如何使用Ioc Unity注入依赖项属性 [英] How to inject dependency property using Ioc Unity

问题描述

我有以下课程:

public interface IServiceA
{
    string MethodA1();
}

public interface IServiceB
{
    string MethodB1();
}

public class ServiceA : IServiceA
{
    public IServiceB serviceB;

    public string MethodA1()
    {
        return "MethodA1() " +serviceB.MethodB1();
    }
}

public class ServiceB : IServiceB
{
    public string MethodB1()
    {
        return "MethodB1() ";
    }
}

我使用Unity for IoC，我的注册如下:

I use Unity for IoC, my registration looks like this:

container.RegisterType<IServiceA, ServiceA>(); 
container.RegisterType<IServiceB, ServiceB>(); 

当我解析ServiceA实例时，serviceB将是null. 我该如何解决?

When I resolve a ServiceA instance, serviceB will be null. How can I resolve this?

推荐答案

您在这里至少有两个选择:

You have at least two options here:

您可以/应该使用构造函数注入，因为您需要构造函数:

You can/should use constructor injection, for that you need a constructor:

public class ServiceA : IServiceA
{
    private IServiceB serviceB;

    public ServiceA(IServiceB serviceB)
    {
        this.serviceB = serviceB;
    }

    public string MethodA1()
    {
        return "MethodA1() " +serviceB.MethodB1();
    }
}

或者Unity支持属性注入，为此您需要一个属性和DependencyAttribute:

Or Unity supports property injection, for that you need a property and the DependencyAttribute:

public class ServiceA : IServiceA
{
    [Dependency]
    public IServiceB ServiceB { get; set; };

    public string MethodA1()
    {
        return "MethodA1() " +serviceB.MethodB1();
    }
}

MSDN网站 Unity做什么?是一个很好的Unity起点.

The MSDN site What Does Unity Do? is a good starting point for Unity.

这篇关于如何使用Ioc Unity注入依赖项属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！