Question

c# 动态修改app.config文件

app.config这个的文件配置了数据库，用户名和密码。我想动态地修改他，该怎么做？
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
</configSections>
<connectionStrings>
<add name="jdgl.Properties.Settings.jdglConnectionString" connectionString="Data Source=.;Initial Catalog=jdgl;Persist Security Info=True;User ID=sa;Password=123"
providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
我的app。config文件是这个样，怎么来动态修改，请大虾们帮帮忙，xml还没学过，谢谢！

Answer 1

public class AppConfig
{
private XmlDocument Doc=new XmlDocument();
private AppDomain Ad = AppDomain.CurrentDomain;
public AppConfig()
{
Doc.Load(Ad.SetupInformation.ConfigurationFile);
}
public void LoadAppConfig()
{
Doc.Load(Ad.SetupInformation.ConfigurationFile);
}
public void SetAppValue(string key,string newValue)
{
Doc.SelectSingleNode("/configuration/appSettings/add[@key='"+key+"']").Attributes["value"].Value = newValue;
}
public void SaveAppConfig()
{
Doc.Save(Ad.SetupInformation.ConfigurationFile);
Doc.Load(Ad.SetupInformation.ConfigurationFile);
}
public string GetAppValue(string key)
{
return Doc.SelectSingleNode("/configuration/appSettings/add[@key='" + key + "']").Attributes["value"].Value;
}
}

Answer 2

...........那就不要写在app.config里，写在代码里，专门写个dbhelper类，用来操作链接数据库

Answer 3

linq类,或者直接文件读取
最好使用XML类,和操作XML一样，直接查询<ConnetionString>的键值来操作（SetValue)

Answer 4

那文件是个XML格式的文档

和对XML文档的操作方式一样，找节点，改节点的属性什么的都没区别