Question

我与其他实体有多对多关系来管理关联。

实体如下：

public class WorkOrderItem : EntityBase
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long WorkOrderItemId { get; set; }

    public virtual ICollection<WorkOrderItemLanguage> WorkOrderItemLanguages { get; set; } 

}

 public class WorkOrderItemLanguage
{

    [Key, Column(Order = 0), DatabaseGenerated(DatabaseGeneratedOption.None)]
    public long WorkOrderItemId { get; set; }
    [Key, Column(Order = 1), DatabaseGenerated(DatabaseGeneratedOption.None)]
    public string LanguageId { get; set; }
    [Key, Column(Order = 2), DatabaseGenerated(DatabaseGeneratedOption.None)]
    public LanguageType LanguageType { get; set; }

    public virtual WorkOrderItem WorkOrderItem { get; set; }
    public virtual Language Language { get; set; }
}


public class Language : EntityBase
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public string LanguageId { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public string Code { get; set; }
    public string IsoCode { get; set; }
    public int Ordinal { get; set; }

    public virtual ICollection<WorkOrderItemLanguage> WorkOrderItemLanguages { get; set; } 

}

模型构建器配置

public class WorkOrderItemConfiguration : EntityTypeConfiguration<WorkOrderItem>
{
    public WorkOrderItemConfiguration()
    {
        HasMany(x => x.WorkOrderItemLanguages).WithRequired(x => x.WorkOrderItem).HasForeignKey(x => x.WorkOrderItemId);
    }
}

public class LanguageConfiguration : EntityTypeConfiguration<Language>
{
    public LanguageConfiguration()
    {
        HasMany(x => x.WorkOrderItemLanguages).WithRequired(x => x.Language).HasForeignKey(x => x.LanguageId);
    }
}

如果生成查询以选择包含与其相关的所有语言的WorkOrderItem，我如何包含语言实体？

以下查询未加载语言实体

 UnitOfWork.Set<WorkOrderItem>()
            .Include(x => x.WorkOrderItemLanguages.Select(l=>l.Language))
            .FirstOrDefault(x.WorkOrderItemId == id);

Answer 1

试试这个

var TesteEntities = UnitOfWork.Set<WorkOrderItem>()
        .Include("WorkOrderItemLanguages.Language")
        .FirstOrDefault(x.WorkOrderItemId == id);

你会在这里找到语言

渴望加载与关联实体 - 实体框架的多对多关系

1 个答案: