//Improvement
public List <SPListItem> MissingListItemsV1()
{
var results = new List <SPListItem>();
foreach (var list in this.GetExistingLists)
{
try
{
//get source list items
IEnumerable <SPListItem> sourceListItems = null;
if (SourceSiteCreds.SiteType == SiteType.WSS)
{
sourceListItems = this.SharePointRepository2007.GetListItems(list);
}
else
{
sourceListItems = this.SharePointRepository.GetListItems(SourceClientContext, list);
}
//get target list items
List <SPListItem> targetListItems = this.SharePointRepository.GetListItems(TargetClientContext, list);
//key is hashcode, while value is the actual list item
Dictionary <int, SPListItem> hashedListItems = new Dictionary <int, SPListItem>();
bool useDefaultHashCode = false;
//go retrieve all target list items and add it to the dictionary
try
{
foreach (var listItem in targetListItems)
{
hashedListItems.Add(listItem.GetListItemHashCode(), listItem);
}
}
catch (Exception ex)
{
if (ex.Message == "An item with the same key has already been added.")
{
//then we have a problem
useDefaultHashCode = true;
hashedListItems = new Dictionary <int, SPListItem>();
foreach (var listItem in targetListItems)
{
hashedListItems.Add(listItem.GetListItemDefaultHashCode(), listItem);
}
}
}
//get all list items, transform it and then compare key.
foreach (var listItem in sourceListItems)
{
//string manipulation - convert source list items to its target list equivalent items and store it in a temp object
SPListItem transformSourceListItem = new SPListItem()
{
FileDirRef = ConvertToTargetUrl(listItem.FileDirRef),
FileRef = ConvertToTargetUrl(listItem.FileRef),
ID = listItem.ID,
Title = listItem.Title,
ModifiedDate = listItem.ModifiedDate,
ListBaseType = listItem.ListBaseType,
EncodedAbsUrl = listItem.EncodedAbsUrl,
Name = listItem.Name
};
//HashSet comparision - faster than List<> -- comparision based on the hashcode
int targetKeyHashCode = (useDefaultHashCode) ? transformSourceListItem.GetListItemDefaultHashCode() : transformSourceListItem.GetListItemHashCode();
if (!hashedListItems.ContainsKey(targetKeyHashCode))
{
logger.Log(LogLevel.Info, $"Missing ListItem:{listItem.FileRef}");
results.Add(listItem);
}
}
}
catch (Exception ex)
{
logger.Log(LogLevel.Error, ex);
}
}
return(results);
}