I have a simple LINQ Extension Method...

    public static IEnumerable<string> SplitOnLength(this string input, int length)
    {
        int index = 0;
        while (index < input.Length)
        {
            if (index + length < input.Length)
                yield return input.Substring(index, length);
            else
                yield return input.Substring(index);

            index += length;
        }
    }

This takes a string, and it chops it up into a collection of strings that do not exceed the given length.

This works well - however I'd like to go further. It chops words in half. I don't need it to understand anything complicated, I just want it to be able to chop a string off 'early' if cutting it at the length would be cutting in the middle of text (basically anything that isn't whitespace).

However I suck at LINQ, so I was wondering if anyone had an idea on how to go about this. I know what I am trying to do, but I'm not sure how to approach it.

So let's say I have the following text.

This is a sample block of text that I would pass through the string splitter.

I call this method SplitOnLength(6) I would get the following.

• This i
• s a sa
• mple b
• lock o
• f text
• that I
• would
• pass t
• hrough
• the s
• tring
• splitt
• er.

I would rather it be smart enough to stop and look more like ..

• This
• is a
• sample

// bad example, since the single word exceeds maximum length, but the length would be larger numbers in real scenarios, closer to 200.

Can anyone help me?