问题描述
我有两个型号为我的形式，一个ViewModel将把它和ControlModel从它的到来。该ControlModel具有所有的相同的字段名和等级，但所有的字段是一个字符串数据类型。
I have two models for my form, a ViewModel going to it, and a ControlModel coming from it. The ControlModel has all the same field names and hierarchy, but all of the fields are a string data type.
你会如何编写AutoMapper将字符串字段转换为整数？我试图Int32.Parse（MyString的），但的Int32是不可用的表达式中（给出一个错误）。
How would you code AutoMapper to convert a string field to integer? I tried Int32.Parse(myString) but Int32 is not available within the expression (gives an error).
Mapper.CreateMap<SourceClass, DestinationClass>()
.ForMember(dest => dest.myInteger,
opt => opt.MapFrom(src => src.myString));
在类的类型及其相应的转换类型：
The types in the class and their corresponding conversion types:
字符串，INT，INT？一倍，两倍？日期时间和bool
string to int, int?, double, double?, DateTime, and bool
此外，有没有什么办法的方式来概括映射所有在目标整数均与该函数解析？换句话说，有没有方法来创建数据类型映射
Additionally, is there any way to generalize mappings in a way that all integers in the target are parsed with that function? In other words, is there a way to create mappings for data types?
编辑：
这看起来很有希望
AutoMapper.Mapper.CreateMap<string, int>()
.ConvertUsing(src => Convert.ToInt32(src));
编辑：
这样的是真正有用的。
推荐答案
最后我做这样的事情：
Mapper.CreateMap<string, int>().ConvertUsing<IntTypeConverter>();
Mapper.CreateMap<string, int?>().ConvertUsing<NullIntTypeConverter>();
Mapper.CreateMap<string, decimal?>().ConvertUsing<NullDecimalTypeConverter>();
Mapper.CreateMap<string, decimal>().ConvertUsing<DecimalTypeConverter>();
Mapper.CreateMap<string, bool?>().ConvertUsing<NullBooleanTypeConverter>();
Mapper.CreateMap<string, bool>().ConvertUsing<BooleanTypeConverter>();
Mapper.CreateMap<string, Int64?>().ConvertUsing<NullInt64TypeConverter>();
Mapper.CreateMap<string, Int64>().ConvertUsing<Int64TypeConverter>();
Mapper.CreateMap<string, DateTime?>().ConvertUsing<NullDateTimeTypeConverter>();
Mapper.CreateMap<string, DateTime>().ConvertUsing<DateTimeTypeConverter>();
Mapper.CreateMap<SourceClass, DestClass>();
Mapper.Map(mySourceObject, myDestinationObject);
和它引用的类（初稿）：
And the classes it references (first draft):
// TODO: Boil down to two with Generics if possible
#region AutoMapTypeConverters
// Automap type converter definitions for
// int, int?, decimal, decimal?, bool, bool?, Int64, Int64?, DateTime
// Automapper string to int?
private class NullIntTypeConverter : TypeConverter<string, int?>
{ protected override int? ConvertCore(string source)
{ if (source == null)
return null;
else
{ int result;
return Int32.TryParse(source, out result) ? (int?) result : null;
} } }
// Automapper string to int
private class IntTypeConverter : TypeConverter<string, int>
{ protected override int ConvertCore(string source)
{ if (source == null)
throw new MappingException("null string value cannot convert to non-nullable return type.");
else
return Int32.Parse(source);
} }
// Automapper string to decimal?
private class NullDecimalTypeConverter : TypeConverter<string, decimal?>
{ protected override decimal? ConvertCore(string source)
{ if (source == null)
return null;
else
{ decimal result;
return Decimal.TryParse(source, out result) ? (decimal?) result : null;
} } }
// Automapper string to decimal
private class DecimalTypeConverter : TypeConverter<string, decimal>
{ protected override decimal ConvertCore(string source)
{ if (source == null)
throw new MappingException("null string value cannot convert to non-nullable return type.");
else
return Decimal.Parse(source);
} }
// Automapper string to bool?
private class NullBooleanTypeConverter : TypeConverter<string, bool?>
{ protected override bool? ConvertCore(string source)
{ if (source == null)
return null;
else
{ bool result;
return Boolean.TryParse(source, out result) ? (bool?) result : null;
} } }
// Automapper string to bool
private class BooleanTypeConverter : TypeConverter<string, bool>
{ protected override bool ConvertCore(string source)
{ if (source == null)
throw new MappingException("null string value cannot convert to non-nullable return type.");
else
return Boolean.Parse(source);
} }
// Automapper string to Int64?
private class NullInt64TypeConverter : TypeConverter<string, Int64?>
{ protected override Int64? ConvertCore(string source)
{ if (source == null)
return null;
else
{ Int64 result;
return Int64.TryParse(source, out result) ? (Int64?)result : null;
} } }
// Automapper string to Int64
private class Int64TypeConverter : TypeConverter<string, Int64>
{ protected override Int64 ConvertCore(string source)
{ if (source == null)
throw new MappingException("null string value cannot convert to non-nullable return type.");
else
return Int64.Parse(source);
} }
// Automapper string to DateTime?
// In our case, the datetime will be a JSON2.org datetime
// Example: "/Date(1288296203190)/"
private class NullDateTimeTypeConverter : TypeConverter<string, DateTime?>
{ protected override DateTime? ConvertCore(string source)
{ if (source == null)
return null;
else
{ DateTime result;
return DateTime.TryParse(source, out result) ? (DateTime?) result : null;
} } }
// Automapper string to DateTime
private class DateTimeTypeConverter : TypeConverter<string, DateTime>
{ protected override DateTime ConvertCore(string source)
{ if (source == null)
throw new MappingException("null string value cannot convert to non-nullable return type.");
else
return DateTime.Parse(source);
} }
#endregion
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