public static int GetLookupIdFromValue(this SPFieldLookup field, string fieldValue)
{
int ret = 0;
try //assume fieldValue has both ID and Value
{
SPFieldLookupValue pairValue = new SPFieldLookupValue(fieldValue);
if (pairValue != null && pairValue.LookupId != 0)
{
return(pairValue.LookupId);
}
}
catch
{
SPSecurity.RunWithElevatedPrivileges(delegate()
{
using (SPWeb web = SPContext.Current.Site.OpenWeb(field.LookupWebId))
{
SPList list = web.Lists.GetList(new Guid(field.LookupList), false);
SPListItemCollection founds = list.FindItems(field.LookupField, fieldValue);
if (founds.Count > 0)
{
ret = founds[0].ID;
}
}
});
}
return(ret);
}