CODEWITHSUNDEEP
c#automapper
Mady
Mady

Reputation: 459

Empty string to nullable type conversion using Automapper 3.0?

I'm trying to convert properties on source object of strings to destination object properties of nullable datatypes(int?,bool?,DateTime?). properties of type string on my source can be empty and when they are empty an equivalent null should be mapped on destination property.It works fine when property has value but when it is empty It throws an exception {"String was not recognized as a valid Boolean."}

public class SourceTestString
{
  public string IsEmptyString {get; set;}
}

public class DestinationTestBool
{
  public bool? IsEmptyString {get; set;}
}

My Converter class

public class StringToNullableBooleanConverter : ITypeConverter<string,bool?>
 {
     public bool? Convert(ResolutionContext context) 
     {
        if(String.IsNullOrEmpty(System.Convert.ToString(context.SourceValue)) ||  String.IsNullOrWhiteSpace(System.Convert.ToString(context.SourceValue)))
         {
            return default(bool?);
         }
         else
         {
            return bool.Parse(context.SourceValue.ToString()); 
         }
      }
  }

Create Map 

AutoMapper.Mapper.CreateMap<string,bool?>().ConvertUsing(new StringToNullableBooleanConverter());

Map Method

SourceTestString source = SourceTestString();
source.IsEmptyString = ""; 
var destination = Mapper.Map<SourceTestString,DestinationTestBool>(source);

Upvotes: 0

Views: 1912

Answers (2)

Mady
Mady

Reputation: 459

Actually, The Code in my question working perfectly. It was one of my properties which was bool instead of bool? and I apologize for that and thanks for one and all for participation.

Upvotes: 1

Alex Filipovici
Alex Filipovici

Reputation: 32541

Try this:

public class StringToNullableBooleanConverter : 
    ITypeConverter<string, bool?>
{
    public bool? Convert(ResolutionContext context)
    {
        if (String.IsNullOrEmpty(System.Convert.ToString(context.SourceValue)) 
            || String.IsNullOrWhiteSpace(System.Convert.ToString(context.SourceValue)))
        {
            return default(bool?);
        }
        else
        {
            bool? boolValue=null;
            bool evalBool;
            if (bool.TryParse(context.SourceValue.ToString(), out evalBool))
            {
                boolValue = evalBool;
            }
            return boolValue;
        }
    }
}

Upvotes: 0

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