/// <summary>
/// Called after a metadata item has been created for an object but before it has been added to
/// the <see cref="IGalleryObject.MetadataItems" /> collection.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="AddMetaEventArgs" /> instance containing the event data.</param>
private void OnBeforeAddMetaItem(object sender, AddMetaEventArgs e)
{
switch (e.MetaItem.MetadataItemName)
{
case MetadataItemName.GpsLocationWithMapLink:
if (MetadataReadWriter.GetMetaValue(MetadataItemName.GpsLocation) == null)
{
e.MetaItem.Value = String.Empty;
}
break;
case MetadataItemName.GpsDestLocationWithMapLink:
if (MetadataReadWriter.GetMetaValue(MetadataItemName.GpsDestLocation) == null)
{
e.MetaItem.Value = String.Empty;
}
break;
}
}
public void ExtractMetadata(IMetadataDefinition metaDef)
{
if (MetadataDefinitionApplies(metaDef))
{
var metaItem = CreateMetaItem(metaDef);
// Raise the BeforeAddMetaItem event.
if (BeforeAddMetaItem != null)
{
var args = new AddMetaEventArgs(metaItem);
BeforeAddMetaItem(this, args);
if (args.Cancel)
{
RemoveMetadataItem(metaDef.MetadataItem);
return;
}
}
// Add/update the item, but only when it is defined as being editable or has a value.
if (metaItem.MetaDefinition.IsEditable || !String.IsNullOrWhiteSpace(metaItem.Value))
UpdateInternalMetaItem(metaItem);
else if (Array.IndexOf(RequiredMetadataItems, metaDef.MetadataItem) < 0)
RemoveMetadataItem(metaDef.MetadataItem);
}
else
RemoveMetadataItem(metaDef.MetadataItem);
}