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Automapper to do datetime conversions
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| /****** | |
| An example to automatically perform datetime conversions using automapper | |
| Assumptions: | |
| * all inputs are in client Local time (MyInputModel) | |
| * all datetimes are stored as UTC (MyDto) | |
| * all datetimes retrieved from storage are in UTC and contain the destination timezone (MyDto) | |
| * if destination not supplied, use the server local time zone | |
| *******/ | |
| using System; | |
| using AutoMapper; | |
| namespace UtcConverter | |
| { | |
| class MyDto | |
| { | |
| public DateTime CreateDate; | |
| public string TimeZone; | |
| } | |
| class MyOutputModel | |
| { | |
| public DateTime CreateDate; | |
| public string TimeZone; | |
| } | |
| class MyInputModel | |
| { | |
| public DateTime CreateDate; | |
| } | |
| class DtoToOutputMapper | |
| { | |
| public static IMapper Mapper { get; private set; } | |
| static DtoToOutputMapper() | |
| { | |
| RegisterMappings(); | |
| } | |
| public static void RegisterMappings() | |
| { | |
| var config = new MapperConfiguration(cfg => | |
| { | |
| cfg.CreateMap<DateTime, DateTime>().ConvertUsing<UtcToLocalConverter>(); | |
| }); | |
| Mapper = config.CreateMapper(); | |
| } | |
| } | |
| class InputToDtoMapper | |
| { | |
| public static IMapper Mapper { get; private set; } | |
| static InputToDtoMapper() | |
| { | |
| RegisterMappings(); | |
| } | |
| public static void RegisterMappings() | |
| { | |
| var config = new MapperConfiguration(cfg => | |
| { | |
| cfg.CreateMap<DateTime, DateTime>().ConvertUsing<LocalToUtcConverter>(); | |
| cfg.CreateMap<MyInputModel, MyDto>().ForMember("TimeZone", opt => opt.Ignore()); | |
| }); | |
| Mapper = config.CreateMapper(); | |
| } | |
| } | |
| class UtcToLocalConverter : ITypeConverter<DateTime, DateTime> | |
| { | |
| public DateTime Convert(DateTime source, DateTime destination, ResolutionContext context) | |
| { | |
| var inputDate = source; | |
| if (inputDate.Kind == DateTimeKind.Utc) | |
| { | |
| var timeZoneId = context.Items.ContainsKey("tz") | |
| ? context.Items["tz"].ToString() | |
| : TimeZoneInfo.Local.Id; | |
| var localizedDate = TimeZoneInfo.ConvertTime( | |
| inputDate, | |
| TimeZoneInfo.Utc, | |
| TimeZoneInfo.FindSystemTimeZoneById(timeZoneId)); | |
| return localizedDate; | |
| } | |
| return inputDate; | |
| } | |
| } | |
| class LocalToUtcConverter : ITypeConverter<DateTime, DateTime> | |
| { | |
| public DateTime Convert(DateTime source, DateTime destination, ResolutionContext context) | |
| { | |
| var inputDate = source; | |
| if (inputDate.Kind != DateTimeKind.Utc) | |
| { | |
| return inputDate.ToUniversalTime(); | |
| } | |
| return inputDate; | |
| } | |
| } | |
| class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| MyInputModel myInput = new MyInputModel | |
| { | |
| CreateDate = new DateTime(2019, 6, 1, 3, 0, 0, 0, DateTimeKind.Local) | |
| }; | |
| MyDto dto = new MyDto(); | |
| MyOutputModel myOutput = new MyOutputModel(); | |
| InputToDtoMapper.Mapper.Map(myInput, dto); | |
| dto.TimeZone = "Mountain Standard Time"; | |
| DtoToOutputMapper.Mapper.Map(dto, myOutput, opt => opt.Items["tz"] = dto.TimeZone); | |
| Console.WriteLine($"input.createdDate = {myInput.CreateDate} ({myInput.CreateDate.Kind})"); | |
| Console.WriteLine($"dto.createDate = {dto.CreateDate} (UTC)"); | |
| Console.WriteLine($"output.createdDate = {myOutput.CreateDate} ({dto.TimeZone})"); | |
| Console.ReadKey(); | |
| } | |
| } | |
| } |
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