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SYSLIB0010: Unsupported remoting APIs

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.NET remoting is a legacy technology, and the infrastructure exists only in .NET Framework. The following remoting-related APIs are marked as obsolete, starting in .NET 5. Using them in code generates warning SYSLIB0010 at compile time and throws a PlatformNotSupportedException at run time.

Workarounds

Consider using WCF or HTTP-based REST services to communicate with objects in other applications or across machines. For more information, see .NET Framework technologies unavailable on .NET Core.

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 SYSLIB0010

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

// Re-enable the warning.
#pragma warning restore SYSLIB0010

To suppress all the SYSLIB0010 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0010</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.

See also