Convert IDictionary to Dictionary

I have to convert System.Collections.Generic.IDictionary<string, decimal> to System.Collections.Generic.Dictionary<string, decimal>, and i can't. I tried the ToDictionar开发者_运维知识库y method and can't specify right arguments.

I've tried the following:

// my dictionary is PlannedSurfaces (of type IDictionary<string, decimal>)
blabla.ToDictionary<string, decimal>(localConstruction.PlannedSurfaces) 

var newDict = new Dictionary<string, decimal>(oldDictionary)

or in linq

var castedDico = dictionary.ToDictionary(kvp => kvp.Key, kvp => kvp.Value);

var newDictionary = (IDictionary<string, boolean>)ex.Data;

IDictionary can be casted as a Dictionary.

Note that if dictionary is empty/null, it will throw exception.