String.CompareTo() returns unexpected value

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While comparing two strings for sorting using string.CompareTo(), unexpected result comes.

Paste below code in the main method.

C#

String str9 = "Output 9";
String str11 = "Output 11";

int nine_11 = str9.CompareTo(str11);

The value returned is one(1) means str9 is greater than str11. However, I was expecting it to be -1.

Any idea to overcome this.

Posted 23-Oct-13 23:30pm

Praveen Raghuvanshi

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Richard MacCutchan 24-Oct-13 5:39am

The character '9' is greater than the character '1'. See http://alasir.com/books/bsd/appendix-f.html.

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CPallini · Accepted Answer · 2013-10-23T23:45:00

That is correct, it is called lexicographic comparison. As Richard pointed out, the character '1' is less than character '9'.
What you (possibly) expected was a combined compare, that is lexicographic on the heading strings (that is "Output ") and numeric on the trailing ones ( "9", "11"). That is not automatic you have to write yourself some (simple) code.