通用存储库和通用 DbContext 中没有隐式引用转换错误

Question

我在我的程序中使用了通用存储库，但是当我将上下文描述为通用上下文时，它会导致错误：

错误 1 ​​类型 'ArchiveBoundedContext.Infrastructure.Contexts.ArchiveBoundedContext' 不能用作类型参数 'TContext' 在泛型类型或 方法 'SharedKernel.Infrastructure.Repository'。 没有来自的隐式引用转换 'ArchiveBoundedContext.Infrastructure.Contexts.ArchiveBoundedContext' 到“System.Data.Entity.DbContext”。 f:\Last Version Of Projects\Archiver-master\SharedKernel.Infrastructure\bin\Debug\SharedKernel.Infrastructure.dll ArchiveBoundedContext.Application

通用存储库：

    public abstract class Repository<TEntity, TContext>
    where TEntity : class
    where TContext : DbContext, new()
{
    private DbSet<TEntity> _set;

    public TContext ActiveContext { get; set; }

    protected Repository()
    {
        ActiveContext = new TContext();
    }

    public DbSet<TEntity> Set
    {
        get { return _set ?? (_set = ActiveContext.Set<TEntity>()); }
    }

    public TEntity Create()
    {
        return Set.Create();
    }

    public int Add(TEntity item)
    {
        Set.Add(item);
        return ActiveContext.SaveChanges();
    }

    public int Remove(TEntity item)
    {
        Set.Remove(item);
        return ActiveContext.SaveChanges();
    }

    public int Update()
    {
        return ActiveContext.SaveChanges();
    }
}

ArchiveRepository：

public class ArchiveRepository : Repository<PersonIdentificationImage, Contexts.ArchiveBoundedContext>, IArchiveRepository
{
    public ArchiveRepository() { }

    public void AddPersonIdentificationImage(PersonIdentificationImage personIdentificationImage)
    {
        var ctx = ActiveContext;
        ctx.PersonIdentificationImages.Add(personIdentificationImage);
    }
}

存档服务：

public class ArchiveService : IArchiveService
{
    private readonly ArchiveRepository _archiveRepository;

    public ArchiveService()
    {
        _archiveRepository = new ArchiveRepository();
    }
}

QTasArchiveBaseContext：

public class QTasArchiveBaseContext<TContext> : DbContext where TContext : DbContext 
{
    static QTasArchiveBaseContext()
    {
        Database.SetInitializer<TContext>(null);
    }

    protected QTasArchiveBaseContext()
        : base(DatabaseSettings.Default.QTasArchiveDatabaseConString)
    { }
}

ArchiveBoundedContext：

public class ArchiveBoundedContext : QTasArchiveBaseContext<ArchiveBoundedContext>
{
    public DbSet<PersonOtherImage> PersonScannedImages { get; set; }

    public DbSet<PersonIdentificationImage> PersonIdentificationImages { get; set; }
}

Answer 1

在Repository 类中，将DbContext 替换为class：

  public abstract class Repository<TEntity, TContext>
    where TEntity : class
    where TContext : DbContext, new()

  public abstract class Repository<TEntity, TContext>
        where TEntity : class
        where TContext : class
{
     private DbSet<TEntity> _set;

     public TContext ActiveContext { get; set; }

     public Repository(TContext dbContext)
     {
          ActiveContext = dbContext;
     }

     ....
}

这行得通吗？