AutoMapper在MVC中的运用04-string映射各种类型、一个属性映射多个属性等

本篇AutoMapper使用场景：

※ 类型转换，源string类型分别转换成int, DateTime,Type

※ 源和目标都包含复杂类型属性

※ 把源中的一个属性映射到目标中的多个属性

类型转换，源string类型分别转换成int, DateTime,Type

□ Domain model

public class Source2

{

public string Value1 { get; set; }

public string Value2 { get; set; }

public string Value3 { get; set; }

}

□ View model

public class Destination2

{

public int Value1 { get; set; }

public DateTime Value2 { get; set; }

public Type Value3 { get; set; }

}

□ 派生TypeConverter<,>自定义转换

//string转换成DateTime类型

public class DateTimeTypeConverter : TypeConverter<string,DateTime>

{

protected override DateTime ConvertCore(string source)

{

return System.Convert.ToDateTime(source);

}

}

//string转换成Type类型

//当然，这里的string必须是当前项目下的某个类

public class TypeTypeConverter : TypeConverter<string, Type>

{

protected override Type ConvertCore(string source)

{

Type type = Assembly.GetExecutingAssembly().GetType(source);

return type;

}

}

□ 映射配置

Mapper.CreateMap<string, int>().ConvertUsing(Convert.ToInt32);

Mapper.CreateMap<string, DateTime>().ConvertUsing<DateTimeTypeConverter>();

Mapper.CreateMap<string,Type>().ConvertUsing<TypeTypeConverter>();

Mapper.CreateMap<Source2, Destination2>();

□ 要点

类型转换用Convertusing<>()方法

源和目标都包含复杂类型属性

□ Domain model

public class OuterSource

{

public int Value { get; set; }

public InnerSource Inner { get; set; }

}

public class InnerSource

{

public int OtherValue { get; set; }

}

□ View model

public class OuterDest

{

public int Value { get; set; }

public InnerDest Inner { get; set; }

}

public class InnerDest

{

public int OtherValue { get; set; }

}

□ 映射配置

Mapper.CreateMap<OuterSource, OuterDest>();

Mapper.CreateMap<InnerSource, InnerDest>();

□ 使用

public ActionResult Nest()

{

var source = new OuterSource()

{

Value = 5,

Inner = new InnerSource(){OtherValue = 15}

};

var dest = Mapper.Map<OuterSource, OuterDest>(source);

return View(dest);

}

□ 要点

当源和目标都具有复杂属性并对应，复杂属性对应的类也需要配置映射。

把源中的一个属性映射到目标中的多个属性

□ Domain model

public class CalendarEvent

{

public DateTime EventDate { get; set; }

public string Title { get; set; }

}

public class CalendarEventForm

{

public DateTime EventDate { get; set; }

public int EventHour { get; set; }

public int EventMinute { get; set; }

public string Title { get; set; }

}

□ 自定义解析器

//转换成DateTime.Date

public class DateTimeToDateResolver : ValueResolver<CalendarEvent, DateTime>

{

protected override DateTime ResolveCore(CalendarEvent source)

{

return source.EventDate.Date;

}

}

//转换成DateTime.Hour

public class DateTimeToHourResolver : ValueResolver<CalendarEvent, int>

{

protected override int ResolveCore(CalendarEvent source)

{

return source.EventDate.Hour;

}

}

//转换成DateTime.Minute

public class DateTimeToMinuteResolver : ValueResolver<CalendarEvent, int>

{

protected override int ResolveCore(CalendarEvent source)

{

return source.EventDate.Minute;

}

}

□ 映射配置

Mapper.CreateMap<CalendarEvent, CalendarEventForm>()

.ForMember("EventDate", opt => opt.ResolveUsing<DateTimeToDateResolver>())

.ForMember("EventHour", opt => opt.ResolveUsing<DateTimeToHourResolver>())

.ForMember("EventMinute", opt => opt.ResolveUsing<DateTimeToHourResolver>());

□ 使用

public ActionResult Projection()

{

var calendarEvent = new CalendarEvent

{

EventDate = new DateTime(2008, 12, 15, 20, 30, 0),

Title = "Company Holiday Party"

};

CalendarEventForm from = Mapper.Map<CalendarEvent, CalendarEventForm>(calendarEvent);

return View(from);

}