| [Overview][Constants][Types][Classes][Procedures and functions][Variables] | Reference for unit 'Classes' (#rtl) |
Start an update batch.
Source position: classesh.inc line 412
public procedure TCollection.BeginUpdate; virtual; |
BeginUpdate is called at the beginning of a batch update. It raises the update count with 1.
Call BeginUpdate at the beginning of a series of operations that will change the state of the collection. This will avoid the call to TCollection.Update for each operation. At the end of the operations, a corresponding call to EndUpdate must be made. It is best to do this in the context of a Try ... finally block:
With MyCollection Do try BeginUpdate; // Some Lengthy operations finally EndUpdate; end;
This insures that the number of calls to BeginUpdate always matches the number of calls to TCollection.EndUpdate, even in case of an exception.
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Ends an update batch. |
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Procedure called if an item is added to or removed from the collection. |
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Hander called when an item in the collection has changed. |
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