Ninject and DbContext: How to Ensure Efficient Cleanup, Reduce Boilerplate, and Optimize Creation?

Questions about using Ninject

Context:

To manage dependencies in an MVC application, you implemented Ninject and injected DbContext in controllers' constructors. However, you have some concerns about the cleanup, flexibility, and efficiency of this setup.

Questions:

1. Cleanup and Disposal of DbContext:

   • Does Ninject ensure the timely disposal of the DbContext instance?

2. Reducing Boilerplate for Controller Initialization:

   • Is there a way to avoid the need to add DbContext as an argument to each controller's constructor, especially if you have a base class for common initialization?

3. Optimizing Creation of DbContext:

   • How efficient is creating an instance of DbContext, and is there a way to optimize it by creating it only when needed?

Answers:

1. Cleanup and Disposal:

   • Yes, Ninject takes care of disposing Disposable objects automatically as long as they are bound with a scope other than InTransientScope(). This ensures the timely cleanup and disposal of your DbContext instance.

2. Reducing Boilerplate:

   • Consolidate common functionality into filters rather than base classes. This allows you to apply cross-cutting concerns globally without requiring constructor injection in each controller.

3. Optimizing Creation:

   • The cost of creating a DbContext instance can vary depending on the context. However, there are strategies to minimize its impact:

     • Use dependency injection and avoid newing up instances manually.
     • Consider having a single instance of DbContext per request using interceptors or a custom action filter.
     • Optimize database queries to minimize the need to create new instances.

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