此处的问题是因为两个或多个子存根具有相同的密钥：0。一旦尝试附加第一个对象，它将引发错误。

The problem here is because two or more child stubs have the same key: 0. Once you try to Attach the first object, it fires the error.

必须使用某种DTO重新设计该方法（我认为将ViewModel对象传递给Domain Model层是不正确的，这就是为什么我使用存根）。或直接从Controller调用添加/修改函数。

The method will have to be redesigned, using some kind of DTO (I think it's not correct to pass the ViewModel object to the Domain Model layer, thats why I was using stubs). Or calling a function to Add/Modify direct from the Controller.

编辑：

以下是代码：

public void EditReport(Inspection obj)
{
    var inspection = new tbl_inspection
    {
        id_inspection = obj.ID,
        code = obj.Code       
    };

    foreach (var roll in obj.Rolls)
    {                    
        var rollStub = new tbl_inspection_roll
        {
            id_inspection_roll = roll.ID,
            id_inspection = obj.ID,
            description = roll.Description
        };

        container.tbl_inspection_roll.Attach(roll);
        container.ObjectStateManager.ChangeObjectState(roll, (roll.id_inspection_roll == 0) ? EntityState.Added : EntityState.Modified);
    }

    container.tbl_inspection.Attach(inspection);
    container.ObjectStateManager.ChangeObjectState(inspection, EntityState.Modified);

    container.SaveChanges();
}

欢迎使用更好的解决方案...

Any better solutions are welcomed...