[Mono-bugs] [Bug 436328] New: Sorting a ComboBox with Custom Items: Invalid Operation Exception

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https://bugzilla.novell.com/show_bug.cgi?id=436328


           Summary: Sorting a ComboBox with Custom Items: Invalid Operation
                    Exception
           Product: Mono: Class Libraries
           Version: 2.0
          Platform: Other
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: lnc19 at hotmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


When sorting a ComboBox i'm getting:


Unhandled Exception: System.InvalidOperationException: The comparer threw an
exception. ---> System.InvalidOperationException: No IComparable or
IComparable<T> interface found for type 'System.Object'.
  at System.Array.compare[Object] (System.Object value1, System.Object value2,
IComparer`1 comparer) [0x0008e] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/corlib/System/Array.cs:1727 
  at System.Array.qsort[Object,Object] (System.Object[] keys, System.Object[]
items, Int32 low0, Int32 high0, IComparer`1 comparer) [0x00025] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/corlib/System/Array.cs:1693 
  at System.Array.Sort[Object,Object] (System.Object[] keys, System.Object[]
items, Int32 index, Int32 length, IComparer`1 comparer) [0x000df] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/corlib/System/Array.cs:1646 
  --- End of inner exception stack trace ---
  at System.Array.Sort[Object,Object] (System.Object[] keys, System.Object[]
items, Int32 index, Int32 length, IComparer`1 comparer) [0x000f0] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/corlib/System/Array.cs:1649 
  at System.Array.Sort[Object] (System.Object[] array, Int32 index, Int32
length) [0x00011] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/corlib/System/Array.cs:1580 
  at System.Collections.ArrayList.Sort () [0x00000] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/corlib/System.Collections/ArrayList.cs:3180 
  at System.Windows.Forms.ComboBox+ObjectCollection.Sort () [0x00000] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/Managed.Windows.Forms/System.Windows.Forms/ComboBox.cs:2127 
  at System.Windows.Forms.ComboBox.set_Sorted (Boolean value) [0x00026] in
/home/luciano/mono_opt20/mono-2.0/mcs/class/Managed.Windows.Forms/System.Windows.Forms/ComboBox.cs:777 
  at (wrapper remoting-invoke-with-check)
System.Windows.Forms.ComboBox:set_Sorted (bool)
  at TestBugWinForms.TestForm..ctor () [0x00000] 
  at (wrapper remoting-invoke-with-check) TestBugWinForms.TestForm:.ctor ()
  at TestBugWinForms.MainClass.Main () [0x00000] 



THE comboBox has items which are "Structs" beacause i need some Custom
Information on each items. 
This is working on Microsoft .NET Environment.

The code to reproduce this error:


using System;
using System.Windows.Forms;
namespace TestBugWinForms
{


        public class MainClass
        {


                public static void Main ()
                {
                        Application.Run (new TestForm ());

                }                       

        }
}


using System;
using System.Windows.Forms;

namespace TestBugWinForms
{
        public struct ComboVal {
                public string value;
                public string text;
                public string MyOtherValue;

                public ComboVal (string v, string t, string o)
                {
                        value = v;
                        text = t;
                        MyOtherValue = o;
                }
                // This override is for the Text shown in the ComboBox.
                public override string ToString()
                {
                        return text;
                }

        }

        public class TestForm:Form
        {

                public TestForm()
                {
                        ComboBox cmb = new ComboBox ();
                        // I add some Structs to the ComboBox (This is valid on
Microsoft Framework, i guess it is the only way to get more than one value on
the ComboBox Item.
                        cmb.Items.Add (new ComboVal ("1", "Test2", "Other1"));
                        cmb.Items.Add (new ComboVal ("2", "Test1", "Other2"));
                        this.Controls.Add (cmb);
                        cmb.Sorted = true; // Here it is the error.
                }
        }
}


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