Question

i have this code that take a collection and groups by a string field:

 var groupByIssueType = issues.GroupBy(r => r.IssueType);

i now want to loop through each group but i want to do that in a specify order. something like . .

foreach (var issueType in groupByIssueType)
{
}

The problem is that the order is not alphabetic so i can’t just do an

 OrderBy(r=>r.Name)

or something like that. . . i need a way to sort a grouped collection by its keys but using a custom sorting algorithm

So for example, lets say i have as my IssueTypes

“City Level”
“State Level”
“Country Level”

i want to loop through the “groupbyIssueType collection in the order Country, State, City

what would be the best way of doing that ?

Answer 1

You need to write an IComparer<String> that uses your custom sort order.

For example:

static string[] order = { ... };
public int Compare(string x, string y) {
    return Array.IndexOf(order, x).CompareTo(Array.IndexOf(order, y));
}