[Mono-bugs] [Bug 572874] New: ValueType.Equals fails on structs containing nullables

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Thu Jan 21 21:37:17 EST 2010



           Summary: ValueType.Equals fails on structs containing nullables
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: All
        OS/Version: Windows Vista
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: CORLIB
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: tagdev at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

Created an attachment (id=338176)
 --> (http://bugzilla.novell.com/attachment.cgi?id=338176)
Patch to apply to the trunk, which adds a test for this bug.

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:
Gecko/20090824 Firefox/3.5.3 GTB6 (.NET CLR 3.5.30729)

When comparing struct data that are exact copies of each other, the result
would incorrectly indicate that they are different if any nullable data-type is
part of of the data structure's definition.

Reproducible: Always

Steps to Reproduce:
1. Define a struct data-type that contain a nullable type, e.g., Nullable<int>
2. Create two instances of the defined struct, for example named x and y, and
populate both with the exact same data
3. Compare the two instances using x.Equals(y), which would use
ValueType.Equals for the comparison
Actual Results:  
False is returned from ValueType.Equals

Expected Results:  
ValueType.Equals must return true in this case

This bug is not specific to Windows, but was detected on openSUSE 11.1 as well.

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