Question

我有以下代码：

public class CoursesController : ApiController
{
    private ITanulmanyokEntities _entities;

    public CoursesController()
        : this(new TanulmanyokEntities()) // ERROR HERE
    {
    }
    public CoursesController(ITanulmanyokEntities entities)
    {
        if (entities == null)
            throw new ArgumentNullException("entities");

        _entities = entities;
    }

}

在这里，我创建了一个界面：

public interface ITanulmanyokEntities : IDisposable
{
    Int32 SaveChanges();

    DbSet<Application> Applications { get; set; }
    DbSet<Course> Courses { get; set; }
    DbSet<EducationSubject> EducationSubjects { get; set; }
    DbSet<EducationUser> EducationUsers { get; set; }
    DbSet<Program> Programs { get; set; }

}

这应该是从数据库生成的实体的接口：

public partial class TanulmanyokEntities : DbContext
{
    public TanulmanyokEntities()
        : base("name=TanulmanyokEntities")
    {
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

    public virtual DbSet<Application> Applications { get; set; }
    public virtual DbSet<Course> Courses { get; set; }
    public virtual DbSet<EducationSubject> EducationSubjects { get; set; }
    public virtual DbSet<EducationUser> EducationUsers { get; set; }
    public virtual DbSet<Program> Programs { get; set; }
}

然而，我似乎无法将一个转换为另一个。请参阅注释行。问题是，我的编译器无法转换接口/真实的东西。我想我实现了所有必须实现的东西（我也遵循一些有效的示例代码）。我错过了什么？

Answer 1

您需要声明TanulmanyokEntities实施ITanulmanyokEntities

public partial class TanulmanyokEntities：DbContext，ITanulmanyokEntities

Answer 2

解决方案是创建另一个部分类：

public partial class TanulmanyokEntities : ITanulmanyokEntities
{
}

这样，我就不必弄乱生成的代码了。

C＃ - 无法将实体接口强制转换为实体

2 个答案: