAGEMENT
~2,000 CUSTOMERS IN
124 COUNTRIES
99.95%
UPTIME
ENTERPRISE GRADE
SaaS SOLUTION
FOUNDED IN
2006
CLARIZEN - ENTERPRISE WORK COLLABORATION

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AGENDA
o Debugging a real-life
problem
o Tips and Tricks
o Exceptions
o Breakpoints
(JustMyCode, External Code)
o Debugging Multithreaded
Applications
o Symbols
o Post-mortem & Production
Debugging
o Debugging LINQ
(if time allows)
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The following events
are based on a true story

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Demo application – ToDo Items in Notebooks7

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The import bug

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The import bug

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The import bug

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What EF got to do with all this? (or EF Migrations ugly side)
MigrationId ContextKey Model Product
Version
Migration1 1010…
Migration2 1110…
Application
Migration1
Migration2
Migration3
Database
__MigrationHistory
Compare Migrations
Run Migration(s)

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Mastering exceptions

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Mastering exceptions – Catching ALL exceptions

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Finding the bug in the code (1)29

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When the migration did work – after restart

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Finding the bug in the code (2)31

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Finding the bug in the code (3)32

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Assemblies Load Failures
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Why can’t it load the refence assembly?

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Fusion log view - Fuslogvw
• Assembly Binding Log Viewer
• Set the registry keys under: HKLMSoftwareMicrosoftFusion

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procmon

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Breakpoints
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Method Breakpoints
*If you type a method name (without parameters) VS select all overloads

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Conditional Breakpoints

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Conditional Breakpoints (OzCode)
invoice.Id915486 intinvoice.Id915486 int

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Object Tracking Story

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Multithreading
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Staying on the same thread (freezing other threads)

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Tracepoints (VS) (a.k.a Printf debugging)
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Tracepoints (OzCode)

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Show All Instances
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Finding Tasks Deadlocks
• Debug –> windows –> Tasks

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Production Time and Post-Mortem Debugging
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Debugging *.exe Files

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VS Crashes
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Debugging VS53

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Attaching to VS54

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Attaching to VS

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Dumps
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Automatic Dump Creation
▪ To enable it, set the reg key
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsWindows Error
ReportingLocalDumps
─ DumpFolder – Location for the output dumps
─ DumpCount – Maximum amount of dumps in the folder
─ DumpType
➢ 1 – Mini Dump
➢ 2 – Full Dump
➢ 0 – Custom Dump
─ CustomDumpFlags – if DumpType is 0, set the dump options

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Debugging the Dump (1)
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Debugging the Dump (2)
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SUMMARY
o Debugging a real-life
problem
o Tips and Tricks
o Exceptions
o Breakpoints
(JustMyCode, External Code)
o Debugging Multithreaded
Applications
o Symbols
o Post-mortem & Production
Debugging
o Debugging LINQ
(if time allows)
63

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Tamir Dresher
@tamir_dresher
64
Thank you!

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Export
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Custom Expressions
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Give it a try
https://github.com/oz-code/OzCodeDemo

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Predict
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Comparing Instances
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The object is later available in every watch window
Make object ID
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OzCode Comapre
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