使用 TPT EF 进行多级继承

如何解决使用 TPT EF 进行多级继承

我有以下几点：

[Table(nameof(GenTasks))]
public class GenTasks : EntityData
{
    public string TaskTitle;
    ...
}
    
[Table(nameof(GenProjectTasks))]
public class GenProjectTasks : GenTasks
{
    public string ProjectTitle;
    ...
}   


[Table(nameof(GenMkProjectTasks))]
public class GenMkProjectTasks : GenProjectTasks
{
    public string AdTitle;
    ...
}

每当我尝试查询特定的 GenMkProjectTasks 时，我都会收到此错误：

- Error: All objects in the EntitySet 'GenTasks' must have unique primary keys. However,an instance of type 'GenMkProjectTasks' and an instance of type 'GenTasks' both have the same primary key value.

我不知道是我有设计错误还是有不同的方式来查询表 GenMkProjectTasks。

我已经试过了：

var mkTask = ctx.GenMkProjectTasks.Where(s => s.Id == task.Id).Single();
var mkTask = ctx.GenProjectTasks.OfType<GenMkProjectTasks>().Where(s => s.Id == task.Id).Single();
var mkTask = ctx.GenTasks.OfType<GenMkProjectTasks>().Where(s => s.Id == task.Id).Single();
var mkTask = ctx.GenTasks.OfType<GenProjectTasks>().OfType<GenMkProjectTasks>().Where(s => s.Id == task.Id).Single();

提前致谢。