如何使用反射将一种类型转换为另一种类型? [英] How to convert one type to another using reflection?

问题描述

我有两种非常相似的类型(即成员名称非常相似).

I have a two types that are very similar (i.e. the member names are very similar).

是否有一种优雅的方法可以将一种类型复制到另一种类型，而不必手动复制每个成员?

Is there an elegant way to copy one type to another, without having to copy each individual member by hand?

更新

以下是一些示例源代码:

Here is some sample source code:

main()
{
  FromCsvFile x = new FromCsvFile(fileName);
  OptionsEnt y = x.ToOptionsEnt(); // See helper function below.
}

// Chained helper function to convert type "FromCsvFile" to type "OptionsEnt".
// Want to replace this with something more elegant (perhaps with reflection?).
// Notice the corner cases, i.e. the "ExpirationDate" is a special conversion.
public static OptionsEnt ToOptionsEnt(this FromCsvFile fromCsvFile)
{
  return new OptionsEnt
           {
             Last = fromCsvFile.Last,
             Ask = fromCsvFile.Ask,
             Bid = fromCsvFile.Bid,
             Delta = fromCsvFile.Delta,
             EODsnapshotNewYorkTime = fromCsvFile.EODsnapshotNewYorkTime,
             Exchange = fromCsvFile.Exchange,
             ExpirationDate = fromCsvFile.Expiration.ToTypeIceDate(),
             Gamma = fromCsvFile.Gamma,
             IV = fromCsvFile.IV,
             LastDate = fromCsvFile.Date.ToTypeIceDate(),
             AdjustedStockClose = fromCsvFile.AdjustedStockClose,
             MeanPrice = fromCsvFile.MeanPrice,
             OptionType = fromCsvFile.OptionType == "C" ? OptionTypeEnum.enCall : OptionTypeEnum.enPut,
             OpenInterest = fromCsvFile.OpenInterest,
             Rho = fromCsvFile.Rho,
             StockSymbol = fromCsvFile.SymbolStock,
             StrikePrice = fromCsvFile.StrikePrice,
             Symbol = fromCsvFile.Symbol,
             StockPriceForIV = fromCsvFile.StockPriceForIV,
             Star = fromCsvFile.Star,
             Theta = fromCsvFile.Theta,
             Vega = fromCsvFile.Vega,
             Volume = fromCsvFile.Volume,
             IVnotInterpolated = fromCsvFile.IVnotInterpolated
          };
}

更新

决定使用AutoMapper.

Decided to go with AutoMapper.

以下代码代替了上面代码的 all (假设所有成员名称和名称均相同):

Here is the code that replaces all of the code above (assuming that all member names are of the same name and type):

main()
{
  FromCsvFile x = new FromCsvFile(fileName);
  OptionsEnt y = Mapper.Map<FromCsvFile, OptionsEnt>(x);
}

由于我们需要一些自定义转换器(即DateTime >> IceDateTime)，因此这是额外的代码行，其中包括参数"ExpirationDate"的自定义映射.添加此行可避免引发异常，因为它不知道如何将日期从一种格式转换为另一种格式.

As we need some custom converters (i.e. DateTime >> IceDateTime), here is the extra line of code that includes a custom mapping for the parameter "ExpirationDate". Adding this line avoids an exception being thrown as it doesn't know how to convert dates from one format to another.

 Mapper.CreateMap<DateTime, typeIceDate>().ConvertUsing(ConverterIceTypeIceDate.ToTypeIceDate);

推荐答案

也许 Automapper ?

例如:

Mapper.CreateMap<FromCsvFile, OptionsEnt >();
return Mapper.Map<FromCsvFile, OptionsEnt>(fromCsvFile);

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