autofac - 錯誤的鍵控服務正在解決中

Question

我使用autofac並嘗試pick a service implementation by context。基本思想是有兩個存儲庫 - 一個連接到數據庫Db1，另一個連接到數據庫Db2。我試圖使用鍵控服務來指示需要哪個數據庫連接。

下面的代碼：

public class Db1Repository(IDbConnection dbConnection) 
{ 
    // ... 
} 

public class Db2Repository(IDbConnection dbConnection) 
{ 
    // ... 
} 

public class ClassThatDoesSomethingSpecial(Db1Repository repository) 
{ 
    // ... 
} 

var builder = new ContainerBuilder(); 

builder.RegisterType<SqlConnection>() 
     .WithParameter("connectionString",ConfigurationManager.ConnectionStrings["Db1"].ConnectionString) 
     .As<IDbConnection>() 
     .Keyed<IDbConnection>("Db1"); 

builder.RegisterType<SqlConnection>() 
     .As<IDbConnection>() 
     .WithParameter("connectionString", ConfigurationManager.ConnectionStrings["Db2"].ConnectionString) 
     .Keyed<IDbConnection>("Db2"); 

builder.RegisterType<Db1Repository>() 
     .WithParameter(
      new ResolvedParameter(
       (pi, ctx) => pi.ParameterType == typeof(IDbConnection), 
       (pi, ctx) => ctx.ResolveKeyed<IDbConnection>("Db1") 
      ) 
     ); 

builder.RegisterType<ClassThatDoesSomethingSpecial>(); 

var container = builder.Build(); 

var myclass = container.Resolve<ClassThatDoesSomethingSpecial>(); 

應該發生什麼： 被注入的ClassThatDoesSomethingSpecial構造函數的Db1Repository應該有一個IDbConnection這是解析爲SqlConnection到DB1。

相反，IDbConnection解析爲SqlConnection至Db2！

我在做什麼錯？

Answer 1

試試這個：

builder 
    .RegisterType<Db1Repository>() 
    .WithParameter(ResolvedParameter.ForNamed<IDbConnection>("Db1")); 

https://autofac.org/apidoc/html/CF9E2168.htm