XRObservableCollection.RemoveItemImpl(int) (Compact 7)
3/12/2014
This protected method implements collection operations for removing items from the data source collection and invokes XRObservableCollection.OnCollectionChanged(XRCollectionChangedCustomEventArgs *) to send an event notification that the collection has changed.
Syntax
HRESULT STDMETHODCALLTYPE RemoveItemImpl(
int nIndex)
Parameters
- nIndex
[in] The index of the item in the collection to remove.
Return Value
The following table shows the possible return values.
| Value | Description |
|---|---|
S_OK |
The method was successful. |
E_FAIL |
The method was unsuccessful. |
E_BUSY |
The collection is currently being updated. |
E_OUTOFMEMORY |
The method exceeded its available memory. |
E_POINTER |
The method cannot access the item to remove. |
The E_OUTOFMEMORY value is returned when the system does not have enough memory to create an internal instance of the collection object.
The E_OUTOFMEMORY and E_FAIL values are returned in two different situations:
- E_OUTOFMEMORY is returned if the method was able to process the input parameter for the internal call to create an instance; however, the method was unable to create the instance by using the input parameter.
- E_FAIL is returned by the method’s internal call to create an instance if none of its
ifstatements were evaluated by the method. When E_FAIL is returned, none of the code in the internal call to create an instance was processed.
Remarks
The inherited method XRValueCollectionT.Remove(const ItemType&) internally calls the RemoveItemsImpl method to execute the functionality to remove items from the data source collection. You can override this method to provide a customized implementation of removing items from the collection.
Because XRObservableCollection.RemoveItemImpl is a protected member, an instance of XRObservableCollection<ItemType> cannot directly access the XRObservableCollection.RemoveItemImpl method.
If you derive a new class from XRObservableCollection<ItemType> that uses either public or protected access modifiers, you can override this method in the new class.
Requirements
Header |
XRCollection.h |