CODEWITHSUNDEEP
c#linqlambda
Leonardo
Leonardo

Reputation: 11389

transform value of Dictionary using lambda

I have 2 collections in play here:

the thing here is that the cache has the full version of the privilege (along with the id, a friendly description, a text explanation, etc...) and I need to convert the Dictionary<Workflow, List<enumPrivilege>> to Dictionary<Workflow, List<Privilege>>...

Can I do that using a single lambda?

Upvotes: 1

Views: 1012

Answers (1)

Ivan Yonkov
Ivan Yonkov

Reputation: 7034

Depends if you have logic that transforms a single enumeration value to the respective object, e.g. a factory.

In order to transform one Dictionary<K, List<V>> you can use the ToDictionary() method which accepts the KeyValuePair two times, so you can use it first time for the key and second time for the value

Let's say we have

 Dictionary<string, List<string>> a = new Dictionary<string, List<string>>();

And want to transform it to Dictionary b which is string, List<int>

Dictionary<string, List<int>> b 
    = a.ToDictionary(
        kvp => kvp.Key, 
        kvp => kvp.Value.Select(int.Parse).ToList()
    );

The same way you should be able to turn the enumeration to object, by mapping (Select) each enum value and execute the factory upon it

Dictionary<Workflow, List<Privilege>> b 
    = a.ToDictionary(
        kvp => kvp.Key, 
        kvp => kvp.Value.Select(PrivilegeFactory.Create).ToList()
    );

Or if the dictionary's key int is the enumPrivile value you can do

Dictionary<Workflow, List<Privilege>> b 
    = a.ToDictionary(
        kvp => kvp.Key, 
        kvp => kvp.Value.Select(t => cacheDictionary[(int)t])
    );

Upvotes: 4

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