Are immutable arrays possible in .NET?

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The Framework Design Guidelines suggest returning a copy of the Array. That way, consumers can’t change items from the array.

// bad code
// could still do Path.InvalidPathChars[0] = 'A';
public sealed class Path {
   public static readonly char[] InvalidPathChars = 
      { '\"', '<', '>', '|' };
}

these are better:

public static ReadOnlyCollection<char> GetInvalidPathChars(){
   return Array.AsReadOnly(InvalidPathChars);
}

public static char[] GetInvalidPathChars(){
   return (char[])InvalidPathChars.Clone();
}

The examples are straight from the book.

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