1. Introduction Property injection is a form of dependency injection that allows the Unity container to automatically inject dependencies into properties of an object. With property injection, you can define the dependencies of a class using properties instead of constructor parameters. The Unity container takes care of resolving and injecting the dependencies into the properties at runtime.
2. Configuring Property Injection To enable property injection in Unity Container, you need to follow these steps:
Step 1: Register the types in the container using the appropriate registration methods such as RegisterType
or RegisterInstance
.
Step 2: Specify the properties to be injected using the Dependency
attribute.
3. Code Example Here's an example that demonstrates property injection in Unity Container:
csharpusing Unity;
using Unity.Injection;
public class MyService
{
[Dependency]
public ILogger Logger { get; set; }
public void DoSomething()
{
Logger.Log("Doing something...");
}
}
public interface ILogger
{
void Log(string message);
}
public class ConsoleLogger : ILogger
{
public void Log(string message)
{
Console.WriteLine(message);
}
}
class Program
{
static void Main(string[] args)
{
IUnityContainer container = new UnityContainer();
// Register types
container.RegisterType<ILogger, ConsoleLogger>();
// Resolve the object with property injection
var service = container.Resolve<MyService>();
// Use the object
service.DoSomething();
// Output: "Doing something..."
}
}
4. Explanation
In the above example, we have a MyService
class that depends on an ILogger
interface. Instead of passing the ILogger
dependency through the constructor, we use property injection by applying the [Dependency]
attribute to the Logger
property.
In the Main
method, we create an instance of the Unity container. Then we register the ILogger
interface to the ConsoleLogger
implementation using the RegisterType
method.
Next, we resolve an instance of MyService
from the container using the Resolve
method. The Unity container automatically resolves the dependency for the Logger
property and injects an instance of ConsoleLogger
into it.
Finally, we can use the MyService
object, and when we call the DoSomething
method, it uses the injected ILogger
instance to log the message.
By using property injection, we can easily configure and manage dependencies in our objects, allowing for more flexibility and decoupling of components in the application.
Conclusion Property injection in Unity Container provides a convenient way to inject dependencies into properties of objects. It simplifies the configuration and management of dependencies, promoting loose coupling and enhancing the flexibility of your application.
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