ninject - Ninject 无效转换异常

Question

public partial class CTMSEntitiesModel : OpenAccessContext, ICTMSEntitiesModelUnitOfWork
{
    public CTMSEntitiesModel(string connection)
:base(connection, backend, metadataSource)
{ }
    // there are more IQueryable requests here
}

public interface ICTMSEntitiesContext : ICTMSEntitiesModelUnitOfWork
{
    FetchStrategy FetchStrategy { get; set; }
}

public interface ICTMSEntitiesModelUnitOfWork : IUnitOfWork
{
    //all the IQueryable requests are here
}

我需要将 ICTMSEntitiesContext 绑定到 CTMSEntitiesModel。我该怎么做呢？当我这样做时，我做错了什么？它正在抛出 InvalidCastException。

kernel.Bind(typeof(CTMSDAL.ICTMSEntitiesContext)).To(typeof(CTMSDAL.CTMSEntitiesModel)).InRequestScope()
            .WithConstructorArgument("connection", System.Configuration.ConfigurationManager.ConnectionStrings["CTMS_MVCConnection"].ConnectionString);

我将不胜感激您能提供的所有帮助！谢谢，萨弗里斯

Answer 1

你必须ICTMSEntitiesContext在CTMSEntitiesModel类中实现。否则无法将类的实例强制转换为目标接口。

鉴于您使用的是 OpenAccess 并且可能会自动生成上下文类，我建议您将接口实现添加到不同项目文件中的新部分类中，以避免在重新生成原始文件后丢失自定义代码：

public partial class CTMSEntitiesModel : ICTMSEntitiesContext
{
    // FetchStrategy property is already defined
}