只有在屬性中不爲null的情況下，Automapper纔會有多個屬性

Question

我必須從多個屬性返回CallerAddress屬性，就像string.Concat一樣，除非它們不爲null。到目前爲止，我已經嘗試過，但沒有工作。映射後，我的CallerAddress等於「Str。SomeStreetName」。我已經在我的數據庫中查了一下，並且我在其他colums上有價值。那麼，我該如何讓這個工作？

Mapper.CreateMap<ClientRecordingsDao,ClientRecording>() 
    .ForMember(x => x.CallerAddress, 
         b => 
          b.MapFrom(
           x => x.CallerStreet != String.Empty 
            ? "Str." + x.CallerStreet 
            : String.Empty + 
             x.CallerStreetNumber != String.Empty 
             ? " Nr." 
             : String.Empty + x.CallerStreetNumber + 
              x.CallerBuilding != String.Empty 
              ? " Bl." 
              : String.Empty + x.CallerBuilding + 
               x.CallerApartment != String.Empty 
               ? " Ap." 
               : String.Empty + x.CallerApartment)) 

Answer 1

它適用於+ opertator錯誤的地方。總結你的每一個在()比較：

Mapper.CreateMap<ClientRecordingsDao,ClientRecording>() 
    .ForMember(x => x.CallerAddress, b => b.MapFrom(
     x => (x.CallerStreet != String.Empty ? "Str." + x.CallerStreet : String.Empty) + 
      (x.CallerStreetNumber != String.Empty ? " Nr." + x.CallerStreetNumber : String.Empty) + 
      (x.CallerBuilding != String.Empty ? " Bl." + x.CallerBuilding : String.Empty) + 
      (x.CallerApartment != String.Empty ? " Ap." + x.CallerApartment : String.Empty))); 

您的代碼映射到這一點：

Mapper.CreateMap<ClientRecordingsDao,ClientRecording>() 
    .ForMember(x => x.CallerAddress, b => b.MapFrom(
     x => x.CallerStreet != String.Empty ? "Str." + x.CallerStreet : 
     (String.Empty + x.CallerStreetNumber != String.Empty ? " Nr." + x.CallerStreetNumber : 
     (String.Empty + x.CallerBuilding != String.Empty ? " Bl." + x.CallerBuilding : 
     (String.Empty + x.CallerApartment != String.Empty ? " Ap." + x.CallerApartment : String.Empty)))));