Question

我正在尝试注册具有IDbConnection作为构造函数参数的存储库类。

public class Repository<TEntity> : IRepositoryAsync<TEntity> where TEntity : class
{
    public Repository(IDbConnection connection)
    {
        Connection = connection;
    }

    public IDbConnection Connection { get; }
}

我注册了类似的东西

var container = new Container();
container.Options.DefaultScopedLifestyle = new WcfOperationLifestyle();
container.Register(typeof(IRepositoryAsync<>), typeof(Repository<>));
container.Register(typeof(IDbConnection), typeof(Repository<User>));
    container.Register<IAuthService, AuthService>();
container.Verify();

我的代码出了什么问题？

更新我得到如下的例外

Repository类型的构造函数包含带名称的参数 'connection'并键入未注册的IDbConnection。请确保注册IDbConnection，或更改构造函数库中。

更新2

[ArgumentException：提供的类型Repository未实现   IDbConnection.Parameter name：implementationType]
  SimpleInjector.Requires.ThrowSuppliedTypeDoesNotInheritFromOrImplement（类型   service，Type implementation，String paramName）+63
  SimpleInjector.Requires.ServiceIsAssignableFromImplementation（类型   service，Type implementation，String paramName）+47
  SimpleInjector.Container.Register（输入serviceType，Type   implementationType，Lifestyle生活方式，String serviceTypeParamName，   String implementationTypeParamName）+159
  SimpleInjector.Container.Register（输入serviceType，Type   implementationType）+52
  TimeTrackerService.Service.DependencyConfig..cctor（）in   d：\时间跟踪\ TimeTrackerService \库\ TimeTrackerService.Service \ DependencyConfig.cs：47 [TypeInitializationException：   'TimeTrackerService.Service.DependencyConfig'的类型初始值设定项   抛出异常。]
  TimeTrackerService.Service.DependencyConfig.get_Container（）in   d：\时间跟踪\ TimeTrackerService \库\ TimeTrackerService.Service \ DependencyConfig.cs：40   TimeTrackerService.WcfServiceFactory.CreateServiceHost（类型   serviceType，Uri [] baseAddresses）in   d：\时间跟踪\ TimeTrackerService \ TimeTrackerService \ WcfServiceFactory.cs：15   System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost（字符串   constructorString，Uri [] baseAddresses）+524
  System.ServiceModel.HostingManager.CreateService（字符串   normalizedVirtualPath，EventTraceActivity eventTraceActivity）+1420
  System.ServiceModel.HostingManager.ActivateService（ServiceActivationInfo   serviceActivationInfo，EventTraceActivity eventTraceActivity）+52
  System.ServiceModel.HostingManager.EnsureServiceAvailable（字符串   normalizedVirtualPath，EventTraceActivity eventTraceActivity）   +641 [ServiceActivationException：由于编译期间发生异常，无法激活服务'/TrackerService.svc'。该   异常消息是：类型初始化器   'TimeTrackerService.Service.DependencyConfig'抛出异常..]
  System.Runtime.AsyncResult.End（IAsyncResult result）+489035
  System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End（IAsyncResult的   结果）+174
  System.ServiceModel.Activation.ServiceHttpModule.EndProcessRequest（IAsyncResult的   ar）+350322
  System.Web.AsyncEventExecutionStep.OnAsyncEventCompletion（IAsyncResult的   ar）+9747521

Answer 1

最后我提出了解决方案。而不是注入IDbConnection我注入自己的接口与实现。 IDataFactory和DataFactory。此实现返回IDbConnection

private readonly string _providerName;
private readonly DbProviderFactory _provider;
public string ConnectionString { get; set; }

public DataFactory()
{
    var con = ConfigurationManager.ConnectionStrings["TrackerConnection"];
    if (con == null)
        throw new Exception("Failed to find connection");
    ConnectionString = con.ConnectionString;
    _providerName = con.ProviderName;
    _provider = DbProviderFactories.GetFactory(con.ProviderName);
}
public IDbConnection Connection
{
    get
    {
        var connection = _provider.CreateConnection();
        if (connection == null)
            throw new Exception($"Failed to create a connection using the connection string named '{_providerName}' in app.config or web.config.");
        connection.ConnectionString = ConnectionString;
        return connection;
    }
}

然后我注册了

container.Register<IDataFactory, DataFactory>();

现在我注入我的实现

public class Repository<TEntity> : IRepositoryAsync<TEntity> where TEntity : class
{
    public Repository(IDataFactory factory)
    {
        Factory= factory;
    }

    public IDataFactory Factory{ get; }
}

现在，当我使用Factory.Connection时，它按预期工作

感谢

Answer 2

另一种方式，避免添加自己的界面和实现将此覆盖用于Register方法：
Container.Register<TService>(Func<TService> instanceCreator, Lifestyle lifestyle)

这样的事情：

container.Register<IDbConnection>(() =>{ 
    var con = ConfigurationManager.ConnectionStrings["TrackerConnection"]; 
    if (con == null) 
        throw new Exception("Failed to find connection"); 

    var _provider = DbProviderFactories.GetFactory(con.ProviderName); 

    var connection = _provider.CreateConnection(); 
    if (connection == null) 
        throw new Exception($"Failed to create a connection using the connection string named '{con.ProviderName}' in app.config or web.config."); 

    connection.ConnectionString = con.ConnectionString; 
    return connection; 
});

带参数

2 个答案: