net10.0-windows7.0 
namespace System.IO
{
    public class StreamWriter : TextWriter
    {
        public StreamWriter(string! path, Encoding! encoding, FileStreamOptions! options);
    }
}
nuget.org
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Reference this API
.NET 6.07.08.09.010.0
Information specific to net10.0
Platforms This API is only available when you target a specific platform:
Windows 7.0
Information specific to net10.0-windows7.0
Assemblies

System.Runtime , Version=7.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

System.Runtime , Version=6.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

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

Package System.Runtime.Experimental (7.0.0-preview.2.22152.2) net7.0
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API