LINQ Zip and join

Add two list sequentially together according to it order... stop when end of one list.

Fast but limited compare with join.

(roleList).Zip(roleDescriptionList, (r, rd) => new RoleDescription() { roleID = r.dataID, role = r.dataValue, description = rd.dataValue }).ToList();

roleList and roleDescriptionList are two separate lists.  They can be unrelated at all.
Using Zip() to join them together to create a new list of object "RoleDescription" one by one.

To have better control, you should use join instead.


IList<RoleDescription> result = (from r in roleList
                         join rd in roleDescriptionList
                         on r.dataID equals rd.dataID
                         select new RoleDescription { 
                             roleID = r.dataID, 
                             role = r.dataValue, 
                             description = rd.dataValue }).ToList();