.NET Core .NET AutoMapper
▌Introduction
This
article will show a few samples for how to use them.
▌Environment
▋AutoMapper 8.0.0
▌Implement
We are
going to convert a MyClass1 object to MyClas2 object, that the classes are like
following,
▋MyClass1
public class MyClass1 {
public string Amount { get; set; }
public string PayDate { get; set; }
public string PayTime { get; set; }
}
▋MyClass2
public class MyClass2 {
public decimal Amount { get; set; }
public DateTime PayOn { get; set; }
}
▋ ITypeConverter
If the source and destination
classes have too many differences to map their properties, we can implement ITypeConverter to put all the convert logic inside.
|
public class MyConverter : ITypeConverter<MyClass1, MyClass2>
{
public DtoMerchantCreation Convert(MyClass1 source, MyClass2 destination, ResolutionContext context)
{
// Convert MyClass1 instance to MyClass2
}
}
Usage:
var configuration = new MapperConfiguration(cfg => {
cfg.CreateMap<MyClass1, MyClass2>().ConvertUsing<MyConverter>();
});
▋ IValueConverter
Implement IValueConverter if the destination property’s value comes from a single
property of the source.
|
public class AmountConverter : IValueConverter<string, decimal>
{
public decimal Convert(string sourceMember, ResolutionContext context)
{
// Convert string to decimal
}
}
Usage:
var configuration = new MapperConfiguration(cfg => {
cfg.CreateMap<MyClass1, MyClass2>()
.ForMember(dest => dest.Amount, opt => opt.ConvertUsing(new AmountConverter()));
});
▋ IValueResolver
Implement IValueResolver if the destination property’s value comes from multiple
properties of the source.
|
public class PayOnResolver : IValueResolver<MyClass1, MyClass2, DateTime>
{
public DateTime Resolve(MyClass1 source, MyClass2 destination, DateTime destMember, ResolutionContext context)
{
string dateTimeStr = $"{source.PayDate} {source.PayTime}+08:00"; // e.q. "2020-03-10 08:00:00+08:00"
return Convert.ToDateTime(dateTimeStr);
}
}
Usage:
var configuration = new MapperConfiguration(cfg => {
cfg.CreateMap<MyClass1, MyClass2>()
.ForMember(dest => dest.PayOn, opt =>
opt.MapFrom<PayOnResolver>())
});
Notice
that if we have the other class: MyClassA, which inherits MyClass1
public class MyClassA : MyClass1 {
}
Then it
can also reuse the PayOnResolver as well. For example,
var configuration = new MapperConfiguration(cfg => {
cfg.CreateMap<MyClassA, MyClass2>()
.ForMember(dest => dest.PayOn, opt =>
opt.MapFrom<PayOnResolver>())
});
▌Reference
