Entity framework 在联接表中首先编码Fluent API和导航属性

我有四个实体，我想通过CodeFirstFluentAPI将它们转换成数据库表（我使用的是databaseanswers.org上的模型），但我不确定如何转换。我遇到的问题是SuggestedMenuId在一个复合键（MenuCourse和CourseRecipeChoice）中跨两个不同的表迁移

以下是我得到的信息：

“在模型生成过程中检测到一个或多个验证错误：

\tSystem.Data.Entity.Edm.edmsociationConstraint:：关系约束中从属角色和主体角色中的属性数必须相同。”

这是我在EntityTypeConfiguration类中尝试的内容，显然是不正确的

public class CourseRecipeChoiceConfiguration : EntityTypeConfiguration<CourseRecipeChoice>
{
    public CourseRecipeChoiceConfiguration()
    {
        HasKey(crc => new { crc.Id});
        HasRequired(r => r.Recipe).WithMany(crc => crc.CourseRecipeChoices).HasForeignKey(crc => crc.RecipeId);
        HasRequired(m => m.MenuCourse).WithMany(crc => crc.CourseRecipeChoices).HasForeignKey(crc => crc.MenuCourseId);
        HasRequired(m => m.MenuCourse).WithMany(crc => crc.CourseRecipeChoices).HasForeignKey(crc => crc.SuggestedMenu_MenuCourseId);
    }
}

公共类课程RecipechoiceConfiguration:EntityTypeConfiguration
{
公共课程RecipechoiceConfiguration（）
{
HasKey（crc=>new{crc.Id}）；
HasRequired（r=>r.Recipe）。WithMany（crc=>crc.CourseRecipeChoices）。HasForeignKey（crc=>crc.RecipeId）；
HasRequired（m=>m.MenuCourse）。WithMany（crc=>crc.CourseRecipeChoices）。HasForeignKey（crc=>crc.MenuCourseId）；
HasRequired（m=>m.MenuCourse）。WithMany（crc=>crc.CourseRecipeChoices）。HasForeignKey（crc=>crc.SuggestedMenu\u MenuCourseId）；
}
}

导航属性的正确语法和CourseRecipeChoice联接表的fluent api语法的正确语法是什么

public class SuggestedMenu
{
    public int SuggestedMenuId { get; set; }

    public virtual ICollection<MenuCourse> MenuCourses { get; set; }
}

public class MenuCourse
{
    public int Id { get; set; }
    public int SuggestedMenuId { get; set; }

    public SuggestedMenu SuggestedMenu { get; set; }
    public virtual ICollection<CourseRecipeChoice> CourseRecipeChoices { get; set; }
}

public class CourseRecipeChoice
{
    public int SuggestedMenuId { get; set; }
    public int MenuCourseId { get; set; }
    public int Id { get; set; }
    public int RecipeId { get; set; }

    //How do I represent the navigation properties in this class? 

}

public class Recipe
{
    public int RecipeId { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }

    public ICollection<CourseRecipeChoice> CourseRecipeChoices { get; set; }
}

公共类建议菜单
{
public int SuggestedMenuId{get；set；}
公共虚拟ICollection菜单课程{get；set；}
}
公共类菜单课程
{
公共int Id{get；set；}
public int SuggestedMenuId{get；set；}
公共建议菜单建议菜单{get；set；}
公共虚拟ICollection CourseRecipeChoices{get；set；}
}
公共课
{
public int SuggestedMenuId{get；set；}
public int MenuCourseId{get；set；}
公共int Id{get；set；}
public int RecipeId{get；set；}
//如何表示此类中的导航属性？
}
公共课食谱
{
public int RecipeId{get；set；}
公共字符串名称{get；set；}
公共字符串说明{get；set；}
公共ICollection CourseRecipeChoices{get；set；}
}

