SYSLIB0034: CmsSigner(CspParameters) constructor is obsolete

The CmsSigner(CspParameters) constructor is marked as obsolete, starting in .NET 6. Using this API in code generates warning SYSLIB0034 at compile time.

Workaround

Use an alternative constructor.

Suppress a warning

If you must use the obsolete APIs, you can suppress the warning in code or in your project file.

To suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the warning.

// Disable the warning.
#pragma warning disable SYSLIB0034

// Code that uses obsolete API.
// ...

// Re-enable the warning.
#pragma warning restore SYSLIB0034

To suppress all the SYSLIB0034 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0034</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.