EF 4.1流利API分貝第一關係映射問題

Question

我有以下表，

1. 產品（pro_iIDX [PK]，pro_sName）
2. 製造商（man_iIDX [PK]，man_sName）
3. ProductManufacturer（ pma_iIDX [PK]，pma_iProductRef [FK]，pma_iManufacturerRef [FK]，pma_bAvailable）

我有以下波蘇斯，

public class ProductInfo 
{ 
    public int IDX { get; set; } 
    public string Name { get; set; } 

    public virtual ICollection<ProductManufacturerInfo> C0ProductManufacturers 
     { get; set; } 
} 

public class ManufacturerInfo 
{ 
    public int IDX { get; set; } 
    public string Name { get; set; } 

    public virtual ICollection<ProductManufacturerInfo> C0ProductManufacturers 
     { get; set; } 
} 

public class ProductManufacturerInfo 
{ 
    public int IDX { get; set; } 
    public bool Available { get; set; } 

    public virtual ManufacturerInfo C0Manufacturer { get; set; } 
    public virtual ProductInfo C0ProductInfo { get; set; } 
} 

我已經使用沒有成功以下映射，

public ProductManufacturerConfiguration() 
{ 
    ToTable("ProductManufacturer"); 
    HasKey(p => p.IDX); 
    Property(p => p.IDX).HasColumnName("pma_iIDX"); 
    Property(p => p.Available).HasColumnName("pma_bAvailable"); 
    Property(p => p.ProductRef).HasColumnName("pma_iProductRef"); 
    Property(p => p.ManufacturerRef).HasColumnName("pma_iManufacturerRef"); 

    //I have tried 
    HasRequired(p => p.ManufacturerInfo) 
      .WithMany(c => c.C0ProductManufacturers) 
      .Map(m => m.MapKey("pma_iManufacturerRef")); 
    HasRequired(p => p.ProductInfo) 
      .WithMany(c => c.C0ProductManufacturers) 
      .Map(m => m.MapKey("pma_iProductRef")); 

    //As well as 
    HasRequired(p => p.C0Manufacturer) 
      .WithMany(c => c.C0ProductManufacturers) 
      .HasForeignKey(p => p.ManufacturerRef); 
    HasRequired(p => p.C0Product) 
      .WithMany(c => c.C0ProductManufacturers) 
      .HasForeignKey(p => p.C0Product); 
} 

從我的考驗，dB一抱怨找不到ManufacturerInfo_IDX當我執行以下，

var query = from p in _context.Product 
    select p; 

如果我第一次去的代碼路線，將創建以下表，

ProductManufacturer(
      pma_iIDX[PK], 
      pma_iProductRef, 
      pma_iManufacturerRef, 
      pma_bAvailable, 
      ManufacturerInfo_IDX, 
      ProductInfo_IDX) 

任何援助將是非常的應用reciated。

Answer 1

主要問題是您的ProductManufacturerInfo密鑰不應該是IDX。 IDX在多對多關聯中更像是「有效載荷」。解決這個問題的一個方法是指定一個真正的鍵，然後映射很簡單：

public class ProductManufacturerInfo 
{ 
    public int IDX { get; set; } 
    public bool Available { get; set; } 

    public int C0ManufacturerIDX { get; set; } 
    public virtual ManufacturerInfo C0Manufacturer { get; set; } 

    public int C0ProductInfoIDX { get; set; } 
    public virtual ProductInfo C0ProductInfo { get; set; } 
} 

那麼你的映射：

public class ProductManufacturerConfiguration 
    : EntityTypeConfiguration<ProductManufacturerInfo> 
{ 
    public ProductManufacturerConfiguration() 
    { 
     ToTable("ProductManufacturer"); 
     HasKey(p => new { p.C0ManufacturerIDX, p.C0ProductInfoIDX }); 
     Property(p => p.IDX) 
      .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); 
    } 
} 

Answer 2

我很難相信，您提供的樣本是你真正的代碼，因爲它甚至不編譯。難以複製真實的代碼來顯示問題嗎？

這工作：

public class ProductInfo 
{ 
    public int IDX { get; set; } 
    public string Name { get; set; } 

    public virtual ICollection<ProductManufacturerInfo> C0ProductManufacturers 
    { get; set; } 
} 

public class ManufacturerInfo 
{ 
    public int IDX { get; set; } 
    public string Name { get; set; } 

    public virtual ICollection<ProductManufacturerInfo> C0ProductManufacturers 
    { get; set; } 
} 

public class ProductManufacturerInfo 
{ 
    public int IDX { get; set; } 
    public bool Available { get; set; } 

    public int ManufacturerRef { get; set; }   
    public virtual ManufacturerInfo C0Manufacturer { get; set; } 

    public int ProductRef { get; set; } 
    public virtual ProductInfo C0ProductInfo { get; set; } 
} 

public class ProductManufacturerConfiguration : EntityTypeConfiguration<ProductManufacturerInfo> 
{ 
    public ProductManufacturerConfiguration() 
    { 
     ToTable("ProductManufacturer"); 
     HasKey(p => p.IDX); 
     Property(p => p.IDX).HasColumnName("pma_iIDX"); 
     Property(p => p.Available).HasColumnName("pma_bAvailable"); 
     Property(p => p.ProductRef).HasColumnName("pma_iProductRef"); 
     Property(p => p.ManufacturerRef).HasColumnName("pma_iManufacturerRef"); 

     //I have tried 
     HasRequired(p => p.C0Manufacturer) 
       .WithMany(c => c.C0ProductManufacturers) 
       .Map(m => m.MapKey("pma_iManufacturerRef")); 
     HasRequired(p => p.C0ProductInfo) 
       .WithMany(c => c.C0ProductManufacturers) 
       .Map(m => m.MapKey("pma_iProductRef")); 

     //As well as 
     HasRequired(p => p.C0Manufacturer) 
       .WithMany(c => c.C0ProductManufacturers) 
       .HasForeignKey(p => p.ManufacturerRef); 
     HasRequired(p => p.C0ProductInfo) 
       .WithMany(c => c.C0ProductManufacturers) 
       .HasForeignKey(p => p.ProductRef); 
    } 
}