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Article ID: 905718 - Last Review: December 3, 2007 - Revision: 1.4
BUG: An InvalidOperationException exception may not be returned when you modify a collection in the .NET Framework
SYMPTOMS
In the Microsoft .NET Framework, when you modify a collection by using a statement such as the
foreach statement, an
InvalidOperationException exception may not be returned as you expect. Instead, a null value may be returned.
Note The enumerator is still irrecoverably invalidated when this problem occurs.
STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
An enumerator remains valid as long as the collection remains unchanged. Changes to a collection that invalidate the enumerator are adding elements, modifying elements, and deleting elements. After you invalidate the enumerator, the next call to the
MoveNext method or to the
Reset method should return an
InvalidOperationException exception. However, the next call to the
MoveNext method or to the
Reset method does not always return an
InvalidOperationException exception.
If you modify the collection between calling the
MoveNext method and calling the
Get function on the
Current property, the
Get function returns the element that the
Current property is set to. The
Get function returns this
Current property even if the enumerator is already invalidated.
REFERENCES
For more information about how to enumerate a collection, visit the following Microsoft Developer Network (MSDN) Web site:
For more information about the
IEnumerator interface, visit the following MSDN Web site:
APPLIES TO
- Microsoft .NET Framework 2.0
- Microsoft .NET Framework 1.1
- Microsoft .NET Framework 1.0
| kbtshoot kbbug kbnofix kbwindowsforms KB905718 |
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