LINQ group by enum and map to another enum

Dear Experts:
I need to group a list of customers (List<Customer>) where Customer contains this enum

public enum CustomerType

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to a new enum
public enum NewCustomerType
  newtype1,  //map to type1
  newtype2,  //map to type2 and 3
  newtype3,  //map to type4 and 5 

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Note: My initial code to map to the first enum:
var sortedDetails = _customers.GroupBy(x => x.CustomerType).ToDictionary(t => t.Key, t => t.ToList());
Your answer should return a dictionary mapped to the new enum.

LVL 37
Miguel OzSoftware EngineerAsked:
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käµfm³d 👽Commented:
What is the point of this code? I get that you want to remap the customer type, but what is the purpose of the GroupBy?
Miguel OzSoftware EngineerAuthor Commented:
If you are refering to the initial code sample is just to show you an initial attempt,. My expectations is that your answer should provide me with a dictionary sorted by the new enum.
käµfm³d 👽Commented:
I would write a mapping function to do the conversion:

static NewCustomerType Map(CustomerType type)
    switch (type)
        case CustomerType.type2:
        case CustomerType.type3:
            return NewCustomerType.newtype2;
        case CustomerType.type4:
        case CustomerType.type5:
            return NewCustomerType.newtype3;
            return NewCustomerType.newtype1;

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...and then you can use that function within the GroupBy:

var sorted = customers.GroupBy(c => Map(c.CustomerType))
                      .ToDictionary(t => t.Key, t => t.ToList());

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Miguel OzSoftware EngineerAuthor Commented:
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