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Why singleton hates scoped injection in .NET dependency injection
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Singleton, scoped and transient are the service lifetimes available when using dependency injection in .NET.
Most services can inject other services regardless of their lifetime. However, if you attempt to inject a scoped service into a singleton, you get a "Cannot consumed scoped service" error.
This can cause a problem if you're using Entity Framework for a database query in a service with a singleton lifetime, like a background service or SignalR.
We'll have a look at why this is and how we can use the IServiceProvider instance to create a custom scope so that we are able to use services that have a scoped lifetime.
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► More information:
► Chapters
0:00 Overview of the problem
0:24 Learn dependency injection with our online course
0:34 Service injection
1:44 Why can't a singleton inject a scoped?
2:14 When is this a problem?
2:50 Demo on the problem and how to resolve
5:18 Learn dependency injection with our online course
Most services can inject other services regardless of their lifetime. However, if you attempt to inject a scoped service into a singleton, you get a "Cannot consumed scoped service" error.
This can cause a problem if you're using Entity Framework for a database query in a service with a singleton lifetime, like a background service or SignalR.
We'll have a look at why this is and how we can use the IServiceProvider instance to create a custom scope so that we are able to use services that have a scoped lifetime.
📖 Learn .NET and C# with our online courses 📖
► More information:
► Chapters
0:00 Overview of the problem
0:24 Learn dependency injection with our online course
0:34 Service injection
1:44 Why can't a singleton inject a scoped?
2:14 When is this a problem?
2:50 Demo on the problem and how to resolve
5:18 Learn dependency injection with our online course
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