net10.0 
namespace System.Runtime.Serialization
{
    public delegate void SerializationEventHandler(StreamingContext context);
}
.NET
8.09.010.0
Information specific to net10.0
Assembly

System.Runtime.Serialization.Formatters , Version=10.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Runtime.Serialization.Formatters.

Package System.Runtime.Serialization.Formatters (10.0.1) net8.0
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API