收集數據，並在列標籤顯示的數據

Question

我如何可以歸納爲表中的列沒有的dataGridView和我使用的SQL命令的方法和我的數據庫是SQL Server 2008中 我喜歡this script

Answer 1

你可以循環訪問DataTable並總結您喜歡的字段。

你可以嘗試這樣的事情之一，

string query = "SELECT Price FROM Bill"; 
OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, DBconn); 
DataTable dtSource = new DataTable(); 
dAdapter.Fill(dtSource); 
int colSum =0; 
foreach (DataRow dr in dtSource .Rows) 
{      
    colSum += Convert.ToInt32(dr["Price"]); 
} 
TotalValueLabel.Text = colSum.ToString(); 

對於乘法，你可以嘗試這樣的事情，

string query = "SELECT Qty,Price FROM Bill"; 
OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, DBconn); 
DataTable dtSource = new DataTable(); 
dAdapter.Fill(dtSource); 
dtSource.Columns.Add("3rdColumn"); 
foreach (DataRow dr in dtSource .Rows) 
{      
    dr["3rdColumn"]= Convert.ToInt32(dr["Qty"]) * Convert.ToInt32(dr["Price"]); 
} 

Answer 2

using System.Data;  

DataTable dt = new DataTable(); 
SqlDataAdapter sda = new SqlDataAdapter("Select Price from PriceList", connection); 
sda.Fill(dt); 
int sum=Convert.ToInt32(dt.Compute("sum(Price)","")); 
Label1.Text=sum.ToString();