C# WinForm中 App.config 文件配置
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);
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);
https://www.cnblogs.com/zyj-keyen/archive/2012/07/26/2609885.html
