学步园

asp.net2.0新添加了对web.config直接操作的功能。开发的时候有可能用到在web.config里设置配置文件，其实是可以通过程序来设置这些配置节的。

asp.net2.0需要添加引用：

using System.Web.Configuration;

web.config里的配置节：

Code
  <appSettings>
    <add key="FilePath" value="g:\Test\WebConfigManager\Upload\" />
    <add key="p" value="g:\" />
  </appSettings>

（1）读

string filepath = ConfigurationManager.AppSettings["FilePath"]; （2）添加         Configuration config = WebConfigurationManager.OpenWebConfiguration("/WebConfigManager");
         AppSettingsSection app = config.AppSettings;
         app.Settings.Add("p", "p:\\");
         config.Save(ConfigurationSaveMode.Modified); （3）修改           Configuration config = WebConfigurationManager.OpenWebConfiguration("/WebConfigManager");
             AppSettingsSection app = config.AppSettings;
             app.Settings["p"].Value = @"g:\";
             config.Save(ConfigurationSaveMode.Modified); （4）删除Configuration config = WebConfigurationManager.OpenWebConfiguration("/WebConfigManager");
         AppSettingsSection app = config.AppSettings;
         app.Settings.Remove("p");
         config.Save(ConfigurationSaveMode.Modified); 注意：（1）asp.net用户需要有读取、修改、写入的权限。

（2）WebConfigManager是web.config所在的文件夹名。

1. 读取值： 
* Asp.Net: System.Web.Configuration.WebConfigurationManager.AppSettings[“y”]; 
* WinForm: System.Configuration.ConfigurationManager.AppSettings[“y”]; 
2. 添加一项 
ASP.NET(需要有写权限): 
Configuration config = WebConfigurationManager.OpenWebConfiguration(null); 
AppSettingsSection app = config.AppSettings; 
app.Settings.Add("x", "this is X"); 
config.Save(ConfigurationSaveMode.Modified); 
WinForm: 
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
AppSettingsSection app = config.AppSettings; 
app.Settings.Add("x", "this is X"); 
config.Save(ConfigurationSaveMode.Modified); 
3. 修改一项 
* Asp.Net 
Configuration config = WebConfigurationManager.OpenWebConfiguration(null); 
AppSettingsSection app = config.AppSettings; 
//app.Settings.Add("x", "this is X"); 
app.Settings["x"].Value = "this is not Y"; 
config.Save(ConfigurationSaveMode.Modified); 
* WinForm 
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
AppSettingsSection app = config.AppSettings; 
//app.Settings.Add("x", "this is X"); 
app.Settings["x"].Value = "this is not Y"; 
config.Save(ConfigurationSaveMode.Modified); 
4. 删除一项 
* Asp.Net 
Configuration config = WebConfigurationManager.OpenWebConfiguration(null); 
AppSettingsSection app = config.AppSettings; 
app.Settings.Remove("x"); 
config.Save(ConfigurationSaveMode.Modified); 
* WinForm 
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
AppSettingsSection app = config.AppSettings; 
app.Settings.Remove("x"); 
config.Save(ConfigurationSaveMode.Modified);