Ninject级联构造函数参数

本文介绍了Ninject级联构造函数参数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个IRoleRepository类型，它接受一个构造函数参数数据库"，该类型接受一个IDbRepository类型，该IDbRepository本身接受一个构造函数参数"ConnectionStringName".我有一个具有GetService方法的依赖项解析器，并且在以下代码工作时，我希望使用Ninject 3.0与在Get时相比，在绑定时有更好的方法.注意我可能有多个IDBRepository实例，每个实例都有自己的"ConnectionStringName".

I have a type IRoleRepository which accepts a constructor argument "database" which accepts a type of IDbRepository which itself takes a constructor argument "ConnectionStringName". I have a dependency resolver which has a GetService method and while the following code works I was hoping there would be better way to do this at Bind time vs at Get time with Ninject 3.0. Note I may have multiple IDBRepository instances each with their own "ConnectionStringName".

_repository = EngineContext.Current.GetService<IRoleRepository>(
                        new ConstructorArgument("database",
                            EngineContext.Current.GetService<IDbRepository>(
                                new ConstructorArgument(SystemConstants.ConnectionStringName, SystemConstants.ConfigurationDatabase))));

推荐答案

好的，我相信我已经找到了想要的东西:

OK I believe I found what I wanted:

在绑定时间使用它:

            Bind<IDbRepository>().To<SqlServerRepository>()
            .WhenInjectedInto<IRoleRepository>()
            .WithConstructorArgument(SystemConstants.ConnectionStringName, SystemConstants.ConfigurationDatabase);

这使我可以在获取时间使用它:

This allows me to use this at Get time:

_repository = EngineContext.Current.GetService<IRoleRepository>();

这当然意味着我现在可以根据注入IDbRepository的更具体的存储库来更改IDbRepository的构造函数参数.例如:

This of course means I can now vary the constructor argument for IDbRepository based upon the more specific repository which the IDbRepository is being injected. eg:

            Bind<IDbRepository>().To<SqlServerRepository>()
            .WhenInjectedInto<ITimerJobStore>()
                .WithConstructorArgument(SystemConstants.ConnectionStringName, SystemConstants.ConfigurationDatabase);

        Bind<ITimerJobStore>().To<TimerJobSqlStore>();

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