.Net 对App.config和Web.config的访问操作（增、删、读、改）

一。首先引用Configuration

1)App.config如下：

using System.Configuration;//若果还没有Configuration,右键引用文件夹添加引用，在.NET中找到System.configuration添加

2)Web.config如下：

using System.Configuration;

using System.Web.Configuration;

1)App.config页面代码如下：

1 <?xml version="1.0" encoding="utf-8" ?>
2 <configuration>
3 <appSettings>
4 <add key="name" value="张三"/>
5 </appSettings>
6 </configuration>

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2)Web.config页面代码如下：

 1 <?xml version="1.0"?>
 2 <!--
 3   有关如何配置 ASP.NET 应用程序的详细信息，请访问
 4   http://go.microsoft.com/fwlink/?LinkId=169433
 5   -->
 6 <configuration>
 7   <system.web>
 8     <compilation debug="true" targetFramework="4.0"/>
 9   </system.web>
10   <appSettings>
11     <add key="name" value="张三"/>
12   </appSettings>
13 </configuration>

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二。增加

1)App.config示例：

1 Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
2             AppSettingsSection appsettings = (AppSettingsSection)config.GetSection("appSettings");
3             appsettings.Settings.Add("color", "blue");
4             config.Save();
5             string str = ConfigurationManager.AppSettings["color"];

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2）Web.config示例：

1 Configuration config = WebConfigurationManager.OpenWebConfiguration(null);
2        AppSettingsSection app = config.AppSettings;
3        app.Settings.Add("color", "blue");
4        config.Save(ConfigurationSaveMode.Modified);
5        string str=WebConfigurationManager.AppSettings["color"];

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三。删除

App.config示例：

1 Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
2             AppSettingsSection appsettings = (AppSettingsSection)config.GetSection("appSettings");
3             appsettings.Settings.Remove("name");
4             config.Save();
5             ConfigurationManager.RefreshSection("name");
6             string str = ConfigurationManager.AppSettings["name"];

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Web.config示例：

1  Configuration config = WebConfigurationManager.OpenWebConfiguration(null);
2         AppSettingsSection app = config.AppSettings;
3         app.Settings.Remove("name");
4         config.Save();
5         string str1=WebConfigurationManager.AppSettings["name"];

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四。读取

1)App.config示例：

1 string str=ConfigurationManager.AppSettings["name"];

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2)Web.config示例：

1 string str=WebConfigurationManager.AppSettings["color"];

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五。修改

App.config示例：

1         Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
2         config.AppSettings.Settings["name"].Value = "李四";
3         config.Save();
4         string str = ConfigurationManager.AppSettings["name"];

View Code

Web.config示例：

1         Configuration config = WebConfigurationManager.OpenWebConfiguration(null);
2         config.AppSettings.Settings["name"].Value = "李四";
3         config.Save();
4         string str = ConfigurationManager.AppSettings["name"];

View Code

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