如何在连接 table 是架构一部分的 EF Core 中指定多对多关系？

Question

在 https://docs.microsoft.com/en-us/ef/core/modeling/relationships?tabs=fluent-api%2Cfluent-api-simple-key%2Csimple-key#joining-relationships-configuration 上，他们有以下示例说明如何在 Entity Framework 核心中指定多对多关系：

modelBuilder.Entity<Post>()
    .HasMany(p => p.Tags)
    .WithMany(p => p.Posts)
    .UsingEntity<Dictionary<string, object>>(
        "PostTag",
        j => j
            .HasOne<Tag>()
            .WithMany()
            .HasForeignKey("TagId")
            .HasConstraintName("FK_PostTag_Tags_TagId")
            .OnDelete(DeleteBehavior.Cascade),
        j => j
            .HasOne<Post>()
            .WithMany()
            .HasForeignKey("PostId")
            .HasConstraintName("FK_PostTag_Posts_PostId")
            .OnDelete(DeleteBehavior.ClientCascade));

如何做同样的事情，但指定 PostTag 是架构的一部分而不是默认架构？

例如，Test.PostTag 和 [Test].[PostTag] 不起作用。尝试访问资源时，只会导致抛出异常 Microsoft.Data.SqlClient.SqlException: 'Invalid object name 'PostTag'.'。因此，当我尝试指定它时，它似乎忽略了模式名称 Test。

Answer 1

我所做的就是按照他们在页面上写的那样做 https://www.learnentityframeworkcore.com/configuration/many-to-many-relationship-configuration。在他们的示例中，他们有以下两个 classes:

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; }
}

然后他们做了以下 class 通过 many-to-many 关系将他们联系起来：

public class BookCategory
{
    public int BookId { get; set; }
    public Book Book { get; set; }
    public int CategoryId { get; set; }
    public Category Category { get; set; }
}

然后他们有以下配置：

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);
}

在我的例子中，我这样配置连接 class：

internal class AccountRuleEntityTypeConfiguration : IEntityTypeConfiguration<CompAccountRule>
{
    public void Configure(EntityTypeBuilder<AccountRule> builder)
    {
        builder
            .ToTable("AccountRules", "Compliance");
        builder
            .HasKey(x => new { x.AccountId, x.RuleInstanceId });
        builder
            .HasOne(x => x.Account)
            .WithMany(x => x.AccountRules)
            .HasForeignKey(x => x.AccountId);
        builder
            .HasOne(x => x.RuleInstance)
            .WithMany(x => x.AccountRules)
            .HasForeignKey(x => x.RuleInstanceId);
    }
}

Account属于默认命名空间，RuleInstance属于Compliance命名空间，而这个连接tableAccountRule也属于Compliance 命名空间，我可以通过语句 builder.ToTable("AccountRules", "Compliance");.

配置

如何在连接 table 是架构一部分的 EF Core 中指定多对多关系？

How do I specify a many-to-many relationship in EF Core where the connection table is part of a schema?

.net

c#

entity-framework-core