EF Core 关系配置 一对多 单向导航属性

一对多 单向导航属性

实体类：

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/// <summary>    /// 用户    /// </summary>    public class User    {        public long Id { get; set; }        /// <summary>        /// 姓名        /// </summary>        public string Name { get; set; }    }

　　

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/// <summary>     /// 请假申请单     /// </summary>     public class Leave     {         public long Id { get; set; }         /// <summary>         /// 申请人         /// </summary>         public User Requester { get; set; }         /// <summary>         /// 审批人         /// </summary>         public User? Approver { get; set; }         /// <summary>         /// 说明         /// </summary>         public string Remarks { get; set; }         /// <summary>         /// 开始日期         /// </summary>         public DateTime From { get; set; }         /// <summary>         /// 结束日期         /// </summary>         public DateTime To { get; set; }         /// <summary>         /// 状态         /// </summary>         public int Status { get; set; }     }

　　表结构：

 

 

 

 配置类：

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public class UserConfig : IEntityTypeConfiguration<User>     {         public void Configure(EntityTypeBuilder<User> builder)         {             builder.ToTable("T_Users");             builder.Property(m => m.Name).IsRequired().HasMaxLength(100).IsUnicode();         }     }

　　

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public class LeaveConfig : IEntityTypeConfiguration<Leave>    {        public void Configure(EntityTypeBuilder<Leave> builder)        {            builder.ToTable("T_Leaves");            //单向导航，仅需在“多端”有申明导航属性            //无主从关系            //单向导航配置：仅需在WithMany方法中不指定属性即可            builder.HasOne(m => m.Requester).WithMany();            builder.HasOne(m => m.Approver).WithMany();        }    }