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Editorial Team
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Asked: 2026-05-23T14:29:29+00:00

So I am working with WCF and my services return types that contain generic

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So I am working with WCF and my services return types that contain generic lists. WCF is currently converting these to arrays over the wire. Is there a way I configure WCF to convert them back to lists afterwards? I know there is a way by clicking advanced when you add a service reference but I am looking for a solution in configuration files or something similar.

[DataContract(IsReference = true)]
public class SampleObject
{
  [DataMember]
  public long ID { get; private set; }

  [DataMember]
  public ICollection<AnotherObject> Objects { get; set; }
}

It is very odd, also, because one service returns it as a list and the other as an array and I am pretty sure they are configured identically.

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1 Answer

  1. Editorial Team

    I found a solution that was much simpler and worked well enough for me, although it might not work for others. I simply switched from using ICollection (IList also produces this result) to List. It worked fine after that.

    Solution from Here.

    I also found a possible configuration solution from Here near the bottom.

    <CollectionMappings>
    <CollectionMapping TypeName="ChangeTracker.ChangeTrackingCollection'1" Category="List" />
</CollectionMappings>
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