会话变量比较不起作用 [英] session variable comparison not working

问题描述

if (Session["Type"].ToString().Equals("Admin", StringComparison.CurrentCultureIgnoreCase))
           {
               LinkButton_logout.Text = "Logout";
               Label_loggedin.Text = "Welcome " + Session["Alias"].ToString();
           }
           else if (Session["Type"] == null)
           {
               Response.Redirect("Default.aspx");
           }

链接按钮文字和标签文字不变......甚至不重定向默认页面

link button text and label text not changing ...not even redirecting to default page

推荐答案

如果Session [Type]是 null ，那么尝试调用ToString它将在第一个 if 条件下抛出Null Reference异常 - 这将终止操作。



更改测试的顺序 - 总是首先检查 null ，永远不会持续！

If Session["Type"] is null, then the attempt to call ToString on it will throw a "Null Reference" exception on the first if condition - which will terminate the operation.

Change the order of your tests - always check for null first, never last!

首先你要检查null然后去比较。代码应该看起来像

First you should check against null then go for comparison. The code should look like

string type = Session["Type"] as string;

if (null == type)
{
    Response.Redirect("Default.aspx", true);
}
if (type.Equals("Admin",StringComparison.OrdinalIgnoreCase))
{
    LinkButton_logout.Text = "Logout";
    Label_loggedin.Text = "Welcome " + Convert.ToString(Session["Alias"]);
}

试试这个

Try this

if (Session["Type"] == null)
{
    Response.Redirect("Default.aspx");
}
else if(String.Equals(Convert.ToString(Session["Type"]), "Admin",StringComparison.OrdinalIgnoreCase))
{
    LinkButton_logout.Text = "Logout";
    Label_loggedin.Text = "Welcome " + Convert.ToString(Session["Alias"]);
}

注意：在此代码之前，请检查您的会话是否具有要处理的正确值。



问候.. :)

Note: Before this code,check that your sessions have proper values to be handled.

Regards..:)

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