多个构造函数与 Structuremap 改变范围?

发布于 2024-08-23 03:57:33 字数 1563 浏览 9 评论 0原文

为了说明问题,这是我的设置的简化版本。 我有一个像这样的工厂:

public interface IFactory{ }

public class Factory : IFactory
{
    public Factory()
    {
        Console.WriteLine("parameterless");
    }

    //public Factory(int i)
    //{
    //    Console.WriteLine("with parameter : {0}", i);
    //}

}

测试它的程序是一个consoleApp。足以证明我的观点。

static void Main(string[] args)
{
     Init();
     var factory1 = ObjectFactory.GetInstance<IFactory>();
     var factory2 = ObjectFactory.GetInstance<IFactory>();
     var factory3 = ObjectFactory.GetInstance<IFactory>();
     Console.Read();
 }

我在 Init 静态方法中设置 structureMap 。

  public static void Init()
        {
            ObjectFactory.Initialize(x =>
            {
                 //insert Initialization code here.
            });
        }

如果我只有一个构造函数并像这样设置 StructureMap :

x.For<IFactory>().Use<Factory>();

效果很好,并且输出显示
无参数
无参数
无参数

每次调用都会构建一个新实例。

现在,如果我取消注释第二个构造函数,但我想使用无参数构造函数,并具有相同的默认生活方式。我该怎么办?

我尝试过:

x.SelectConstructor<IFactory>(() => new Factory());
x.For<IFactory>().Use<Factory>();

它只是不起作用:缺少 InstanceKey 的请求实例属性“i”

如果我这样做:

 x.For<IFactory>().Use(new Factory());

它可以工作,但输出只是一个“无参数”,这意味着它不会为每次调用构建一个新实例。它使用我传入的这个特定实例。

我发现的唯一方法是在无参数构造函数顶部添加 [DefaultConstructor] 并使用标准 x.For().Use(); 但我不想添加此属性并将配置分布到我的模型中。

帮助?

To illustrate the problem, here is a simplified version of my setup.
I have a factory like this one :

public interface IFactory{ }

public class Factory : IFactory
{
    public Factory()
    {
        Console.WriteLine("parameterless");
    }

    //public Factory(int i)
    //{
    //    Console.WriteLine("with parameter : {0}", i);
    //}

}

the program to test this is a consoleApp. Enough to prove my point.

static void Main(string[] args)
{
     Init();
     var factory1 = ObjectFactory.GetInstance<IFactory>();
     var factory2 = ObjectFactory.GetInstance<IFactory>();
     var factory3 = ObjectFactory.GetInstance<IFactory>();
     Console.Read();
 }

I setup strucutreMap in my Init static method.

  public static void Init()
        {
            ObjectFactory.Initialize(x =>
            {
                 //insert Initialization code here.
            });
        }

If I have only one constructor and setup StructureMap like this :

x.For<IFactory>().Use<Factory>();

that works perfect, and the output shows
parameterless
parameterless
parameterless

Each call builds a new instance.

Now if I uncomment the second constructor, but I want to use the parameterless one, and with the same default lifestyle. How would I do?

I tried that :

x.SelectConstructor<IFactory>(() => new Factory());
x.For<IFactory>().Use<Factory>();

It just doesn't work : Missing requested Instance property "i" for InstanceKey

If I do like this :

 x.For<IFactory>().Use(new Factory());

It works, but the output is just one "parameterless" meaning it's not building a new instance for each call. It's using this specific instance I pass in.

The only way I found is to add the [DefaultConstructor] on top of my parameterless constructor and use the standard x.For().Use();
But I don't want to add this attribute and spread the configuration accross my model.

Help?

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评论(1

一梦等七年七年为一梦 2024-08-30 03:57:33

SelectConstructor 采用具体类型,而不是接口。当然,接口没有任何构造函数。
但没有任何问题,它只是被忽略了......所以我无法发现该错误。

 x.SelectConstructor<IFactory>(() => new Factory());
 x.For<IFactory>().Use<Factory>();

应该是

 x.SelectConstructor<**Factory**>(() => new Factory());
 x.For<IFactory>().Use<Factory>();

SelectConstructor takes the concrete type, not the interface. Of course, an interface doesnt have any constructor.
But nothing breaks, it's just ignored.... so I couldnt spot that error.

 x.SelectConstructor<IFactory>(() => new Factory());
 x.For<IFactory>().Use<Factory>();

should be

 x.SelectConstructor<**Factory**>(() => new Factory());
 x.For<IFactory>().Use<Factory>();
~没有更多了~
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