SYSLIB0016: GetContextInfo() is obsolete

The Graphics.GetContextInfo() method that takes no arguments is marked as obsolete, starting in .NET 6. Using it in code generates warning SYSLIB0016 at compile time.

For more information, see https://github.com/dotnet/runtime/issues/47880.

Workarounds

For better performance and fewer allocations, use the Graphics.GetContextInfo overloads that accept arguments:

• System.Drawing.Graphics.GetContextInfo(PointF)
• System.Drawing.Graphics.GetContextInfo(PointF, Region)

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 SYSLIB0016

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

// Re-enable the warning.
#pragma warning restore SYSLIB0016

To suppress all the SYSLIB0016 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0016</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.