Question

I tried to split a string in a linq query. I got an error says “Unrecognized expression node: ArrayIndex”. Does anyone know how to achive this? My code sample is:

List<Task> Result= (from t in TaskDB.Tasks
                                       select new Task
                                       {
                                           Description = t.Description.Split('-')[0].ToString(),
                                           Id = ts.id,
                                       }).ToList();

Answer 1

The problem is that the select part of your query can’t be converted into SQL to be executed on the server (hence the “unrecognised expression node” error). Try something like this, which insures that the necessary code is executed on the client side:

var result = (from t in TaskDB.Tasks.AsEnumerable()
              select new Task
              {
                  Description = t.Description.Split('-')[0].ToString(),
                  Id = ts.id,
              }).ToList();

The trick here is simply to call the AsEnumerable extension method before selecting the items.