Asp.net mvc 实体框架、Unity和MVC

我有一个使用实体框架、MVC和Unity的多层应用程序。 基本设置如下所示：

EF数据访问层

public class MyDataProvider : DbContext, IMyDataProvider 
{


    public MyDataProvider(SqlConnection existingConnection, bool contextOwnsConnection)
        : base(existingConnection,contextOwnsConnection)
    {
        ((IObjectContextAdapter)this).ObjectContext.CommandTimeout = 60;

        Configuration.LazyLoadingEnabled = true;
        Configuration.ValidateOnSaveEnabled = true;
        Configuration.ProxyCreationEnabled = true;
        Configuration.AutoDetectChangesEnabled = true;

    }

    public new IDbSet<TModel> Set<TModel>() where TModel : class
    {
        return base.Set<TModel>();
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new EmployeeMapping());
        base.OnModelCreating(modelBuilder);
    }

public abstract class ServiceBase<TModel> : IDisposable, IService<TModel> where TModel : class, IModel
{
    [Dependency]
    public IMyDataProvider MyDataProvider { get; set; }
    ...
}

Global.asax

private static IUnityContainer InitContainer()
    {
        IUnityContainer unityContainer = new UnityContainer();
        Bootstrapper bootstrapper = new Bootstrapper(unityContainer);

        return unityContainer;
    }

我将UnityContainer的实例传递到Bootstrapper类中。引导程序类自注册所有程序集

在MVC控制器中，我注入了如下业务逻辑：

public class EmployeeController
{
    [Dependency("GetEmployees")]
    public IBusinessLogic GetEmployees_Operations { get; set; }

    public ActionResult EmployeeMain()
    {   
        var employees = GetEmployees_Operations.GetAllEmployees();
        ...
    }
}

在某种程度上，这一切都非常有效。每隔一段时间，我就会从MyDataProvider类中抛出一个异常：“EntityConnection只能用封闭的DbConnection构造”。这似乎发生在MVC站点的高使用率期间。异常非常简单，可以理解，但是我应该如何着手修复它呢

我发现，将实例化业务逻辑类的方式从控制器上的字段更改为ActionResult方法内部，我不会收到异常

例如：

public class EmployeeController
{
    //[Dependency("GetEmployees")]
    //public IBusinessLogic GetEmployees_Operations { get; set; }

    public ActionResult EmployeeMain()
    {   
        IBusinessLogic GetEmployees_Operations = _ioc_Bootstrapper.Resolve(typeof(IBusinessLogic), "GetEmployees") as IBusinessLogic;
        var employees = GetEmployees_Operations.GetAllEmployees();
        ...
    }
}

我是否完全错过了这条船，错误地实现了统一

引导程序代码

private void RegisterDAL(String assembly)
    {
        var currentAssembly = Assembly.LoadFrom(assembly);
        var assemblyTypes = currentAssembly.GetTypes();

        foreach (var assemblyType in assemblyTypes)
        {
            ...
            if (assemblyType.FullName.EndsWith("Provider"))
            {
                foreach (var requiredInterface in assemblyType.GetInterfaces())
                {
                    if (requiredInterface.FullName.EndsWith("DataProvider"))
                    {
                        var typeFrom = assemblyType.GetInterface(requiredInterface.Name);
                        var typeTo = assemblyType;
                        var injector = GetInjectorConstructor(assemblyType.Module.Name);
                        RegisterType(typeFrom, typeTo, false, injector);
                    }
                }

                continue;
            }

            ...
    }     

 private InjectionConstructor GetInjectorConstructor(String moduleName) 
 {
  ...
  connString = String.Concat("Data Source=MySqlServer, ";Initial Catalog=", catalogName, ";Application Name=", applicationName, ";Integrated Security=True; );
  var conn = new SqlConnection(connString);
  return new InjectionConstructor(conn, true);
  }

---

您的描述缺少（或我找不到）有关如何注册

SqlConnection

的信息。它发生在引导程序中。我在帖子中添加了代码。它不是向提供者的每个新实例注入了相同的连接吗？是的。这对于在事务中包含多个更新是必需的。Sql连接不应同时使用。如果你真的共享同一个连接，它可以解释你在重载下的问题。单个请求下的事务应在单个连接上处理。不同的请求应该使用不同的连接。

public class EmployeeController
{
    //[Dependency("GetEmployees")]
    //public IBusinessLogic GetEmployees_Operations { get; set; }

    public ActionResult EmployeeMain()
    {   
        IBusinessLogic GetEmployees_Operations = _ioc_Bootstrapper.Resolve(typeof(IBusinessLogic), "GetEmployees") as IBusinessLogic;
        var employees = GetEmployees_Operations.GetAllEmployees();
        ...
    }
}

private void RegisterDAL(String assembly)
    {
        var currentAssembly = Assembly.LoadFrom(assembly);
        var assemblyTypes = currentAssembly.GetTypes();

        foreach (var assemblyType in assemblyTypes)
        {
            ...
            if (assemblyType.FullName.EndsWith("Provider"))
            {
                foreach (var requiredInterface in assemblyType.GetInterfaces())
                {
                    if (requiredInterface.FullName.EndsWith("DataProvider"))
                    {
                        var typeFrom = assemblyType.GetInterface(requiredInterface.Name);
                        var typeTo = assemblyType;
                        var injector = GetInjectorConstructor(assemblyType.Module.Name);
                        RegisterType(typeFrom, typeTo, false, injector);
                    }
                }

                continue;
            }

            ...
    }     

 private InjectionConstructor GetInjectorConstructor(String moduleName) 
 {
  ...
  connString = String.Concat("Data Source=MySqlServer, ";Initial Catalog=", catalogName, ";Application Name=", applicationName, ";Integrated Security=True; );
  var conn = new SqlConnection(connString);
  return new InjectionConstructor(conn, true);
  }