net11.0 
namespace System.Speech.Synthesis
{
    public abstract class PromptEventArgs : AsyncCompletedEventArgs
    {
        public Prompt Prompt { get; }
    }
}
nuget.org
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Reference this API
.NET
8.09.010.011.0
.NET Framework
3.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net11.0
Assemblies

System.Speech , Version=10.0.0.5, PublicKeyToken=31bf3856ad364e35

System.Speech , Version=11.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to System.Speech.

Package System.Speech (10.0.5) net10.0
Platform Restrictions

The property getter is only supported on the following platforms:

  • Windows
  • Built-in API
  • Package-provided API