[Mono-bugs] [Bug 601772] New: String.Split() can return too many substrings

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sun May 2 07:26:53 EDT 2010



           Summary: String.Split() can return too many substrings
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: CORLIB
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: Chuck.Esterbrook at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us)
AppleWebKit/531.22.7 (KHTML, like Gecko) Version/4.0.5 Safari/531.22.7

The docs for String.Split say that the 'count' argument is the "The maximum
number of substrings to return."  See

But at least one of the overloads of Split will return count+1 substrings. Code
in "Steps to Reproduce"

Reproducible: Always

Steps to Reproduce:
// compile and run this program.
// Bug: String.Split() can return an extra substring in violation of the
'count' parameter value passed to it.
// This program
// ... prints "1" and "True" on .NET 3.5 as expected
// ... prints "2" and "False" on Mono 2.6.3 on Linux (and Mono 2.6.1 on Mac OS
X 10.6)
using System;

namespace TestSplit {
    class Program {
        static void Main(string[] args) {
            var maxSubStrings = 1;
            var r = "aoeuXXasdf".Split(new string[] { "XX" }, maxSubStrings,
            Console.WriteLine(r.Length == maxSubStrings);

Actual Results:  

Expected Results:  

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