MapsterMapper如何指定仅映射指定字段（如Age、Name）？

可以实现，Mapster提供了多种方式来指定仅映射部分字段，以下是针对你的需求的常用实现方式：

方法一：排除不需要映射的字段 #

通过Ignore方法直接排除不需要映射的Address字段，剩余字段会自动映射：

var config = TypeAdapterConfig.GlobalSettings.Clone();
config.ForType<People, PeopleDto>()
      .Ignore(dest => dest.Address)
      .MaxDepth(2);

// 使用配置进行映射
var people = new People { Age = 25, Name = "John", Address = "123 Main St" };
var peopleDto = people.Adapt<PeopleDto>(config);
// peopleDto.Address 会保持默认值（null）

方法二：显式指定需要映射的字段 #

通过Map方法逐个定义需要映射的字段，未指定的字段会保留默认值：

var config = TypeAdapterConfig.GlobalSettings.Clone();
config.ForType<People, PeopleDto>()
      .Map(dest => dest.Age, src => src.Age)
      .Map(dest => dest.Name, src => src.Name)
      .MaxDepth(2);

// 使用配置进行映射
var people = new People { Age = 25, Name = "John", Address = "123 Main St" };
var peopleDto = people.Adapt<PeopleDto>(config);
// peopleDto.Address 为默认值

方法三：临时映射配置 #

如果只需要单次映射生效，可以在Adapt方法中直接临时配置映射规则：

var people = new People { Age = 25, Name = "John", Address = "123 Main St" };
var peopleDto = people.Adapt<PeopleDto>(cfg => cfg
    .Map(dest => dest.Age, src => src.Age)
    .Map(dest => dest.Name, src => src.Name)
);
// peopleDto.Address 保持默认值

内容的提问来源于stack exchange，提问作者pedoc