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c#icomparerstartswith

IComparer for string that checks if x starts with y

I've got an array of strings and I need to get all strings, that start with some 'prefix'. I wanna use Array.BinarySearch(). Is it possible? And how should I write a comparer if so?

Solution

  • No, you cannot use BinarySearch in this case. You could use Enumerable.Where instead:

    Dim query = From str In array Where str.StartsWith("prefix")

    or with (ugly in VB.NET) method synatx:

    query = array.Where(Function(str) str.StartsWith("prefix"))

    Edit: whoops, C#

    var query = array.Where(s => s.StartsWith("prefix"));

    Use ToArray if you want to create a new filtered array.