When the Persistence manager is looping through the controls in a page by default it saves all of them. This also means that all the control properties are persisted by default. In a case when you want to persist just some of the properties or want to avoid saving some, you can remove them from the persisted data. The Persistence API provides a class that holds the properties data called pick:[asp-net="* PropertyData*"] . By excluding some of the properties you reduce the size of the persisted data which sometimes is crucial for the available resources.
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Note
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Note:
You also may want to remove properties for security reasons. |
You can remove the unnecessary control properties while handling the pick:[asp-net="* PersistenceSaved*"] event. When you want to remove control from the persisted data, as it is in Exclude Control, the control found by its ID, but when you want to remove just a property you need the property’s name. Therefore you must specify a list of strings that contains the names of the properties to be ignored.
| In C#: |
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protected void PersistenceSaved(object sender, PersistenceEventArgs e)
{
if (e.PersistenceData == null)
{
return;
}
List<string> listIgnoredControlsID = new List<string>() { this.control1.ID };
List<string> listIgnoredPropertiesID = new List<string>() { "prop1", "prop2" };
PersistenceData data = e.PersistenceData;
ControlData controlToRemove = null;
foreach (string ignoredControlID in listIgnoredControlsID)
{
controlToRemove = data.Controls.Find(delegate(ControlData controlToFind)
{
return controlToFind.ControlId == ignoredControlID;
});
if (controlToRemove != null)
{
this.RemovePropertiesFromControl(controlToRemove,
listIgnoredPropertiesID);
controlToRemove = null;
}
}
this.StoredData = data.ToJson();
}
private void RemovePropertiesFromControl(ControlData controlToRemove,
List<string> listIgnoredPropertiesID)
{
PropertyData propertyToRemove = null;
foreach (string ignoredPropertyID in listIgnoredPropertiesID)
{
propertyToRemove = controlToRemove.Properties.Find(
delegate(PropertyData propertyToFind)
{
return propertyToFind.Name == ignoredPropertyID;
});
if (propertyToRemove != null)
{
controlToRemove.Properties.Remove(propertyToRemove);
propertyToRemove = null;
}
}
}
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