vs中配置文件读写

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

配置文件,对于程序本身来说,就是基础和依据,其本质是一个xml文件,对于配置文件的操作,从.NET 2.0 开始,就非常方便了,提供了 System [.Web] .Configuration 这个管理功能的NameSpace,要使用它,需要添加对 System.configuration.dll的引用。

对于WINFORM程序,使用 System.Configuration.ConfigurationManager;

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

对于配置文件内容的读取,真是太普遍不过了,如果你的程序里,没有读取配置文件内容的方面,你都不好意思拿出来用

我们以最常见的 AppSettings 小节来作为例子:

假设有如下的配置文件内容:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="y" value="this is Y"/>
  </appSettings>
</configuration>

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);

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