Bug of sorted attribute when ComboBox uses data binding

This bug found when investigating a strange system exception occurs when you select one item in ComboBox,ProgramIn the selectindexchanged event, an error occurs when the user selects to refresh the data. After tracing debugging, it is found that the value of selectedvalue is inconsistent with the selected item.

But why is such a strange error?
After investigation, we found that the ComboBox sorted attribute is set.

Re-testCodeAs follows:

 

1 Private   Void Combobox#selectedindexchanged ( Object Sender, eventargs E)
2 {
3 Datarowview DRV = Combobox1.selecteditem As Datarowview;
4 Label1.text =   String . Format ( " Value: {0 }={ 1 }? " , Combobox1.selectedvalue, DRV. Row [ " ID " ]);
5 }
6
7 Private   Void Frmtest_load ( Object Sender, eventargs E)
8 {
9 Datatable dt =   New Datatable ();
10 DT. Columns. Add ( " ID " , Typeof ( Int ));
11 DT. Columns. Add ( " Name " , Typeof ( String ));
12 DT. Rows. Add ( 1 , " F-1 " );
13 DT. Rows. Add ( 2 , " E-2 " );
14 DT. Rows. Add ( 3 , " D-3 " );
15 DT. Rows. Add ( 4 , " C-4 " );
16 DT. Rows. Add ( 5 , " B-5 " );
17 DT. Rows. Add ( 6 , " A-6 " );
18
19 Combobox1.datasource = DT;
20 Combobox1.valuemember =   " ID " ;
21 Combobox1.displaymember =   " Name " ;
22 }

 

If a-6 is selected in ComboBox, the value of selectedvalue is 1.

In fact, the sorted attribute is set to true. A-6 is shown in the first one, that is, selectedindex is 1.

The test shows that the value of selectedvalue is obtained in the order of row in the original able.

But the value of ID obtained through selecteditem is 6, which is correct. Therefore, the value assignment of selecteditem is correct.

It is estimated that this should be a Microsoft Bug, But it is strange that there are not two errors together, but one is wrong.

Lab environment:

Vs2005 Vista. NET Framework 3.5 SP1 v2.0.50727.3074.

If you have other environments, you can try to see if the same bug exists in the frameworks of other versions.