net6.0-windows 
namespace System.IO
{
    public class StreamReader : TextReader
    {
        public override int ReadBlock(Span<char> buffer);
    }
}
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Reference this API
.NET
5.06.07.08.09.010.0
.NET Core
2.12.23.03.1
.NET Standard
2.1
Information specific to net6.0
Assembly

System.Runtime , Version=6.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Runtime.Experimental.

Package System.Runtime.Experimental (6.0.2) net6.0
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API