将服务注入到AutoMapper目标类中 [英] Inject service into an AutoMapper destination class

问题描述

说我有一个使用AutoMapper映射的源类和目标类. 目的地将记录器服务注入到构造函数中.

Say I have a source and destination class that is mapped using AutoMapper. The destination has a logger service injected into the constructor.

但是，我不知道如何通过StructureMap将服务注入到构造函数中?

However, I don't know how to get the service injected into the constructor through StructureMap?

我尝试了以下操作:

Mapper.Initialize(m =>
 {                
    m.ConstructServicesUsing(ObjectFactory.GetInstance);
 });

这并不能阻止我在映射调用中出现异常，我想是因为该服务未正确注入.

which didn't prevent me having the exception on the mapping call, I guess because the service isn't being injected in properly.

我还尝试了以下方法:

CreateMap<Source, Dest>()
 .ConstructUsing(x=> ObjectFactory.GetInstance<ILoggerService>());

但是我得到了一个错误:无法将Lamda表达式转换为委托类型，但是我看到的所有示例都使用此方法吗?

But I get the error: cannot convert Lamda expression to delegate type, yet all the examples I have seen use this method?

推荐答案

您传递给ConstructUsing的lambda必须返回目标类型的实例.因此，就您而言，您想这样做:

The lambda you pass into ConstructUsing must return an instance of the destination type. So in your case, you would want to do this:

CreateMap<Source, Dest>()  
.ConstructUsing(x=> ObjectFactory.GetInstance<Dest>());

假设您正确设置了StructureMap，它将创建Dest对象并为您注入ILoggerService.

Assuming you have StructureMap setup correctly, it should create the Dest object and inject the ILoggerService for you.

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