为会话分配值 [英] Assigning a value to a session

问题描述

嗨

我有一个带有图像按钮作为模板字段的dataList。并且标签上有一个名字。

我试图让按钮启动一个新页面并将标签的值传递给会话。



我试过这段代码，但它一直说对象引用未设置为对象的实例。

  protected   void  ImageButton1_Click（ object  sender，ImageClickEventArgs e） 
 {
标签lk =（标签）DataList1.FindControl（  APP01Label ）; 
会话[  testName] = lk.Text; 
 ClientScript.RegisterStartupScript（ this  .GetType（），  myalert，  alert（' + Session [  testName]。ToString（）+  '）;， true ）; 
} 

这里我想通过在消息框中显示会话值来测试它。



谢谢

解决方案

我怀疑错误发生在这一行： Session [testName ] = lk.Text 因为上一行可能找不到名称为 APP01Label 的控件。

我建议您更改代码如下： if（lk！= null）{Session [testName] = lk.Text; }

Hi
I have a dataList with an image button as template field. and a label holds a name.
I trying to make the button fire up a new page and pass the value of the label to a session.

I tried this code but it keep saying "Object reference not set to an instance of an object".

protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
    Label lk = (Label)DataList1.FindControl("APP01Label");
    Session["testName"] = lk.Text;
    ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + Session["testName"].ToString() + "');", true);
}

here I want to test it by showing the Session value in a message box.

thanks

解决方案

I suspect that the error is happening on this line: Session["testName"] = lk.Text because the previous line may not find a control with the name APP01Label.
I would suggest that you change the code like this: if( lk != null ){ Session["testName"] = lk.Text; }

这篇关于为会话分配值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！