[Mono-bugs] [Bug 465875] New: System.Core Lookup<TKey, TElement> does not use the specified comparer

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Jan 13 16:16:52 EST 2009


           Summary: System.Core Lookup<TKey,TElement> does not use the
                    specified comparer
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.0.x
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.Core
        AssignedTo: jbevain at novell.com
        ReportedBy: bassam at symform.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

User-Agent:       Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1;
NET CLR 2.0.50727; Media Center PC 5.0; InfoPath.2; .NET CLR 3.5.20706; .NET
CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618)

The IEqualityComparer passed to ToLookup is not honored. This result in the
wrong comparison. It looks like the comparer is not passed to the dictionary
that implements lookup.

We would greatly appreciate a fix for this in 2.2.

Reproducible: Always

Steps to Reproduce:
        private class Color
            public string Name;
            public int Value;

        public void LookupCase()
            Color[] colors = new Color[] 
                new Color() { Name = "red", Value = 0xFF0000 },
                new Color() { Name = "green", Value = 0x00FF00 },
                new Color() { Name = "blue", Value = 0x0000FF },

            Lookup<string, int> lookup = colors.ToLookup(c => c.Name, c =>
c.Value, StringComparer.OrdinalIgnoreCase) as Lookup<string, int>;

            Assert.AreEqual(lookup["Red"].First(), 0xFF0000);

Actual Results:  
KeyNotFoundException thrown.

Expected Results:  
No exception thrown.

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