I am getting the following exception when I try to call Mapper.Map in my application:
AutoMapper.AutoMapperMappingException.
Mapping types:
Double -> Double
System.Double -> System.Double
Destination path:
Address.Latitude
Source value:
42.250287
System.InvalidCastException. Unable to cast object of type 'Acme.Order' to type 'Acme.Address'.
Aside from the obvious frustration with an error indicating that it can't map objects of the same type (and primitive types at that), the fact is that I NEVER map from type "Acme.Order" to type "Acme.Address"!
Here is the actual call being used:
var order = Mapper.Map<IDataRecord, Order>(theDataReader);
My object model looks like this:
public class Order
{
public Address Address { get; set; }
public Int32 Number { get; set; }
public PhoneNumber PhoneNumber { get; set; }
}
public class Address
{
public String City { get; set; }
public Double Latitude { get; set; }
public Double Longitude { get; set; }
public Int32 Number { get; set; }
public String PostalCode { get; set; }
public String State { get; set; }
public String Street { get; set; }
}
public class PhoneNumber
{
public String Extension { get; set; }
public String Number { get; set; }
}
And I have the following configuration defined in my application:
CreateMap<IDataRecord, Address>()
.ForMember(target => target.Latitude, opt => opt.MapFrom(record => GetDoubleFrom(record, "Latitude", 0)))
.ForMember(target => target.Longitude, opt => opt.MapFrom(record => GetDoubleFrom(record, "Longitude", 0)))
;
CreateMap<IDataRecord, PhoneNumber>()
.ForMember(target => target.Extension, opt => opt.MapFrom(record => GetStringFrom(record, "Extension", String.Empty)))
.ForMember(target => target.Number, opt => opt.MapFrom(record => GetStringFrom(record, "PhoneNumber", String.Empty)))
;
CreateMap<IDataRecord, Order>()
.ForMember(target => target.Address, opt => opt.ResolveUsing(record => Mapper.Map<IDataRecord, Address>(record)))
.ForMember(target => target.PhoneNumber, opt => opt.ResolveUsing(record => Mapper.Map<IDataRecord, PhoneNumber>(record)))
;
With these helper methods:
private Double GetDoubleFrom(IDataRecord record, String name, Double defaultValue)
{
return (record.Contains(name) && !record.IsDbNull(name)) ? record.GetDouble(name) : defaultValue;
}
private String GetStringFrom(IDataRecord record, String name, String defaultValue)
{
return (record.Contains(name) && !record.IsDbNull(name)) ? record.GetString(name) : defaultValue;
}
(I have extension methods on IDataRecord that take the field name, get the ordinal and return the value using the standard methods but won't show them for brevity.)
Does any of this shed any light on what is causing the failure?
(Btw, I am using AutoMapper v2.1.267)
