CODEWITHSUNDEEP
c#.netdictionary
user1552075
user1552075

Reputation:

Dictionary to Custom KeyValuePair list - can't convert (C# .Net 4.0)

I read that dictionary and KeyValuePair can not be written by the xml serializer. So I wrote my own KeyValuePair struct.

public struct CustomKeyValuePair<Tkey, tValue>
{
   public Tkey Key { get; set; }
   public tValue Value { get; set; }

   public CustomKeyValuePair(Tkey key,tValue value) : this()
   {
      this.Key = key;
      this.Value = value; 
   }
}

But when I do this, I get an error, that it can't convert:

List<CustomKeyValuePair<string, AnimationPath>> convList = 
                   Templates.ToList<CustomKeyValuePair<string, AnimationPath>>();

It works on the normal keyValuePair, but not on my custom one. So whats the problem? I tried to copy the original as close as possible, but it doesn't want to convert my dictionary (Templates) to that list. I can't see that it uses any interface or inherits from a struct to do that. Do I have to add all the entries manually?

Upvotes: 0

Views: 2115

Answers (1)

JLRishe
JLRishe

Reputation: 101652

Dictionary<Tkey, TValue> implements both IEnumerable<KeyValuePair<Tkey, Tvalue>> and ICollection<KeyValuePair<Tkey, Tvalue>>:

(from metadata shown in Visual Studio):

public class Dictionary<TKey, TValue> : IDictionary<TKey, TValue>, 
     ICollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, 
     IDictionary, ICollection, IEnumerable, ISerializable, IDeserializationCallback

That's why ToList() with KeyValuePair works and the other doesn't.

Your best bet is probably to use:

List<CustomKeyValuePair<string, AnimationPath>> convList = 
    Templates.Select(kv => new CustomKeyValuePair(kv.Key, kv.Value)).ToList();

Upvotes: 5

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