Asp.net＆QUOT;全球及QUOT;变量 [英] Asp.net "Global" variables

问题描述

我正在写在ASP.NET页面时遇到下列初始化上回发的周期问题：

I'm writing a page in ASP.NET and am having problems following the cycle of initialization on postbacks:

我有（类似的东西）以下内容：

I have (something akin to) the following:

public partial class MyClass : System.Web.UI.Page
{
    String myString = "default";

    protected void Page_Init(object o, EventArgs e)
    {
        myString = Request["passedString"];
        //note that I've tried to set the default here in Init on NULL...
    }

    protected void Page_Load(object o, EventArgs e)
    {
         if(!Postback)
         {
             //code that uses myString....
         }
         else
         {
            //more code that uses myString....
         }
    }
}

和正在发生的事情是，我的code拿起passedString就好了，但由于某些原因，在回发，其重置为默认值 - 即使我放在Page_Init $默认的分配C $Ç......这使我想知道这是怎么回事。

And what's happening is that my code picks up the "passedString" just fine, but for some reason, on postback, it resets to the default value - even if I put the assignment of the default in the Page_Init code... which makes me wonder what's going on..

任何帮助吗？

推荐答案

您的类成员变量不住就曾经响应发送到浏览器。尝试使用Session对象，而不是：

Your class member variables do not live on once the response is sent to the browser. Try using the Session object instead:

public partial class MyClass : System.Web.UI.Page
{    

    protected void Page_Init(object o, EventArgs e)
    {
        Session["myString"] = Request["passedString"];
        //note that I've tried to set the default here in Init on NULL...
    }

    protected void Page_Load(object o, EventArgs e)
    {
         string myString = (string) Session["myString"];

         if(!Postback)
         {
             // use myString retrieved from session here
         }
         else
         {
            //more code that uses myString....
         }
    }
}

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