變化與統一

構造注入字符串參數

我的目標是改變一個字符串參數：變化與統一

Container 
.RegisterInstance<string>("us", @"\\ad1\accounting$\Xml\qb_us.xml") 
.RegisterInstance<string>("intl", @"\\ad1\accounting$\Xml\qb_intl.xml"); 

driver = Container.Resolve<LoaderDriver>(args[1]); // "us" or "intl"

導致：

Resolution of the dependency failed, type = "QuickBooksService.LoaderDriver", name = "intl". 
Exception occurred while: while resolving. 
Exception is: InvalidOperationException - The type String cannot be constructed. You must configure the container to supply this value. 
----------------------------------------------- 
At the time of the exception, the container was: 

    Resolving QuickBooksService.LoaderDriver,intl 
    Resolving parameter "reader" of constructor QuickBooksService.LoaderDriver(QuickBooksService.LoaderInputReader reader, QuickBooksService.ILoader[] loaders) 
    Resolving QuickBooksService.LoaderInputReader,(none) 
    Resolving parameter "inputFile" of constructor QuickBooksService.LoaderInputReader(System.String inputFile, AccountingBackupWeb.Models.AccountingBackup.Company company, Qu 
ickBooksService.eTargets targets) 
     Resolving System.String,(none)

這顯然是錯誤的，但它的唯一途徑我能得到它的工作：

if (args[1] == "us") 
    Container 
     .RegisterType<LoaderInputReader>(
      new InjectionConstructor(
       @"\\ad1\accounting$\Xml\qb_us.xml", 
       new ResolvedParameter<Company>(), 
       new ResolvedParameter<eTargets>() 
      ) 
     ) 
    ; 
else if (args[1] == "intl") 
    Container 
     .RegisterType<LoaderInputReader>(
      new InjectionConstructor(
       @"\\ad1\accounting$\Xml\qb_intl.xml", 
       new ResolvedParameter<Company>(), 
       new ResolvedParameter<eTargets>() 
      ) 
     ) 
    ; 
else 
    throw new Exception("invalid company"); 

driver = Container.Resolve<LoaderDriver>();

來源

2011-11-18 Aaron Anodide

像這樣的東西應該工作：

container 
    .RegisterType<LoaderInputReader>(
     "us", 
     new InjectionConstructor(
      @"\\ad1\accounting$\Xml\qb_us.xml", 
      new ResolvedParameter<Company>(), 
      new ResolvedParameter<eTargets>())); 
container 
    .RegisterType<LoaderInputReader>(
     "intl", 
     new InjectionConstructor(
      @"\\ad1\accounting$\Xml\qb_intl.xml", 
      new ResolvedParameter<Company>(), 
      new ResolvedParameter<eTargets>()));

這名LoaderInputReader每個註冊。現在，你可以解決這樣的：

var us = container.Resolve<LoaderInputReader>("us"); 
var intl = container.Resolve<LoaderInputReader>("intl");

來源

2011-11-18 20:43:28

您可以簡化這一點了，說：container.RegisterType （「我們」，新InjectionConstructor（字符串的typeof（公司）的typeof（eTargets））;你只需要明確地使用ResolvedParameter，如果你正在解決一個命名的依賴關係。 –

謝謝你們真的幫助我走出了noob區域 –

也許你可以改變

driver = Container.Resolve<LoaderDriver>(args[1]); // "us" or "intl"

與

driver = Container.Resolve<LoaderDriver>(Container.Resolve<string>(args[1]))

這需要的Resolve overload that takes a name，凡在你的情況下，名字來源於你的論點的優勢。

來源

2011-11-18 19:54:50 Kit

回答

相關問題