从集合映射到数组

Question

Hi I looked and only saw examples from arrays to list\\collection but not the other way around.

I have a collection with an attribute AccIndex that I want to map to an array with an attribue named AccIndex .

I tried the following:

Mapper.CreateMap<AccountCollection, AcctArray[]>().
    ForMember(d=> d.AccIndex, 
         o=>MapFrom(s => s.AcctList.Select(c => c.AccIndex).ToArray()));

This gives me null , and with the toArray I feel it will only make everything slower (toArray and than breaking it up again).

Isn't there a simple way to map between the two? The only difference is that one is a collection and the other array but somehow I find nothing on google.

Some more stuff I tried that always resulted with many nulls:

Mapper.CreateMap<AccountCollection,
    AcctArray>();
Mapper.Map(AcctIndexesList, newIndexesArray);

Mapper.CreateMap<AccountCollection, 
    AcctArray[]>();
Mapper.Map(AcctIndexesList, newIndexesArray2);

I was asked to show how the collection and array look like so:

public class AccountCollection: IList, ICollection, IList<AcctIndexes>,     
 ICollection<AcctIndexes>, IEnumerable<AcctIndexes>, IEnumerable {

public AcctIndexesCollection();
public virtual int Count { get; }
public int Rows { get; set; }
public virtual AcctIndexes this[int index] { get; set; }
public virtual int Add(AcctIndexes value);
 ...
}

public class AcctIndexes : IFormattable
{
    public bool AccIndexSpecified;
    public AcctIndexes();

    public int AccIndex { get; set; }
}

And an array of these:

public partial class AcctArray {
  private int accIndexField;    
  public int AccIndex 
  {
     get {
           return this.accIndexField;
         }
     set {
           this.accIndexField = value;
         }
   }
}

Thanks

Answer 1

Ok I fixed my problem. My problem was I didn't use the mapper correctly. On the "CreateMapper" U need to put only the core items, and on the "Mapper.Map" u need to put only the generic collection of them. In my case:

Mapper.CreateMap<AcctIndexes, AcctIndexes>();
Mapper.Map<ICollection<AcctIndexes>, AcctIndexes[]>();