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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