使用简单注入器在静态类中进行属性注入

Question

I have used dependency injection from simple injector. Now I am trying to implement property injection but the help document is not helping much.

Can anyone explain with simple example how property injection work?

I want to use it in one Utility class of Web Project, not in controller. And that class method is static.

Answer 1

The documentation does not explain how to inject a static property because this is not supported in Simple Injector.

Static properties are typically a bad idea, because they hinder testability, cause Temporal Coupling , and can cause Captive Dependencies .

If a static property is required, you will have to inject the dependency yourself. You can do that in the Composition Root , right after you made all the registrations to the Container.

Example:

var container = new Container();

// Make registrations to container here:

container.Verify();

Utility.MyStaticProperty = container.GetInstance<IDependency>();

Under normal conditions, Simple Injector will detect these types of Lifestyle Mismatches , but it will not be able to do so when you inject this property yourself.