![]() There are two subtle differences between using the element in your csproj file, and using the warnaserror MSBuild command line switch. ![]() Use WarningLevel to specify the level of warnings that you want the compiler to display. The set of all nullability warnings can be specified with the Nullable shorthand. Optionally, if you want only a few specific warnings to be treated as errors, you may specify a comma-separated list of warning numbers to treat as errors. By default, TreatWarningsAsErrors isn't in effect, which means warnings don't prevent the generation of an output file. The build process halts (no output files are built). trueĪll warning messages are instead reported as errors. If you turn on TreatWarningsAsErrors, you can use WarningsNotAsErrors to list warnings that shouldn't be treated as errors. You can also use the TreatWarningsAsErrors to set only some warnings as errors. The TreatWarningsAsErrors option treats all warnings as errors. Use TreatWarningsAsErrors to treat all warnings as errors. ![]() For other ways to get information about an error or warning, see C# Compiler Errors. To get information about an error or warning, you can look up the error code in the Help Index. previewĭisplays all optional warning wave 5 warnings.ĭisplays all optional warning wave 6 warnings.ĭisplays all optional warning wave 7 warnings.ĭisplays all informational warnings up to and including the current release.ĭisplays all informational warnings up to and including the latest preview release.įor more information on optional warnings, see Warning waves. Analyzers provide lint-like capability to improve your code. Warning wave warnings are additional checks that improve your code, or ensure it will be compatible with upcoming releases. The AnalysisLevel option specifies additional warning waves and analyzers to enable. Use DisabledWarnings to disable certain warnings. NET SDK sets the WarningLevel to match the AnalysisLevel in your project file. The compiler command line accepts values greater than 4 to enable warning wave warnings. Turns off emission of all warning messages.ĭisplays level 1 warnings plus certain, less-severe warnings, such as warnings about hiding class members.ĭisplays level 2 warnings plus certain, less-severe warnings, such as warnings about expressions that always evaluate to true or false.ĭisplays all level 3 warnings plus informational warnings. The value must be zero or a positive integer: Warning level The element value is the warning level you want displayed for the compilation: Lower numbers show only high severity warnings. ![]() The WarningLevel option specifies the warning level for the compiler to display. ReportAnalyzer / -reportanalyzer: Report additional analyzer information, such as execution time.ErrorLog / -errorlog: Specify a file to log all compiler and analyzer diagnostics.CodeAnalysisRuleSet / -ruleset: Specify a ruleset file that disables specific diagnostics.NoWarn / -nowarn: Set a list of disabled warnings.WarningsNotAsErrors / -warnnotaserror: Treat one or more warnings not as errors.WarningsAsErrors / -warnaserror: Treat one or more warnings as errors.TreatWarningsAsErrors / -warnaserror: Treat all warnings as errors.AnalysisLevel: Set optional warning level.WarningLevel / -warn: Set warning level.The older csc.exe syntax is shown in code style. The following options control how the compiler reports errors and warnings.
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