Automapper：將字符串轉換爲數據集的日期時間

Question

我使用automapper將數據集映射到我創建的對象的IEnumerable。

我有一個數據集，看起來像（testcode）：

class Program 
{ 
    static void Main(string[] args) 
    { 
     Mapper.CreateMap<string, DateTimeOffset>().ConvertUsing<StringToDateTimeOffsetConverter>(); 
     Mapper.CreateMap<string, DateTime>().ConvertUsing<StringToDateTimeConverter>(); 
     Mapper.CreateMap<IDataReader, SentMessageListItem>() 
       .ForMember(dest => dest.SentDate, opt => opt.MapFrom(src => src.GetString(2))) 
       .ForMember(dest => dest.DeleteDate, opt => opt.MapFrom(src => src.GetString(3))); 

     var sentmessages = Mapper.Map<IDataReader, IEnumerable<SentMessageListItem>>(Model.DataSet.CreateDataReader()); 
    } 
} 

public class SentMessageListItem 
{ 
    public virtual int Id { get; set; } 
    public virtual string Subject { get; set; } 
    public virtual DateTimeOffset SentDate { get; set; } 
    public virtual DateTime DeleteDate { get; set; } 
} 

internal class StringToDateTimeOffsetConverter : ITypeConverter<string, DateTimeOffset> 
{ 
    public DateTimeOffset Convert(ResolutionContext context) 
    { 
     var objDateTime = context.SourceValue; 
     DateTimeOffset dateTime; 

     if (objDateTime == null) 
     { 
      return default(DateTimeOffset); 
     } 

     if (DateTimeOffset.TryParse(objDateTime.ToString(), out dateTime)) 
     { 
      return dateTime; 
     } 

     return default(DateTimeOffset); 
    } 
} 

internal class StringToDateTimeConverter : ITypeConverter<string, DateTime> 
{ 
    public DateTime Convert(ResolutionContext context) 
    { 
     var objDateTime = context.SourceValue; 
     DateTime dateTime; 

     if (objDateTime == null) 
     { 
      return default(DateTime); 
     } 

     if (DateTime.TryParse(objDateTime.ToString(), out dateTime)) 
     { 
      return dateTime; 
     } 

     return default(DateTime); 
    } 
} 

public static class Model 
{ 
    public static readonly DataSet DataSet = GetDataSet(); 

    private static DataSet GetDataSet() 
    { 
     var set = new DataSet(); 
     var table1 = new DataTable(); 
     table1.Columns.Add("id"); 
     table1.Columns.Add("subject"); 
     table1.Columns.Add("sentdate"); 
     table1.Columns.Add("deletedate"); 
     table1.Rows.Add("0", "Subject", "01/01/2013", "01/01/2013"); 
     set.Tables.Add(table1); 

     return set; 
    } 
} 

錯誤：

Mapping types: 
IDataReader -> IEnumerable`1 
System.Data.IDataReader -> System.Collections.Generic.IEnumerable`1[[CNH.CSCN.BBS.Entities.Domain.Entities.SentMessageListItem, CNH.CSCN.BBS.Entities, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] 

Destination path: 
IEnumerable`1 

Source value: 
System.Data.DataTableReader 

我到底做錯了什麼？

該錯誤是由datetimeoffset和datetime引起的，因爲如果我刪除它們，automapper將映射我的數據集到我的對象沒有問題。

Answer 1

當映射未正確註冊並嘗試使用它時，會發生此錯誤。如果源和目標對象屬性不同，請使用下面的邏輯進行映射。

Mapper.CreateMap<IDataReader, SentMessageListItem>() 
    .ForMember(dest => dest.A, opt => opt.MapFrom(src => src.A)) // A -> A Optional (Both 'A' are same) 
    .ForMember(dest => dest.B, opt => opt.MapFrom(src => src.BB)) // BB -> B 

參考this & this