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A special tag that allows injection by name
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,109 @@ | ||
| #### Name tags | ||
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| [](../tests/Pure.DI.UsageTests/Advanced/NameTagsScenario.cs) | ||
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| Name tag are ordinary string tag in the special format: the full name of the type member and the name of the target element to be injected, separated by ":". For example for the _MyNamespace_ namespace and the type _Class1_: | ||
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| - `MyNamespace.Class1.Class1:state1 - the tag corresponds to the constructor argument named _state_ of type _MyNamespace.Class1_ | ||
| - `MyNamespace.Class1.DoSomething:myArg` - the tag corresponds to the _myArg_ argument of the _DoSomething_ method | ||
| - `MyNamespace.Class1.MyData` - the tag corresponds to property or field _MyData_ | ||
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| >For generic types, the type name also contains the number of type parameters, for example, for `IDictionary<TKey, TValue>` the type name would be `IDictionary`2`. For example, ```MyNamespace.Consumer`1.Consumer:myDep``` in this code: | ||
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| ```c# | ||
| interface IDependency; | ||
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| class AbcDependency : IDependency; | ||
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| class XyzDependency : IDependency; | ||
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| class Consumer<T>(IDependency myDep) | ||
| { | ||
| public IDependency Dependency { get; } = myDep; | ||
| } | ||
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| interface IService | ||
| { | ||
| IDependency Dependency1 { get; } | ||
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| IDependency Dependency2 { get; } | ||
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| IDependency Dependency3 { get; } | ||
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| IDependency Dependency4 { get; } | ||
| } | ||
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| class Service( | ||
| IDependency dependency1, | ||
| IDependency dependency2, | ||
| Consumer<string> consumer) | ||
| : IService | ||
| { | ||
| public IDependency Dependency1 { get; } = dependency1; | ||
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| public IDependency Dependency2 { get; } = dependency2; | ||
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| public required IDependency Dependency3 { init; get; } | ||
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| public IDependency Dependency4 => consumer.Dependency; | ||
| } | ||
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| DI.Setup(nameof(Composition)) | ||
| .Bind( | ||
| "MyNamespace.Service.Service:dependency1", | ||
| "MyNamespace.Consumer`1.Consumer:myDep") | ||
| .To<AbcDependency>() | ||
| .Bind("MyNamespace.Service.Service:dependency2", | ||
| "MyNamespace.Service:Dependency3") | ||
| .To<XyzDependency>() | ||
| .Bind().To<Consumer<TT>>() | ||
| .Bind<IService>().To<Service>() | ||
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| // Specifies to create the composition root named "Root" | ||
| .Root<IService>("Root"); | ||
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| var composition = new Composition(); | ||
| var service = composition.Root; | ||
| service.Dependency1.ShouldBeOfType<AbcDependency>(); | ||
| service.Dependency2.ShouldBeOfType<XyzDependency>(); | ||
| service.Dependency3.ShouldBeOfType<XyzDependency>(); | ||
| service.Dependency4.ShouldBeOfType<AbcDependency>(); | ||
| ``` | ||
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| >[!WARNING] | ||
| >Although this approach can be useful for specifying exactly what to inject, it can be more expensive to maintain, so it is recommended to use attributes like `[Tag(...)]`. | ||
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| Class diagram: | ||
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| ```mermaid | ||
| classDiagram | ||
| class Composition { | ||
| <<partial>> | ||
| +IService Root | ||
| } | ||
| AbcDependency --|> IDependency : "Pure.DI.UsageTests.Basics.NameTagsScenario.Service.Service:dependency1" | ||
| AbcDependency --|> IDependency | ||
| class AbcDependency { | ||
| +AbcDependency() | ||
| } | ||
| XyzDependency --|> IDependency : "Pure.DI.UsageTests.Basics.NameTagsScenario.Service.Service:dependency2" | ||
| class XyzDependency { | ||
| +XyzDependency() | ||
| } | ||
| Service --|> IService | ||
| class Service { | ||
| +Service(IDependency dependency1, IDependency dependency2, IDependency dependency3) | ||
| } | ||
| class IDependency { | ||
| <<interface>> | ||
| } | ||
| class IService { | ||
| <<interface>> | ||
| } | ||
| Composition ..> Service : IService Root | ||
| Service *-- "2 " AbcDependency : IDependency | ||
| Service o-- "Singleton" XyzDependency : IDependency | ||
| ``` | ||
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