xamarinios 
namespace System.IO
{
    public class FileSystemWatcher : IDisposable
    {
        public void Dispose();
    }
}
nuget.org
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 1.01.12.02.12.23.03.1
.NET Framework 4.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 1.31.41.51.62.02.1
Information specific to xamarinios
Assembly

System.IO.FileSystem.Watcher , Version=4.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.IO.FileSystem.Watcher.

Package System.IO.FileSystem.Watcher (4.3.0) netstandard1.3
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API