本文介绍了如何使用Ninject绑定与所需的连接字符串类的构造函数?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

如何使用Ninject绑定所需的连接字符串类的构造函数?

How to bind classes with required connection string in constructor using Ninject?

下面是我使用的类:

AppService服务类:

using SomeProject.LayerB;

namespace SomeProject.LayerA;
{
    public class AppService
    {
        private readonly ISomeRepository someRepository;

        public LocationManagementService(ISomeRepository someRepository)
        {
            this.someRepository = someRepository;
        }

        // other codes ...
    }
}

SomeRepository 类:

namespace SomeProject.LayerB;
{
    public class SomeRepository : ISomeRepository
    {
        private readonly SomeDbContext context;

        public SomeRepository(SomeDbContext context)
        {
            this.context = context;
        }

        // other codes ...
    }
}

SomeDbContext 类:

namespace SomeProject.LayerB;
{
    public class SomeDbContext : DbContext
    {
        public SomeDbContext(string nameOrConnectionString)
            : base(nameOrConnectionString)
        {
        }

        // other codes ...
    }
}

然后,我用的 Ninject模块包含以下代码:

Then, I use a Ninject module containing the following code:

namespace SomeProject.LayerC;
{
    public class SomeModule : NinjectModule
    {
        public override void Load()
        {
            Bind<ISomeRepository>().To<SomeRepository>();

            // My problem is on this part.. I want to provide the connection string on the
            // main program, not here on this class.
            // Bind<SomeDbContext>().ToSelf().WithConstructorArgument("nameOrConnectionString", "the connection string I want to inject");
        }
    }
}

主要节目

using SomeProject.LayerA;
using SomeProject.LayerC;

namespace SomeProject.LayerD;
{
    public class MainProgram
    {
        public MainProgram()
        {
            IKernel kernel = new StandardKernel(new SomeModule());

            AppService appService = kernel.Get<AppService>();
        }
    }
}

注意:该主程序可以参考的唯一层是层1.在这里AppService服务类定位和以及LayerC其中ninject模块中找到。

NOTE: The only layer that main program can reference is LayerA where AppService class is located and as well as LayerC where the ninject module is found.

推荐答案

添加配置类是这样的:

public class Config
{
    public static string ConnectionString { get; set; }
}

和你ninject模块写的:

and in your ninject module write this:

Bind<SomeDbContext>().ToSelf()
   .WithConstructorArgument("nameOrConnectionString",
       c => Config.ConnectionString);



然后在你的主要方法,你可以写如下:

then in your main method you could write following:

public class MainProgram
{
    public MainProgram()
    {
        IKernel kernel = new StandardKernel(new SomeModule());
        Config.ConnectionString = "The connection string";
        AppService appService = kernel.Get<AppService>();
    }
}



更新:

您可以使用 ninject 找到配置类,如果你还不想用静态方法:

You can use ninject to locate config class also if you don't want use static methods:

class Config2
{
    public string ConnectionString { get; set; }
}

在模块:

Bind<Config2>().ToSelf().InSingletonScope();
Bind<SomeDbContext>().ToSelf()
   .WithConstructorArgument("nameOrConnectionString",
       c=>c.Kernel.Get<Config2>().ConnectionString);

在主:

IKernel kernel = new StandardKernel(new SomeModule());
var conf = kernel.Get<Config2>();
conf.ConnectionString = "The connection string";
AppService appService = kernel.Get<AppService>();

这篇关于如何使用Ninject绑定与所需的连接字符串类的构造函数?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

09-05 21:22