在ASP.Net中获取会话ID

 <system.web>
   <sessionState mode="InProc" cookieless="false" timeout="20"/>
  </system.web>
</configuration>

string sessionID = Session.SessionID;

// 将会话ID存储在一个隐藏字段中
HiddenField hiddenField = new HiddenField();
hiddenField.Value = Session.SessionID;

// 将会话ID存储在一个Cookie中
HttpCookie cookie = new HttpCookie("SessionID", Session.SessionID);
cookie.Expires = DateTime.Now.AddMinutes(20);
Response.Cookies.Add(cookie);

// 从隐藏字段中获取会话ID
string sessionID = hiddenField.Value;

// 从Cookie中获取会话ID
string sessionID = Request.Cookies["SessionID"].Value;