新建類 CustomSessionIDManager

    public class CustomSessionIDManager : SessionIDManager, ISessionIDManager
    {
        private SessionStateSection pConfig = null;
        string ISessionIDManager.GetSessionID(HttpContext context)
        {
            if (pConfig == null)
            {
                Configuration cfg 
 
=
                  WebConfigurationManager.OpenWebConfiguration(System.Web.Hosting.HostingEnvironment.ApplicationVirtualPath);
                pConfig = (SessionStateSection)cfg.GetSection("system.web/sessionState");
            }

            string sid = base.GetSessionID(context);//默認從Cookie、UseUri 中獲取

            
 
if (string.IsNullOrWhiteSpace(sid)
                && !string.IsNullOrWhiteSpace(context.Request.QueryString[pConfig.CookieName]))
            {
                var _sid = context.Request.QueryString[pConfig.CookieName];//從自定義查詢字符中獲取，也可以擴展從自定義Header中獲取
                

                return
 
 sid;
            }
            return sid;
        }
    }

修改Web.Config

  <system.web>    
    <sessionState cookieName="_sid" sessionIDManagerType="命名空間.CustomSessionIDManager" />

自定義 Asp.Net SessionID 獲取方式