Diagnostic Analyzers

The following are the diagnostic analyzers installed with the Microsoft.VisualStudio.Threading.Analyzers NuGet package.

ID	Title	Severity	Supports	Default diagnostic severity
VSTHRD001	Avoid legacy thread switching methods	Critical	1st rule	🔡 Warning
VSTHRD002	Avoid problematic synchronous waits	Critical	2nd rule	Warning
VSTHRD003	Avoid awaiting foreign Tasks	Critical	3rd rule	Warning
VSTHRD004	Await SwitchToMainThreadAsync	Critical	1st rule	Error
VSTHRD010	Invoke single-threaded types on Main thread	Critical	1st rule	Warning
VSTHRD011	Use `AsyncLazy<T>`	Critical	3rd rule	Error
VSTHRD012	Provide JoinableTaskFactory where allowed	Critical	All rules	Warning
VSTHRD100	Avoid `async void` methods	Advisory		Warning
VSTHRD101	Avoid unsupported async delegates	Advisory	VSTHRD100	Warning
VSTHRD102	Implement internal logic asynchronously	Advisory	2nd rule	Info
VSTHRD103	Call async methods when in an async method	Advisory		Warning
VSTHRD104	Offer async option	Advisory		Info
VSTHRD105	Avoid method overloads that assume `TaskScheduler.Current`	Advisory		Warning
VSTHRD106	Use `InvokeAsync` to raise async events	Advisory		Warning
VSTHRD107	Await Task within using expression	Advisory		Error
VSTHRD108	Assert thread affinity unconditionally	Advisory	1st rule, VSTHRD010	Warning
VSTHRD109	Switch instead of assert in async methods	Advisory	1st rule	Error
VSTHRD110	Observe result of async calls	Advisory		Warning
VSTHRD111	Use `.ConfigureAwait(bool)`	Advisory		Hidden
VSTHRD200	Use `Async` naming convention	Guideline	VSTHRD103	Warning

Severity descriptions

Severity	IDs	Analyzer catches...
Critical	1-99	Code issues that often result in deadlocks
Advisory	100-199	Code that may perform differently than intended or lead to occasional deadlocks
Guideline	200-299	Code that deviates from best practices and may limit the benefits of other analyzers

Icon	Meaning
🔡	The analyzer only produces diagnostics when configured.

Some analyzers' behavior can be configured. See our configuration topic for more information.