ASP.NET Tutorial/Configuration/ConfigurationManager — различия между версиями

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Текущая версия на 11:57, 26 мая 2010

Load connection string from ConfigurationManager

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="FromConfig" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Connection String from Config</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Go get data..." OnClick="Button1_Click" />
        <hr />
        <asp:DropDownList runat="server" ID="CustomerList" />
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class FromConfig : System.Web.UI.Page
{
    protected void Button1_Click(object sender, EventArgs e)
    {
        string connString = ConfigurationManager.ConnectionStrings["LocalNWind"].ConnectionString;
        using (SqlConnection conn = new SqlConnection(connString))
        {
            string cmdText = "SELECT * FROM customers";
            SqlCommand cmd = new SqlCommand(cmdText, conn);
            cmd.Connection.Open();
            SqlDataReader reader = cmd.ExecuteReader();
            CustomerList.Items.Clear();
            while (reader.Read())
                CustomerList.Items.Add(reader["companyname"].ToString());
            reader.Close();
             cmd.Connection.Close();
        }
    }
}
File: Web.config
<?xml version="1.0"?>
<configuration>
...
  <connectionStrings>
    <add name="LocalNWind" connectionString="SERVER=(local);DATABASE=northwind;Trusted_Connection=yes;" />
  </connectionStrings>
...
</configuration>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Configuration/ConfigurationManager&oldid=2786»