Question

I have this that selects all cities:

ExecuteStoreCommand<MCT_DBEntities>("select * from cities", ConnectionResolver.DB_Connection);

Now I am trying to convert the to Lambda, but how do I tell it to SELECT *?

GetWithExpression<city, MCT_DBEntities>(u => u.SelectMany, ConnectionResolver.DB_Connection);

Edit:

   private static TValue RetryGetWithExpression<U,T, TValue>(Func<ObjectSet<T>, TValue> func, String connection, Int32 retryInfiniteLoopGuard = 0)
        where T : class
        where U : ObjectContext
    {
        Microsoft.Practices.TransientFaultHandling.RetryPolicy policy = RetryPolicyProvider.GetSqlAzureRetryPolicy();

        using (U entitiesContext = (U)Activator.CreateInstance(typeof(U), new[] { connection }))
        {...}

Answer 1

If your first parameter is Expression<Func<T, bool>> you may want:

RetryGetWithExpression<city, MCT_DBEntities>(_ => true, ConnectionResolver.DB_Connection);

Edit.
This should work:

RetryGetWithExpression<MCT_DBEntities, city, IQueryable<city>>(x => x.Select(y => y), 
                                        ConnectionResolver.DB_Connection);