System.Speech not working on deployment

Brian Campbell 6 Reputation points

I am using .NET 6 for a Desktop application under Windows 10 and have installed the System.Speech NuGet package. I am using the System.Speech.Synthesis library. It works fine within the Visual Studio IDE (compiled for Debug and Release) but as soon as I created an installer using the Microsoft Setup extension and install the program on exactly the same machine as running the IDE, I get an Exception: -

System.PlatformNotSupportedException: Speech is not supported on this platform.

Under the IDE, everything works fine - no crashes and I can hear the speech. Stand-alone the application causes an exception on creating an instance of the System.Speech.Synthesis.SpeechSynthesizer object.

Because it works fine under the IDE, I can't use it to do any pinpointing of the problem.

I have repeated this on three totally different computers all with the same results. It does not appear to be a configuration issue with one machine.

.NET Runtime
.NET Runtime
.NET: Microsoft Technologies based on the .NET software framework.Runtime: An environment required to run apps that aren't compiled to machine language.
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