EFCore 多对多配制映射问题
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[已解决问题]
解决于 2017-11-12 23:34
具体错误信息：Cannot remove key {'Id'} from entity type 'Category' because it is referenced by a foreign key in entity type 'CategoryProducts'. All foreign keys must be removed or redefined before the referenced key can be removed.”
最佳答案
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最终问题已经找到由于doman的BaseEntiy Id {set } 为Private，我改为public就没有问题了
其他回答(1)
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public class Book
{
public int BookId { get; set; }
public string Title { get; set; }
public Author Author { get; set; }
public ICollection<Category> Categories { get; set; }
}
public class Category
{
public int CategoryId { get; set; }
public string CategoryName { get; set; }
public ICollection<Book> Books { get; set; }
}public class Book
{
public int BookId { get; set; }
public string Title { get; set; }
public Author Author { get; set; }
public ICollection<BookCategory> BookCategories { get; set; }
}
public class Category
{
public int CategoryId { get; set; }
public string CategoryName { get; set; }
public ICollection<BookCategory> BookCategories { get; set; }
}
public class BookCategory
{
public int BookId { get; set; }
public Book Book { get; set; }
public int CategoryId { get; set; }
public Category Category { get; set; }
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<BookCategory>()
.HasKey(bc => new { bc.BookId, bc.CategoryId });
modelBuilder.Entity<BookCategory>()
.HasOne(bc => bc.Book)
.WithMany(b => b.BookCategories)
.HasForeignKey(bc => bc.BookId);
modelBuilder.Entity<BookCategory>()
.HasOne(bc => bc.Category)
.WithMany(c => c.BookCategories)
.HasForeignKey(bc => bc.CategoryId);
}你参考一下上面这个配置，Reference
谢谢回复，问题已找到，是在写baseEntity的时候把id的set属性设置了私有了，所以才出这个问题
