目录:
案例:
1 private void ComputeBySalesSalesID(DataSet dataSet) 2 { 3 // Presumes a DataTable named "Orders" that has a column named "Total." 4 DataTable table; 5 table = dataSet.Tables["Orders"]; 6 7 // Declare an object variable. 8 object sumObject; 9 sumObject = table.Compute("Sum(Total)", "EmpID = 5"); 10 }
1 DataTable dt = null; 2 dt=... 3 decimal money = Convert.ToDecimal(dt.Compute("Sum(money)", "true"));
案例:
1 // Fill the DataSet. 2 DataSet ds = new DataSet(); 3 ds.Locale = CultureInfo.InvariantCulture; 4 FillDataSet(ds); 5 6 DataTable products = ds.Tables["Product"]; 7 8 var query = 9 from product in products.AsEnumerable() 10 where product.Field<string>("Color") == "Red" 11 select new 12 { 13 Name = product.Field<string>("Name"), 14 ProductNumber = product.Field<string>("ProductNumber"), 15 ListPrice = product.Field<Decimal>("ListPrice") 16 }; 17 18 foreach (var product in query) 19 { 20 Console.WriteLine("Name: {0}", product.Name); 21 Console.WriteLine("Product number: {0}", product.ProductNumber); 22 Console.WriteLine("List price: ${0}", product.ListPrice); 23 Console.WriteLine(""); 24 }
结合linq语句
decimal money = dt.AsEnumerable().Sum(t => Math.Round((t.Field<Decimal>("money")) / 10000, 2));