ASP.NET Tutorial/Configuration/appSettings

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ConfigurationSettings.AppSettings

<%@ Page Language="VB" %>
<html>
<head>
   <script runat="server">
      Sub Page_Load()
         Message1.Text &= ConfigurationSettings.AppSettings("machineConfigKey")
         Message2.Text &= ConfigurationSettings.AppSettings("applicationConfigKey")
      End Sub
   </script>
</head>
<body>
   <asp:label id="Message1" runat="server">Machine.Config setting: </asp:label>
   <br/>
   <asp:label id="Message2" runat="server">Web.Config setting: </asp:label>
</body>
</html>
File: Web.Config
<configuration>
   <appSettings>
      <add key="applicationConfigKey" value="bar"/>
   </appSettings>
   <system.web>
      <authorization>
         <deny users="?"/>
      </authorization>
   </system.web>
</configuration>


Loading string from Web.config (C#)

File: Web.config
<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="DataFilePath" value="e:\NetworkShare\Documents\WebApp\Shared"/>
  </appSettings>
  
</configuration>

File: ShowSettings.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ShowSettings.aspx.cs" Inherits="ShowSettings" %>
<!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>Untitled Page</title>
</head>
<body>
    <form ID="form1" runat="server">
    <div>
      <asp:Label ID="lblTest" runat="server" />    
    </div>
    </form>
</body>
</html>

File: ShowSettings.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Web.Configuration;
public partial class ShowSettings : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    lblTest.Text = "This app will look for data in the directory:<br /><b>";
    lblTest.Text += WebConfigurationManager.AppSettings["DataFilePath"];
    lblTest.Text += "</b>";    
    }
}


Retrieve AppSetting

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="RetrieveAppSetting" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <ul>
      <li><asp:Label ID="appSettingValue" runat="server" /></li>
      <li><asp:Label ID="appSettingsExample" runat="server" Text="<%$ AppSettings:AnotherSetting %>" /></li>
      <li><asp:Label ID="connStr" runat="server" /></li>
      <li><asp:Label ID="connection" runat="server" Text="<%$ ConnectionStrings:sqlDb %>" /></li>
      <li><asp:Label ID="lblMyStuff" runat="server" /></li>
    </ul>
    <asp:SqlDataSource ID="ds" runat="server" ConnectionString="<%$ ConnectionSTrings:sqlDb %>"></asp:SqlDataSource>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Web.Configuration;

public partial class RetrieveAppSetting : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    appSettingValue.Text = ConfigurationManager.AppSettings["MySetting"];
    connStr.Text = ConfigurationManager.ConnectionStrings["sqlDb"].ConnectionString;
    lblMyStuff.Text = MySettings.Settings.Bar;
  }
}


Retrieve values from the appSettings section either programmatically or declaratively.

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Configuration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        lblWelcome.Text = WebConfigurationManager.AppSettings["welcome"];
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show AppSettings</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblWelcome"
        Runat="server" />
    <hr />
    <asp:Literal
        id="ltlCopyright"
        Text="<%$ AppSettings:copyright %>"
        Runat="server" />
    </div>
    </form>
</body>
</html>

File: Web.config
<configuration>
  <appSettings>
    <add key="welcome" value="Welcome to our Web site!" />
    <add key="copyright" value="Copyright (c) 2007 by the company" />
  </appSettings>
</configuration>


Storing Custom Settings in the web.config File

ASP.NET stores your own settings in the web.config file, in an element called <appSettings>. 
<?xml version="1.0" ?>
<configuration>
    ...
    <appSettings>
        <add key="DataFilePath" value="C:\Shared" />
    </appSettings>
    ...
    <system.web>
    <!-- ASP.NET Configuration sections go here. -->
    </system.web>
    ...
</configuration>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Configuration/appSettings&oldid=2804»