All C# extension methods for type ienumerable-string
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Flatten
Flatten an IEnumerable<string>
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PathCombine
Combines an IEnumerable<string> using Path.Combine(), which will use the separator character that is correct for the platform used. It is a shorter and more correct way to combine paths than just using + "\\" + . Requires "using System.IO;" at the top of your extension method class.
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IEnumerable(string).Join
Joins a series of strings connected by a separator.