C#程序中session的基本设置示例及清除session的方法

session的基本设置：

using system;
using system.collections.generic;
using system.text;
using system.web;
using system.web.sessionstate;

namespace oaframework
{
  public class csession
  {
      public static object get(string key)
    {
      return httpcontext.current.session[key];
    }


  public static string getstring(string key)
    {
      object obj = httpcontext.current.session[key];
      if (obj == null) return "";
      else return obj.tostring();
    }


    public static object get(string key,object defaultvalue)
    {
      if (httpcontext.current.session[key] == null)

        return defaultvalue;
      else
        return httpcontext.current.session[key];

    }


    public static object get(string key, object defaultvalue,boolean canadd)
    {
      if (httpcontext.current.session[key] == null)
      {
        if(canadd==true)
          httpcontext.current.session.add(key, defaultvalue);

        return defaultvalue;
      }
      else
        return httpcontext.current.session[key];

    }


    public static boolean set(string key,object value)
    {
      try
      {
        if (value == null && httpcontext.current.session[key] != null)
        {
          httpcontext.current.session.remove(key);
        }
        else if (httpcontext.current.session[key] == null)
          {
            httpcontext.current.session.add(key, value);
          }
          else
          {
            httpcontext.current.session[key] = value;
          }

        return true;
      }
      catch (exception ex)
      {
        cmsgbox.show(ex.message); 
        return false;
      }

    }
 

      
    
  }
}

清除session：

session.abandon();//清除全部session
//清除某个session
session["username"] = null;
session.remove("username");