在A.aspx页面中按钮触发：HttpCookie pcook = new HttpCookie("uInfo");
pcook.Values["Name"] = "jock";
pcook.Values["Type"] = "1";
pcook.Expires = DateTime.Now.AddDays(1);
Response.AppendCookie(pcook);然后跳转到B.aspx页面：
protected void Page_Load(object sender, EventArgs e)
{
HttpCookie cook = Request.Cookies["uInfo"];
string cookstr = cook.Values["Name"];
Response.Write(cookstr);
}
错误：
string cookstr = cook.Values["Name"]; 这句报错“未将对象引用设置到对象的实例”看来是cookie没写上，这是哪步出错了啊
pcook.Values["Name"] = "jock";
pcook.Values["Type"] = "1";
pcook.Expires = DateTime.Now.AddDays(1);
Response.AppendCookie(pcook);然后跳转到B.aspx页面：
protected void Page_Load(object sender, EventArgs e)
{
HttpCookie cook = Request.Cookies["uInfo"];
string cookstr = cook.Values["Name"];
Response.Write(cookstr);
}
错误：
string cookstr = cook.Values["Name"]; 这句报错“未将对象引用设置到对象的实例”看来是cookie没写上，这是哪步出错了啊
解决方案 »
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if(cook!=null)
{
string cookstr = cook.Values["Name"];
Response.Write(cookstr);
}
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="btnShow" runat="server" Text="显示cookie [Name]"
onclick="btnShow_Click" />
<asp:Button ID="btnSet" runat="server" Text="设置cookie [Name]"
onclick="btnSet_Click" />
<asp:Button ID="btnDel" runat="server" Text="删除cookie [Name]"
onclick="btnDel_Click" />
</div>
</form>
</body>
</html>
protected void btnShow_Click(object sender, EventArgs e)
{
if (Request.Cookies["Name"] == null)
{
Response.Write("Cookies[Name] 不存在");
}
else
{
Response.Write(string.Format("Cookies[Name]:{0}", Request.Cookies["Name"].Value));
}
}
protected void btnSet_Click(object sender, EventArgs e)
{
if (Request.Cookies["Name"] == null)
{
HttpCookie hc = new HttpCookie("Name", "Sandy");
hc.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(hc);
}
else
{
Response.Cookies["Name"].Value = "Sandy";
Response.Cookies["Name"].Expires = DateTime.Now.AddDays(1);
}
}
protected void btnDel_Click(object sender, EventArgs e)
{
if (Request.Cookies["Name"] != null)
{
Response.Cookies["Name"].Expires = DateTime.Now.AddDays(-1);
}
}
pcook.Values["Name"] = "jock";
pcook.Values["Type"] = "1";
pcook.Expires = DateTime.Now.AddDays(1);
Response.AppendCookie(pcook); ---------
也许你的按钮点击代码以后马上跳转导致A页面回传数据没完成就到B页面了,导致cookie没进入客户端,
在这段代码后加上Response.Flush();后再跳转试试
if(cook!=null) 但是为什么会取不到cookies就要靠楼主自己调试才清楚了
你的写法好怪,是正确的吗?
建议:
pcook.Values["Name"] = "jock";
pcook.Values["Type"] = "1";
改为
pcook.["Name"] = "jock";
pcook.["Type"] = "1";将
HttpCookie cook = Request.Cookies["uInfo"];
string cookstr = cook.Values["Name"];
改为
string cookstr = Request.Cookies["uInfo"]["Name"];
建议:
pcook.Values["Name"] = "jock";
pcook.Values["Type"] = "1";
改为
pcook["Name"] = "jock";
pcook["Type"] = "1"; 将
HttpCookie cook = Request.Cookies["uInfo"];
string cookstr = cook.Values["Name"];
改为
string cookstr = Request.Cookies["uInfo"]["Name"];