SYSLIB diagnostics for regex source generation
The following table shows the diagnostic IDs for regex source-generation analyzers in .NET 7 and later versions. SYSLIB1045
automatically alerts you to places that you can use source generation to generate the regular expression engine implementation at compile time. The remaining diagnostics alert you to errors related to usage of the source generator.
Diagnostic ID | Description |
---|---|
SYSLIB1040 |
Invalid GeneratedRegexAttribute usage. |
SYSLIB1041 |
Multiple GeneratedRegexAttribute attributes were applied to the same method, but only one is allowed. |
SYSLIB1042 |
The specified regular expression is invalid. |
SYSLIB1043 |
A GeneratedRegexAttribute method must be partial, parameterless, non-generic, and non-abstract, and return Regex. |
SYSLIB1044 |
The regex generator couldn't generate a complete source implementation for the specified regular expression due to an internal limitation. See the explanation in the generated source for more details. |
SYSLIB1045 |
Use GeneratedRegexAttribute to generate the regular expression implementation at compile time. |
For more information about source generation for regular expressions, see .NET regular expression source generators.
It's recommended that you use one of the workarounds when possible. However, if you cannot change your code, you can suppress the warning through a #pragma
directive or a <NoWarn>
project setting. If the SYSLIB1XXX
source generator diagnostic doesn't surface as an error, you can suppress the warning in code or in your project file.
To suppress the warnings in code:
// Disable the warning.
#pragma warning disable SYSLIB1006
// Code that generates compiler diagnostic.
// ...
// Re-enable the warning.
#pragma warning restore SYSLIB1006
To suppress the warnings in a project file:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
<!-- NoWarn below suppresses SYSLIB1002 project-wide -->
<NoWarn>$(NoWarn);SYSLIB1002</NoWarn>
<!-- To suppress multiple warnings, you can use multiple NoWarn elements -->
<NoWarn>$(NoWarn);SYSLIB1002</NoWarn>
<NoWarn>$(NoWarn);SYSLIB1006</NoWarn>
<!-- Alternatively, you can suppress multiple warnings by using a semicolon-delimited list -->
<NoWarn>$(NoWarn);SYSLIB1002;SYSLIB1006;SYSLIB1007</NoWarn>
</PropertyGroup>
</Project>
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