Asp.net“全球” 变量

发布于 2024-07-15 17:24:03 字数 729 浏览 9 评论 0原文

我正在 ASP.NET 中编写一个页面，并且在回发初始化周期之后遇到问题：

我有（类似于）以下内容：

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....
         }
    }
}

发生的情况是我的代码很好地拾取了“passedString”，但是对于出于某种原因，在回发时，它会重置为默认值 - 即使我将默认值的分配放在 Page_Init 代码中......这让我想知道发生了什么......

有什么帮助吗？

原文

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

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....
         }
    }
}

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..

Any help?

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远昼 2024-07-22 17:24:03

一旦响应发送到浏览器，您的类成员变量就不再存在。尝试使用 Session 对象代替：

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....
         }
    }
}

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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