C# 如何使用 Ioc Unity 注入依赖属性
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How to inject dependency property using Ioc Unity
提问by Jin Ho
I have the following classes:
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() ";
}
}
I use Unity for IoC, my registration looks like this:
我使用 Unity 进行 IoC，我的注册看起来像这样：
container.RegisterType<IServiceA, ServiceA>();
container.RegisterType<IServiceB, ServiceB>();
When I resolve a ServiceAinstance, serviceBwill be null.
How can I resolve this?
当我解析一个ServiceA实例时，serviceB将是null. 我该如何解决这个问题？
采纳答案by nemesv
You have at least two options here:
您在这里至少有两个选择：
You can/should use constructor injection, for that you need a constructor:
您可以/应该使用构造函数注入，因为您需要一个构造函数：
public class ServiceA : IServiceA
{
private IServiceB serviceB;
public ServiceA(IServiceB serviceB)
{
this.serviceB = serviceB;
}
public string MethodA1()
{
return "MethodA1() " +serviceB.MethodB1();
}
}
Or Unity supports property injection, for that you need a property and the DependencyAttribute:
或者 Unity 支持属性注入，为此您需要一个属性和DependencyAttribute：
public class ServiceA : IServiceA
{
[Dependency]
public IServiceB ServiceB { get; set; };
public string MethodA1()
{
return "MethodA1() " +serviceB.MethodB1();
}
}
The MSDN site What Does Unity Do?is a good starting point for Unity.
MSDN 站点Unity 做什么？是 Unity 的一个很好的起点。
