变量传递空值
本文关键字:空值 变量 | 更新日期: 2023-09-27 18:08:37
我已经尝试设置我的会话值,但每次我想要显示用户在上一页中输入的文本时,它返回null
我有三个页面订户的详细信息,包的选择和银行的详细信息,所有三个页面遵循对方和用户已经填写了他/她想要的信息和点击下一步,他们被定向到一个页面,他们输入的所有信息都显示。
我似乎看不出我做错了什么?
SubscriberDetails.aspx
protected void Button1_Click(object sender, EventArgs e)
{
string FullName = txtFullName.Text;
string CompanyName = txtCompanyName.Text;
string Vat = txtVAT.Text;
string ContactNumber = txtContactNumber.Text;
string Fax = txtFax.Text;
string District = txtDistrict.Text;
string Street = txtStreet.Text;
string City = txtCity.Text;
string Code = txtPostal.Text;
string Trading = txtTrading.Text;
string Id = txtID.Text;
string ContactPerson = txtContactPerson.Text;
string Email = txtEmail.Text;
Session["FullName"] = FullName;
Session["CompanyName"] = CompanyName;
Session["VAT"] = Vat;
Session["ContactNumber"] = ContactNumber;
Session["Fax"] = Fax;
Session["District"] = District;
Session["City"] = City;
Session["Street"] = Street;
Session["Code"] = Code;
Session["Trading"] = Trading;
Session["ID"] = txtID.Text;
Session["ContactPerson"] = ContactPerson;
Session["Email"] = Email;
}
Final.aspx
protected void Page_Load(object sender, EventArgs e)
{
if (string.IsNullOrEmpty((string)Session["Fullname"]))
{
lblFullName.Text = "N/A";
}
else
{
lblFullName.Text = Session["FullName"].ToString();
}
if (string.IsNullOrEmpty((string)Session["CompanyName"]))
{
lblCompanyName.Text = "N/A";
}
else
{
lblCompanyName.Text = Session["CompanyName"].ToString();
}
if (string.IsNullOrEmpty((string)Session["VAT"]))
{
lblVat.Text = "N/A";
}
else
{
lblVat.Text = Session["VAT"].ToString();
}
if (string.IsNullOrEmpty((string)Session["ContactNumber"]))
{
lblContactNumber.Text = "N/A";
}
else
{
lblContactNumber.Text = Session["ContactNumber"].ToString();
}
if (string.IsNullOrEmpty((string)Session["Fax"]))
{
lblFax.Text = "N/A";
}
else
{
lblFax.Text = Session["Fax"].ToString();
}
if (string.IsNullOrEmpty((string)Session["District"]))
{
lblDistrict.Text = "N/A";
}
else
{
lblDistrict.Text = Session["District"].ToString();
}
if (string.IsNullOrEmpty((string)Session["Street"]))
{
lblStreet.Text = "N/A";
}
else
{
lblStreet.Text = Session["Street"].ToString();
}
if (string.IsNullOrEmpty((string)Session["City"]))
{
lblCity.Text = "N/A";
}
else
{
lblCity.Text = Session["City"].ToString();
}
if (string.IsNullOrEmpty((string)Session["Code"]))
{
lblCode.Text = "N/A";
}
else
{
lblCode.Text = Session["Code"].ToString();
}
if (string.IsNullOrEmpty((string)Session["Trading"]))
{
lblTrading.Text = "N/A";
}
else
{
lblTrading.Text = Session["Trading"].ToString();
}
if (string.IsNullOrEmpty((string)Session["ID"]))
{
lblID.Text = "N/A";
}
else
{
lblID.Text = Session["ID"].ToString();
}
if (string.IsNullOrEmpty((string)Session["ContactPerson"]))
{
lblContactPerson.Text = "N/A";
}
else
{
lblContactPerson.Text = Session["ContactPerson"].ToString();
}
if (string.IsNullOrEmpty((string)Session["Email"]))
{
lblMail.Text = "N/A";
}
else
{
lblMail.Text = Session["Email"].ToString();
}
}
你没有很多选择,如果发生这种情况,你的会话有问题。也许每个其他请求都在启动一个新的会话,检查它以确保它没有发生。
检查:
Session.SessionID;
我看到一段代码使用TextBox
控件,下一段使用Label
控件。
也许你没有看错,是吗?
这只是供参考:如果我们填写像"N/A"这样的值,我们会收到客户在我们网站上的投诉。大多数人似乎更喜欢看到空格,这也会简化代码:
lblVariable.Text = string.Format("{0}", Session["Variable"]);
变量,显然,需要更改您的会话和控制变量的名称。