C# 應用程序配置文件App.Config和web.config

應用程序配置文件,對於asp.net是 web.config,對於WINFORM程序是 App.Config(ExeName.exe.config)。web

配置文件,對於程序自己來講,就是基礎和依據,其本質是一個xml文件。app

對於配置文件的操做,從.NET 2.0 開始,就很是方便了,提供了 System [.Web] .Configuration 這個管理功能的NameSpace,要使用它,須要添加對 System.configuration.dll的引用。asp.net

 

咱們以最多見的 AppSettings 小節來做爲例子:this

假設有以下的配置文件內容:spa

<?xml version="1.0" encoding="utf-8" ?>.net

<configuration>code

  <appSettings>xml

    <add key="y" value="this is Y"/>blog

  </appSettings>utf-8

</configuration>

 

1、ASP.NET

 

1.命名空間

  對於ASP.NET 程序, 使用 System.Web.Configuration.WebConfigurationManager;

2.讀取

  
  System.Web.Configuration.WebConfigurationManager.AppSettings[「y」];

3.添加

須要有寫權限:

  

Configuration config = WebConfigurationManager.OpenWebConfiguration(null); 

AppSettingsSection app = config.AppSettings; 

app.Settings.Add("x", "this is X"); 

config.Save(ConfigurationSaveMode.Modified);

 

4.修改

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);

 

5.刪除

Configuration config = WebConfigurationManager.OpenWebConfiguration(null); 

AppSettingsSection app = config.AppSettings;

app.Settings.Remove("x");

config.Save(ConfigurationSaveMode.Modified);

 

.

2、WINFORM / CONSOLE

 

1.命名空間

  對於WINFORM程序,使用 System.Configuration.ConfigurationManager;

2.讀取

  System.Configuration.ConfigurationManager.AppSettings[「y」];

3.添加

 

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 

AppSettingsSection app = config.AppSettings; 

app.Settings.Add("x", "this is X"); 

config.Save(ConfigurationSaveMode.Modified);

 

4.修改

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);

ConfigurationManager.RefreshSection("appSettings");// 刷新命名節,在下次檢索它時將從磁盤從新讀取它。記住應用程序要刷新節點

 

PS: 修改後,App.config文件的x節點沒有更改,而是exe.config的配置更改,讀取正常

 

 

5.刪除

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 

AppSettingsSection app = config.AppSettings; 

app.Settings.Remove("x"); 

config.Save(ConfigurationSaveMode.Modified);
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