CODEWITHSUNDEEP
c#
Ufo
Ufo

Reputation: 9

convert an List<Keyvaluepair> to a specific ICollection type C#

`Please am new-bee to programming and also have searched for the last few hours on a solution but cant find one; So here is my problem:

I have a List<KeyValuePair<string, object>> I want to convert the value pair at run-time to a ICollection<T>

Where T is the Type of object (The Value pair).

The purpose of the conversion is to pass the values into the PropertyInfo.SetValue(obj, val) method. Where val is the ICollection

public object TheMEthod( object objreactor, List<KeyValuePair<string, object>> objactor) {

  Type tyr2 = typeof(List<>).MakeGenericType(objactor.First().Value.GetType());

  ICollection list = (ICollection) Activator.CreateInstance(tyr2);
  list = (ICollection) objactor.Select(l => l.Value).Distinct().ToList();

                objreactor.GetType().GetProperty(objactor.First().Key)?.SetValue(objreactor, Convert.ChangeType( list, objactor.First().Value.GetType()), null);

            //else return exception

            return objreactor;


        }

This returns the error object must implement iconvertible c#"

Upvotes: 0

Views: 404

Answers (1)

Jamiec
Jamiec

Reputation: 136174

If the keyvalue pair has an object as the value, but you need it to be a specific object T you'll need to cast it. This will only work if the Value really is the right type.

List<KeyValuePair<string, object>> list = ....

ICollection<TheRealObject> coll = list.Select(x => x.Value)  // Select the Values
                                      .Cast<TheRealObject>() //Cast them to your type
                                      .ToList(); // turn it to a list

Note that List<T> is a ICollection<T> so you can almost certainly pass this list to a SetProperty expecting an ICollection<T>

Upvotes: 2

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