C# configuration dependency-injection unity-container

使用配置文件进行 Unity 依赖注入 - 无法解析依赖关系

发布于 2024-09-30 03:04:30 字数 1767 浏览 1 评论 0原文

我正在使用我的 app.config 告诉 Unity 我的接口类型映射...

<unity>
<containers>
  <container>
    <types>
      <type type="UnityDAL.Interfaces.IDataContextFactory, UnityDAL"
         mapTo="UnityDAL.UnityDemoDataContextFactory, UnityDAL" />
      <type type="UnityDAL.Interfaces.IProductRepository, UnityDAL"
         mapTo="UnityDAL.ProductRepository, UnityDAL" />
      <type name="productRepo" 
         type="UnityDAL.Interfaces.IProductRepository, UnityDAL"
         mapTo="UnityDAL.ProductRepository, UnityDAL" />

   and so on...

使用此代码

var wrapper = UnityWrapper.Create();
var productRepository = 
    wrapper.Container.Resolve<IProductRepository>("productRepo");
var productsBO = new ProductBO(productRepository);
var products = productsBO.GetAllProducts();

这是包装器对象的构造函数...

public UnityWrapper()
{
    _container = new UnityContainer();
    var section = 
        (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
    section.Containers.Default.Configure(_container);
}

但我收到一个异常，上面写着...

{"Resolution of the dependency failed ，类型=“IProductRepository”，名称=“productRepo”。异常消息是：当前构建操作（构建密钥构建密钥[UnityDAL.ProductRepository，productRepo]）失败：尝试时无法解析参数 dataContextFactory 调用构造函数 UnityDAL.ProductRepository(UnityDAL.Interfaces. IDataContextFactory（数据上下文工厂）。（策略类型 Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy，索引 2)"}

我认为这个节点正在连接它

<type type="UnityDAL.Interfaces.IDataContextFactory, UnityDAL"
   mapTo="UnityDAL.UnityDemoDataContextFactory, UnityDAL" />

。这里的想法最初是创建一个很好的依赖链。知道我做错了什么吗？如果您有任何建议或提示我如何解决这个问题，我想听听他们的帮助，

干杯，

圣地亚哥。

原文

I'm using my app.config to tell Unity my interface to type mappings...

<unity>
<containers>
  <container>
    <types>
      <type type="UnityDAL.Interfaces.IDataContextFactory, UnityDAL"
         mapTo="UnityDAL.UnityDemoDataContextFactory, UnityDAL" />
      <type type="UnityDAL.Interfaces.IProductRepository, UnityDAL"
         mapTo="UnityDAL.ProductRepository, UnityDAL" />
      <type name="productRepo" 
         type="UnityDAL.Interfaces.IProductRepository, UnityDAL"
         mapTo="UnityDAL.ProductRepository, UnityDAL" />

   and so on...

using this code

var wrapper = UnityWrapper.Create();
var productRepository = 
    wrapper.Container.Resolve<IProductRepository>("productRepo");
var productsBO = new ProductBO(productRepository);
var products = productsBO.GetAllProducts();

Here is the constructor for the wrapper object...

public UnityWrapper()
{
    _container = new UnityContainer();
    var section = 
        (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
    section.Containers.Default.Configure(_container);
}

but I get an exception that says...

{"Resolution of the dependency failed, type = \"IProductRepository\",
name = \"productRepo\". Exception message is: The current build operation
(build key Build Key[UnityDAL.ProductRepository, productRepo]) failed:
The parameter dataContextFactory could not be resolved when attempting
to call constructor UnityDAL.ProductRepository(UnityDAL.Interfaces.
IDataContextFactory dataContextFactory). (Strategy type
Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy, index 2)"}

I thought this node was wiring that up

<type type="UnityDAL.Interfaces.IDataContextFactory, UnityDAL"
   mapTo="UnityDAL.UnityDemoDataContextFactory, UnityDAL" />

The idea here was originally to create a nice dependency chain. Any idea what I'm doing wrong? If you have any advice or tips on how I can correct the problem, I would like to hear them. Thanks for any help.

Cheers,

~ck in San Diego

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

森末i 2024-10-07 03:04:30

这是一个映射问题。

尝试解析UnityDAL.Interfaces.IProductRepository，您需要首先解析UnityDAL.Interfaces.IDataContextFactory。接下来尝试解析 UnityDAL.UnityDemoDataContextFactory 你会错过一些映射。可能 UnityDAL.UnityDemoDataContextFactory 的 ctor 需要尚未注册的东西。