使用 Microsoft Unity IOC，如何将现有对象传递给它来注入？

发布于 2024-11-04 07:25:37 字数 316 浏览 1 评论 0原文

所以如果我有：

public class CustomerViewModel
{
    public CustomerViewModel(ICustomer customer)
    {
        this.customer = customer
    }
}

那么有没有办法实现：

ICustomerViewModel customerViewModel = container.Resolve<ICustomerViewModel>(existingCustomer);

原文

So if I have:

public class CustomerViewModel
{
    public CustomerViewModel(ICustomer customer)
    {
        this.customer = customer
    }
}

then is there a way to achieve:

ICustomerViewModel customerViewModel = container.Resolve<ICustomerViewModel>(existingCustomer);

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长不大的小祸害 2024-11-11 07:25:38

如果你想通过属性和方法注入来构建一个现有的实例，你可以使用以下方法：

var model = new CustomerViewModel(customer);
model = container.BuildUp(model);

一般来说我不建议使用Unity的这个功能。有时您需要它，但它通常是一个警告信号，可以通过稍微调整设计来修复，以便更自然地使用 IoC 作为模式（而不是框架）。有了有关如何使用它的更多详细信息，SO 社区可能可以提供一些其他选项......

If you want to build-up an existing instance through property and method injection, you can use the following:

var model = new CustomerViewModel(customer);
model = container.BuildUp(model);

In general I would not recommend using this feature of Unity. Sometimes you need it, but it's usually a warning sign that could be fixed by adjusting the design a bit to work more naturally with IoC as a pattern (not a framework). With more details on how you are using it, the SO community can probably offer some other options...

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不可一世的女人 2024-11-11 07:25:38

由于依赖项注入容器旨在提供完成的对象，因此您需要使用工厂模式（在这些情况下很常见）来实现所需的配置：

public interface ICustomerViewModelFactory {
   public ICustomerViewModel GetModelFor(ICustomer customer);
}

public class CustomerViewModelFactory : ICustomerViewModelFactory {
   public ICustomerViewModel GetModelFor(ICustomer customer) {
      return new CustomerViewModel(customer);
   }
}

// elsewhere...
container.RegisterInstance<ICustomerViewModelFactory>(new CustomerViewModelFactory());

// and finally...
ICustomerViewModelFactory factory = container.Resolve<ICustomerViewModelFactory>();
ICustomerViewModel customerViewModel = factory.GetModelFor(existingCustomer);

Since the dependency injection container is designed to provide finished objects, you'll need to use a factory pattern (which is quite common in these cases) to achieve your desired configuration:

public interface ICustomerViewModelFactory {
   public ICustomerViewModel GetModelFor(ICustomer customer);
}

public class CustomerViewModelFactory : ICustomerViewModelFactory {
   public ICustomerViewModel GetModelFor(ICustomer customer) {
      return new CustomerViewModel(customer);
   }
}

// elsewhere...
container.RegisterInstance<ICustomerViewModelFactory>(new CustomerViewModelFactory());

// and finally...
ICustomerViewModelFactory factory = container.Resolve<ICustomerViewModelFactory>();
ICustomerViewModel customerViewModel = factory.GetModelFor(existingCustomer);

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