.net core使用AutoMapper

Posted 2022-05-16 sea1ee

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AutoMapper文档：http://docs.automapper.org/en/stable/The-MyGet-build.html

新的版本抛弃了静态API方法，我们将使用依赖注入来完成。

①添加包

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②创建MyAutoMapper.cs文件来创建实体和Dto之间的映射关系

 public class MyAutoMapper : Profile
    
        public MyAutoMapper()
        
            //实体和Dto的相互转化
            CreateMap<PFUserDto, PFUser>().ReverseMap();

 /// <summary>
    /// 用户表
    /// </summary>
    [Table("PF_User")]
    public class PFUser
    

        /// <summary>
        /// 主键
        /// </summary>
        [Column("UserGuid")]
        [Display(Name = "用户表主键", Description = "用户表主键")]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public Guid Id  get; set; 

        /// <summary>
        /// 用户名
        /// </summary>
        [Display(Description = "用户名", Name = "用户名")]
        [Column("UserName")]
        [StringLength(128)]
        public string  UserName  get; set; 

        /// <summary>
        /// 密码
        /// </summary>
        [Display(Description = "密码", Name = "密码")]
        [Column("UserPassWord")]
        [StringLength(256)]
        public string  UserPassWord  get; set; 

        /// <summary>
        /// 是否删除
        /// </summary>
        [Display(Description = "是否删除", Name = "是否删除")]
        [Column("IsDeleted")]
        public byte?  IsDeleted  get; set; 

        /// <summary>
        /// 创建日期
        /// </summary>
        [Display(Description = "创建日期", Name = "创建日期")]
        [Column("CreateDate")]
        public DateTime?  CreateDate  get; set;

 public class PFUserDto
    

        /// <summary>
        /// 主键
        /// </summary>
        [Column("UserGuid")]
        [Display(Name = "用户表主键", Description = "用户表主键")]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public Guid Id  get; set; 

        /// <summary>
        /// 用户名
        /// </summary>
        [Display(Description = "用户名", Name = "用户名")]
        [Column("UserName")]
        [StringLength(128)]
        public string UserName  get; set; 

        /// <summary>
        /// 密码
        /// </summary>
        [Display(Description = "密码", Name = "密码")]
        [Column("UserPassWord")]
        [StringLength(256)]
        public string UserPassWord  get; set; 

        /// <summary>
        /// 是否删除
        /// </summary>
        [Display(Description = "是否删除", Name = "是否删除")]
        [Column("IsDelte")]
        public byte? IsDeleted  get; set; 

        /// <summary>
        /// 创建日期
        /// </summary>
        [Display(Description = "创建日期", Name = "创建日期")]
        [Column("CreateDate")]
        public DateTime? CreateDate  get; set; 


        public string MyProperty  get; set;

③添加服务

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④使用：实体转Dto，Dto转实体也是一样的

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ProjectTo<>方法：

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值的转化，我们想给前端传的时间是字符串形式的，AutoMapper还允许我们自定义转化器来转化我们的数据类型

①创建DateTimeTypeConverter.cs文件

 /// <summary>
    /// DateTime2string
    /// </summary>
    public class DateTimeTypeConverter : ITypeConverter<DateTime, string>
    
        public string Convert(DateTime source, string destination, ResolutionContext context)
        
            return source.ToString("yyyy-MM-dd HH:mm:ss");

添加类型映射关系

public class MyAutoMapper : Profile
    
        public MyAutoMapper()
        
            //  可以给lambda表达式
            //CreateMap<DateTime, string>().ConvertUsing(x => x.ToString("yyyy-MM-dd HH:mm:ss"));
            //实现接口
            CreateMap<DateTime, string>().ConvertUsing<DateTimeTypeConverter>();
            //实体和Dto的相互转化
            CreateMap<PFUserDto, PFUser>().ReverseMap();