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SYSLIB0012: Assembly.CodeBase and Assembly.EscapedCodeBase are obsolete

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The following APIs are marked as obsolete, starting in .NET 5. Using them in code generates warning SYSLIB0012 at compile time.

Workarounds

Use Assembly.Location instead.

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 SYSLIB0012

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

// Re-enable the warning.
#pragma warning restore SYSLIB0012

To suppress all the SYSLIB0012 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0012</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.

See also