配置文件web.config

<appSettings>
<add key="webpages:Version" value="http://www.mamicode.com/3.0.0.0" />
<add key="webpages:Enabled" value="http://www.mamicode.com/false" />
<add key="ClientValidationEnabled" value="http://www.mamicode.com/true" />
<add key="UnobtrusiveJavaScriptEnabled" value="http://www.mamicode.com/true" />
<add key="PictureURL" value="C:/SavePicture"/>
</appSettings>

定义全局变量的类

public class Helper
{
public static string ConstURL ;

static Helper()
{
ConstURL =ConfigurationManager.AppSettings["PictureURL"];
}
}

把路径设置为全局变量