动态修改Web.config 文件

有时候我们需要在程序中动态的修改Web.config文件，这里我提供一个类来对Web.config文件进行动态的操作。

    public abstract class AppControl
    {

        public static void UpdateConnectionString(string newName,string newConString,string newProviderName,string path)
        {
            string[] strs = path.Split( '\\' );
            string exePath = strs[ strs.Length - 2 ];
            ConnectionStringSettings mySettings = new ConnectionStringSettings(newName, newConString, newProviderName);
            Configuration config = WebConfigurationManager.OpenWebConfiguration( "/" + exePath );
            config.ConnectionStrings.ConnectionStrings.Remove(newName);
            config.ConnectionStrings.ConnectionStrings.Add(mySettings);
            config.ConnectionStrings.SectionInformation.ForceSave = true;
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection( "connectionStrings" );
        }
　　}

 "newName"是你要修改的connectionString的名字，“newConString” 是新的连接字符串，“path”是web.config文件所在的文件夹的全路径。

    <connectionStrings>
        <add name="constr" connectionString="server=10.0.0.0;database=zz;uid=sa;pwd=sa;"/>
    </connectionStrings>

修改Web.config

 string strSql = "server=.;database=test;uid=sa;pwd=sa";
 AppControl.UpdateConnectionString( "constr", strSql, "", path );