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;
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);
ConfigurationManager.RefreshSection("appSettings");// 刷新命名节,在下次检索它时将从磁盘重新读取它。记住应用程序要刷新节点
【修改后,App.config文件的x节点没有更改,而是exe.config的配置更改,读取正常】
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);