如何計算linq中的列值到sql查詢的總和？

Question

我寫此查詢：

var query2 = (from p in behzad.Compare_closed_numbers_in_CRM_and_Billing_system_detail_counters 
       where p.fileid == point.id 
       select new 
       { 
        p.count 
       }).ToArray(); 

在數列中有任何價值，我要總結所有的計數值。例如：

我該如何植入？謝謝。

Answer 1

如果計數字段INT試試這個：

int sum = behzad.Compare_closed_numbers_in_CRM_and_Billing_system_detail_counters 
    .Where(t=>t.fileid == point.id) 
    .Select(t => t.Count ?? 0).Sum(); 

如果計數字段是nvarchar(max)試試這個：

int sum = behzad.Compare_closed_numbers_in_CRM_and_Billing_system_detail_counters 
     .Where(t=>t.fileid == point.id) 
     .Select(t => Convert.ToInt32(t.Count)).Sum();