Convert an object to KeyValuePair

Question

I have an IEnumerable<Entityclass> for an object that has a string and int member. I need to convert it to an array KeyValuePair<string, double> and vice versa.

Failure on error.

 [DataContract] public class Entityclass { [DataMember] public string text{ get; set; } [DataMember] public int textcount{ get; set; } } 

I have an IEnumerable<Entityclass>

• How do I convert from an IEnumerable<Entityclass> to an array KeyvaluePair<string, double>[] ?

• How to convert the array KeyvaluePair<string, double>[] to the array KeyvaluePair<string, int>[] ?

• How to convert KeyValuePair<string, double> back to IEnumerable?

I tried:

• topics is IEnumerable<Entityclass>;
• topics.Cast<KeyValuePair<string, double>>().ToArray(); Error Failure

Answer 1

You need to project each theme in KeyValuePair . The Linq Select extension method does this:

 topics .Select(x=> new KeyValuePair<string, double>(x.text, x.textcount)) .ToArray();