如何從數據集中讀取int值？在C＃

Question

如果我有一個返回DataSet的函數，那有一個int值的行。

我怎樣讀取int值？

Answer 1

爲什麼要將數據集用於單個靜態值。如果您使用的是SQL讀者使用的ExecuteScalar功能

例子：

function GetIntValue() 
{ 
SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["con"]); 

    con.Open(); 

    SqlCommand cmdCount = new SqlCommand("SELECT COUNT(*) FROM Employees",con); 
    int numberOfEmployees = (int)cmdCount.ExecuteScalar(); 
    Response.Write("Here are the " + numberOfEmployees.ToString() + " employees: <br><br>"); 

    SqlCommand cmd = new SqlCommand("SELECT * FROM Employees",con); 
    SqlDataReader dr = cmd.ExecuteReader(); 
    while(dr.Read()) { 
     Response.Write(dr["LastName"] + "<br>"); 
    } 
    con.Close(); 
}