关键点如下：

• 建议菜单（Id）
• 菜单课程（Id，SuggestedMenuId）
• CourseRecipeChoice（Id，SuggestedMenuId，MenuCourseId，RecipeId）//这实际上是我感到困惑的地方，因为根据模型，SuggestedMenuId是SuggestedMenus中的PK，是MenuCourse和CourseRecipeChoice中的PF（这可能是糟糕的设计吗？）
• 配方（RecipeId）

---

…根据手头的信息（钥匙、关系不完全清楚），
这是最复杂的场景，应该涵盖你可能拥有的我认为

public class SuggestedMenu
{
    public int SuggestedMenuId { get; set; }
    public string Description { get; set; }
    public virtual ICollection<MenuCourse> MenuCourses { get; set; }
    // public virtual ICollection<CourseRecipeChoice> CourseRecipeChoices { get; set; }
}
public class MenuCourse
{
    public int MenuCourseId { get; set; }
    public int SuggestedMenuId { get; set; }
    public SuggestedMenu SuggestedMenu { get; set; }
    public virtual ICollection<CourseRecipeChoice> CourseRecipeChoices { get; set; }
}
public class CourseRecipeChoice
{
    public int CourseRecipeChoiceId { get; set; }
    public int MenuCourseId { get; set; }
    public int SuggestedMenuId { get; set; }
    public int RecipeId { get; set; }
    // no virtuals if required, non-optional 
    public Recipe Recipe { get; set; }
    public MenuCourse MenuCourse { get; set; }
    // public SuggestedMenu SuggestedMenu { get; set; }
}
public class Recipe
{
    public int RecipeId { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public virtual ICollection<CourseRecipeChoice> CourseRecipeChoices { get; set; }
}

…并进行测试，例如

        using (var db = new YourDbContext())
        {
            SuggestedMenu suggestedmenu = new SuggestedMenu { Description = "suggested menu" };
            var menucourse = new MenuCourse { MenuCourseId = 2, SuggestedMenu = suggestedmenu };
            var recipe = new Recipe { Name = "My recipe", Description = "recipe desc" };
            var crc = new CourseRecipeChoice { CourseRecipeChoiceId = 2, MenuCourse = menucourse, Recipe = recipe, };
            db.CourseRecipeChoices.Add(crc);
            int recordsAffected = db.SaveChanges();
            foreach (var crcs in db.CourseRecipeChoices.Include(c => c.MenuCourse).Include(c => c.Recipe))
            {
                Console.WriteLine("{0}, {1}, {2}, {3}", crcs.MenuCourse.MenuCourseId, crcs.MenuCourse.SuggestedMenuId, crcs.Recipe.Name, crcs.Recipe.Description);
            }
        }

---

你能告诉我每张桌子的键是什么吗？外键是什么？我猜，但不确定。“我认为应该没有更大的问题了。@NSGaga我还没有阅读您的回答，但我确实更新了问题，添加了关键点……我会尝试一下，并尽快报告。效果非常好！”！谢谢你今天帮我学习新东西！完成！我走出办公室回来，因为我忘了这么做：）

        using (var db = new YourDbContext())
        {
            SuggestedMenu suggestedmenu = new SuggestedMenu { Description = "suggested menu" };
            var menucourse = new MenuCourse { MenuCourseId = 2, SuggestedMenu = suggestedmenu };
            var recipe = new Recipe { Name = "My recipe", Description = "recipe desc" };
            var crc = new CourseRecipeChoice { CourseRecipeChoiceId = 2, MenuCourse = menucourse, Recipe = recipe, };
            db.CourseRecipeChoices.Add(crc);
            int recordsAffected = db.SaveChanges();
            foreach (var crcs in db.CourseRecipeChoices.Include(c => c.MenuCourse).Include(c => c.Recipe))
            {
                Console.WriteLine("{0}, {1}, {2}, {3}", crcs.MenuCourse.MenuCourseId, crcs.MenuCourse.SuggestedMenuId, crcs.Recipe.Name, crcs.Recipe.Description);
            }
        }