如何在自定义类型转换器中使用自定义值解析器
本文关键字:自定义 转换器 类型 类型转换 | 更新日期: 2023-09-27 18:17:53
如何在自定义类型转换器内使用自定义值解析器?目前,这在我看来很难实现。你知道我怎么用这门课吗?
人转换器
class PersonConverter : ITypeConverter<PersonData, Person>
{
public Person Convert(ResolutionContext context)
{
var personData = context.SourceValue as PersonData;
if (personData == null)
{
return null;
}
var person = new Person
{
Name = personData.Name
};
//person.Dic = // use here my DictionaryResolver
return person;
}
}
class Person
{
public string Name { get; set; }
public Dictionary Dic { get; set; }
}
class PersonData
{
public string Name { get; set; }
public int DicId { get; set; }
}
class Dictionary
{
public int Id { get; set; }
public string Name { get; set; }
}
价值解析器
class DictionaryResolver : ValueResolver<int, Dictionary>
{
protected override Dictionary ResolveCore(int source)
{
// do something
return new Dictionary
{
Id = source,
Name = "Name"
};
}
}
自定义值解析器设计用于在AutoMapper要映射对象时重写特定成员的映射:
Mapper.CreateMap<PersonData, Person>()
.ForMember(dest => dest.Dic, opt => opt.ResolveUsing<DictionaryResolver>());
但是,当您使用自定义类型解析器时,这将完全控制映射:没有办法自定义如何映射一个特定的成员:
Mapper.CreateMap<TPersonData, Person>().ConvertUsing(PersonConverter ); // No ForMember here.
然而,考虑到你在类型转换过程中有完全控制,没有什么可以阻止你重用值转换器,你只需要特别引用它:然而,你必须添加一个返回受保护方法ResolveCore
的公共方法:
class DictionaryResolver : ValueResolver<int, Dictionary>
{
public Dictionary Resolve(int source)
{
return ResolveCore(source);
}
protected override Dictionary ResolveCore(int source)
{
// do something
return new Dictionary
{
Id = source,
Name = "Name"
};
}
}
然后在类型转换期间调用它来解析该属性:
var person = new Person
{
Name = personData.Name
};
DictionaryResolver resolver = new DictionaryResolver();
person.Dic = resolver.Resolve(personData.IntValue); // whatever value you use