Unity：具有多个构造函数的构造函数注入

发布于 2024-11-19 20:42:34 字数 962 浏览 4 评论 0原文

我正在尝试使用 Unity 构造函数注入来注入 EF ObjectContext。我的尝试是在引导程序中注册类型，如下所示：

protected override void ConfigureContainer()
{
    base.ConfigureContainer();
    Container.RegisterType<ObjectContext, MyObjectContext>(new InjectionConstructor());
}

EF 创建多个构造函数，如下所示

public MyObjectContext() : base("name=MyObjectContext", "MyObjectContext")
public MyObjectContext(string connectionString) : base(connectionString, "MyObjectContext")
public MyObjectContext(EntityConnection connection) : base(connection, "MyObjectContext")

在调试我的代码时，Unity 抛出一个 ResolutionFailedException 告诉我“MyObjectContext 类型有多个长度为 1 的构造函数。无法消除歧义。”当具有以下构造函数的新类被解析时。

public MainViewModel(UnityContainer container, MyObjectContext entities)

据我所知，使用 RegisterType 和 new InjectionConstructor() 作为参数可确保调用默认的无参数构造函数（这就是我想要的）。为什么 Unity 无法按预期解析类型？我错过了什么吗？

最好的问候

杰伊

原文

I'm trying to inject an EF ObjectContext using Unity constructor injection.
My attemp is to register the type in the bootsprapper like this:

protected override void ConfigureContainer()
{
    base.ConfigureContainer();
    Container.RegisterType<ObjectContext, MyObjectContext>(new InjectionConstructor());
}

EF creates mutiple constructors which look like these

public MyObjectContext() : base("name=MyObjectContext", "MyObjectContext")
public MyObjectContext(string connectionString) : base(connectionString, "MyObjectContext")
public MyObjectContext(EntityConnection connection) : base(connection, "MyObjectContext")

When debugging my code Unity throws a ResolutionFailedException telling me "The type MyObjectContext has multiple constructors of length 1. Unable to disambiguate." at the time when a new class that has the following constructor is resolved.

public MainViewModel(UnityContainer container, MyObjectContext entities)

As far as I know using RegisterType with new InjectionConstructor() as argument ensures that the default parameterless constructor is called (thats what I want). Why can't Unity resolve the type as expected? Do I miss anything?

Best Regards

Jay

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