获取AppSettings配置，获取连接字符串

using System.Configuration;//导入命名空间

//配置文件 Web.config
<appSettings>
<!--数据连接字符串-->
<add key="SqlConnectionStr" value="server=.;uid=sa;pwd=sa;database=RCCMS"/>
<add key="FCKEditor:BasePath" value="~/fckeditor"/>
<add key="FCKeditor:UserFilesPath" value="~/UploadFiles/"/>
</appSettings>

//在程序里获得配置文件的Key对应的值
System.Configuration.ConfigurationSettings.AppSettings["SqlConnectionStr"];
System.Configuration.ConfigurationManager.AppSettings["SqlConnectionStr"];
System.Configuration.ConfigurationManager.ConnectionStrings["SqlConnectionStr"].ToString();

　　获取连接字符串

ConfigurationManager.ConnectionStrings["connectionStringsName"].ToString();