Question

我有点网核心项目，我想注入我的Controller IContextDb

我有很多类继承自IContextDb ie（ShopContext，UserContext，..）：IContextDb

我的问题是：

1 - 是否可以在正确的控制器中注入正确的上下文实时地在我的控制器中注入上下文

我的Startup.cs

public void ConfigureServices(IServiceCollection services)
{
  services.AddTransient<IContextDb>(
    serviceProvider => 
      {
         /// to do to map IContextDb with right context for
         /// right controller 
         /// or using reflection  
       });
    services.AddOptions();
    services.AddMvc();
  }

我的MVC控制器：

public class UserController
{
    private IContextDb _userContext
    public UserController(IContextDb userContext)
    {
       _userContext = userContext;
    }
}

坦克提前

Answer 1

只需在每个控制器中注入具体类

public class UserController
{
    private IContextDb _userContext
    public UserController(UserContext userContext)
    {
       _userContext = userContext;
    }
}

Answer 2

经过几天的研究后，我发现我可以注入所有课程

无需手动执行：使用装配和反射

<强> stratup.cs

<div class='container'>
  <div class='content'>
   <h1>Content</h1>
  </div>
  <div class='overlay'>
  </div>
</div>

/// 注册所有要注入的课程的功能

public void ConfigureServices(IServiceCollection services)
{
    /// I call the function register all class I want to be injected
    RegisterAllContext(services);
}

具有可注射属性的类

 public void RegisterAllContext(IServiceCollection services)
    {         
        // load assemblies
        var assemblies = AppDomain.CurrentDomain.GetAssemblies();

         // Get Dal assembly (class assembly want to be injected)
          var dalAssembly = assemblies.FirstOrDefault(assembly => assembly.GetName().Name == "DAL.UOF");

//registre all class with attribut inject 
// in the service to be injected.

    if (dalAssembly != null)
      {
         // Filter All assemblie type 
         // 1- by type is class 
         // 2- by type has CustomAttributes ("InjectableAttribute" in my case)


         var assemblieTypesNameContaintContext = from type in dalAssembly.GetTypes()
         where type.IsClass && type.CustomAttributes.Any(
                a =>{ return a.AttributeType == typeof(InjectableAttribute); })
         select type;

      // registre in net core injector service 
         foreach (var typeNameContaintContext in assemblieTypesNameContaintContext.ToList())
       {
          // get full Name assemblie type and
          // add it to the service.

            /// typeName == ClassFullName, assemblie Name
            /// Assemblie Name is necessary if the class
            /// in not int the same assemblie (assemblie name : "DAL.UOF" in my case)
            var typeName = typeNameContaintContext.FullName + ",DAL.UOF";
            var type = Type.GetType(typeName);
            if (type != null)
            {
                services.AddTransient(type, type);
            }
            else
            {
              Console.WriteLine("type is null");
            }
      }
}

Answer 3

要将DbContext添加到您的应用程序，请使用以下示例：

var connection = Configuration.GetConnectionString("DefaultDbConnection");
        services.AddDbContext<ShopContext>(options =>
            options.UseSqlServer(connection));

在您的控制器中

public class UserController
{
    private ShopContext_userContext
    public UserController(ShopContext userContext)
    {
       _userContext = userContext;
    }
}

您可以以这种方式注入manu上下文，或者只创建一个manu上下文，它将管理许多表。

net core 2.1依赖注入

3 个答案: