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Application domains in .NET 6

jozefizso opened this issue · comments

commented

.NET Framework technologies unavailable on .NET

Several technologies available to .NET Framework libraries aren't available for use with .NET 6+, such as app domains, remoting, and code access security (CAS). If your libraries rely on one or more of the technologies listed on this page, consider the alternative approaches mentioned.

Application domains

Application domains (AppDomains) isolate apps from one another. AppDomains require runtime support and are resource-expensive. Creating more app domains isn't supported, and there are no plans to add this capability in the future. For code isolation, use separate processes or containers as an alternative. To dynamically load assemblies, use the AssemblyLoadContext class.

To make code migration from .NET Framework easier, .NET 6+ exposes some of the AppDomain API surface. Some of the APIs function normally (for example, AppDomain.UnhandledException), some members do nothing (for example, SetCachePath), and some of them throw PlatformNotSupportedException (for example, CreateDomain). Check the types you use against the System.AppDomain reference source in the dotnet/runtime GitHub repository. Make sure to select the branch that matches your implemented version.