.NET 9.0 ASP.NET Core Runtime9.0.22

Running an existing ASP.NET Core web or server application is the immediate job of .NET 9.0 ASP.NET Core Runtime. It supplies the execution environment required by compatible applications built with ASP.NET Core on .NET 9.0, allowing them to start when that runtime is not already available. This component supports application execution rather than providing a standalone environment for developing ASP.NET Core software.

Developers can use it when testing an application that depends on ASP.NET Core, while administrators and end users may encounter it when a compatible server application needs to launch. For web deployments, Microsoft recommends the Hosting Bundle, which combines the .NET Runtime with IIS support. The runtime therefore provides the application layer, while IIS can provide the supported web-server integration included with that bundle.

Microsoft publishes this Windows component as open-source software within Developer Tools. The current release is version 9.0.22, identified as the official ASP.NET Core Runtime for .NET 9.0. It is intended specifically for compatible ASP.NET Core applications, so its usefulness depends on the application being built for the corresponding runtime family.