I have a method that returns an IEnumerable lt KeyValuePair lt string ArrayList gt gt but some of the callers require the result of the method to be a dictionary How can I convert the IEnumerable lt KeyValuePair lt string ArrayList gt gt into a Dictionary lt string ArrayList gt so that I can use TryGetValue method public IEnumerable lt KeyValuePair lt string ArrayList gt gt GetComponents yield return new KeyValuePair lt string ArrayList gt t Name controlInformation caller Dictionary lt string ArrayList gt actual target GetComponents actual ContainsKey something

If you re using NET 3 5 or NET 4 it s easy to create the dictionary using LINQ Dictionary lt string ArrayList gt result target GetComponents ToDictionary x gt x Key x gt x Value There s no such thing as an IEnumerable lt T1 T2 gt but a KeyValuePair lt TKey TValue gt is fine

As of NET Core 2 0 the constructor Dictionary lt TKey TValue gt IEnumerable lt KeyValuePair lt TKey TValue gt gt now exists

[c#] Recreating a Dictionary from an IEnumerable<KeyValuePair<>>

I have a method that returns an IEnumerable<KeyValuePair<string, ArrayList>>, but some of the callers require the result of the method to be a dictionary. How can I convert the IEnumerable<KeyValuePair<string, ArrayList>> into a Dictionary<string, ArrayList> so that I can use TryGetValue?

method:

public IEnumerable<KeyValuePair<string, ArrayList>> GetComponents()
{
  // ...
  yield return new KeyValuePair<string, ArrayList>(t.Name, controlInformation);
}

caller:

Dictionary<string, ArrayList> actual = target.GetComponents();
actual.ContainsKey("something");

This question is related to c# collections dictionary ienumerable idictionary

The answer is

If you're using .NET 3.5 or .NET 4, it's easy to create the dictionary using LINQ:

Dictionary<string, ArrayList> result = target.GetComponents()
                                      .ToDictionary(x => x.Key, x => x.Value);

There's no such thing as an IEnumerable<T1, T2> but a KeyValuePair<TKey, TValue> is fine.

As of .NET Core 2.0, the constructor Dictionary<TKey,TValue>(IEnumerable<KeyValuePair<TKey,TValue>>) now exists.

Source: Stackoverflow.com

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