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- Default constructor arguments can be used for simple values
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- The DI container will use these defaults if no explicit bindings are provided
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This example illustrates how to handle default values in a dependency injection scenario:
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-**Constructor Default Argument**: The `Service` class has a constructor with a default value for the name parameter. If no value is provided, “My Service” will be used.
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-**Required Property with Default**: The Dependency property is marked as required but has a default instantiation. This ensures that:
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- The property must be set
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- If no explicit injection occurs, a default value will be used
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## Required properties or fields
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All properties or fieldsmarked with the _required_ keyword automatically become injected dependencies.
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This example demonstrates how the `required` modifier can be used to automatically inject dependencies into properties and fields. When a property or field is marked with `required`, the DI will automatically inject the dependency without additional effort.
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```c#
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usingShouldly;
@@ -1401,6 +1429,7 @@ To run the above code, the following NuGet packages must be added:
This approach simplifies dependency injection by eliminating the need to manually configure bindings for required dependencies, making the code more concise and easier to maintain.
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## Overrides
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@@ -7450,7 +7479,7 @@ internal partial class Composition
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// Models
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.Bind().To<Log<TT>>()
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.Bind().As(Singleton).To<Clock.Models.Timer>()
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.Bind().As(Singleton).To<Timer>()
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.Bind().As(PerBlock).To<SystemClock>()
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// Infrastructure
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You can use a combined attribute, and each method in the list above has an optional parameter that defines the argument number (the default is 0) from where to get the appropriate metadata for _tag_, _ordinal_, or _type_.
Interception is the ability to intercept calls between objects in order to enrich or change their behavior, but without having to change their code. A prerequisite for interception is weak binding. That is, if programming is abstraction-based, the underlying implementation can be transformed or improved by "packaging" it into other implementations of the same abstraction. At its core, intercept is an application of the Decorator design pattern. This pattern provides a flexible alternative to inheritance by dynamically "attaching" additional responsibility to an object. Decorator "packs" one implementation of an abstraction into another implementation of the same abstraction like a "matryoshka doll".
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