public static void HandleItemDeleting(SPItemEventProperties properties)
{
var webURL = properties.ListItem.Web.Url;
//if we are dealing with a document set, we need to do a few things
if (properties.ListItem.File != null && SPListItemExtensions.IsDocumentSetItem(properties.ListItem))
{
//1. handle our SetItemID
if (properties.BeforeProperties["SetItemID"] == null)
{
SPList docSetList = properties.List;
SPQuery query = new SPQuery();
query.Folder = properties.ListItem.File.ParentFolder;
query.Query = "<Where><Neq><FieldRef Name='ID' /><Value Type='Integer'>" + properties.ListItem.ID + "</Value></Neq></Where><OrderBy><FieldRef Name='SetItemID' Ascending='TRUE' /></OrderBy>";
SPListItemCollection Items = docSetList.GetItems(query);
if (Items.Count > 0)
{
var j = 1;
SPListItem item = null;
for (int i = 0; i <= Items.Count - 1; i++)
{
item = Items[i];
item["SetItemID"] = j;
item.Update();
j = j + 1;
}
}
}
}
}
public static void HandleItemAdded(SPItemEventProperties properties)
{
bool updateRequired = false;
string webURL = properties.ListItem.Web.Url;
//if we are dealing with a document set, we need to do a few things
int nextNumber = 0;
if (properties.ListItem.File != null && SPListItemExtensions.IsDocumentSetItem(properties.ListItem))
{
// handle our SetItemID
if (properties.ListItem["SetItemID"] == null)
{
SPList docSetList = properties.List;
SPQuery query = new SPQuery();
query.RowLimit = 1;
query.Folder = properties.ListItem.File.ParentFolder;
query.Query = "<OrderBy><FieldRef Name='SetItemID' Ascending='FALSE' /></OrderBy>";
SPListItemCollection Items = docSetList.GetItems(query);
if (Items.Count > 0)
{
SPListItem item = Items[0];
nextNumber = Convert.ToInt32(item["SetItemID"]) + 1;
}
properties.ListItem["SetItemID"] = nextNumber.ToString();
updateRequired = true;
}
}
else
{
if (properties.ListItem["SetItemID"] != null && !string.IsNullOrEmpty(properties.ListItem["SetItemID"].ToString()))
{
properties.ListItem["SetItemID"] = null;
updateRequired = true;
}
}
if (updateRequired)
{
properties.ListItem.Update();
}
}