在一个页面中使用两个面板

Question

我一直在为我的最后一年项目做一个简单的网站，我想创建一个使用 Winforms 的预订系统。我想通过插入客户选择的座位数进行预订。当客户输入目的地和日期时，他/她将看到第一个面板，然后单击IbNext之后选择座位，这将引导第二个面板，客户必须输入姓名和电话。但就我而言，第二个面板永远不会被触发，我在意识到第二个面板永远不会为真时调试了一行。我不知道怎么了。拜托，我需要帮助。

public partial class _Default : System.Web.UI.Page
{
SqlCommand cmd;
SqlDataReader rea;
SqlDataReader read;

protected void Page_Load(object sender, EventArgs e)
{
seattable.Visible = false;
ibnext.Visible = false;
txtname.Focus();
}

protected void departon_SelectedIndexChanged(object sender, EventArgs e)
{
if (departon.SelectedItem.Text.ToString() == "--Select--")
{
DepartureTime.Items.Clear();
}
else
{
DepartureTime.Items.Clear();
string connString = ConfigurationManager.ConnectionStrings["MyDatabase1"].ConnectionString;
SqlConnection conn = new SqlConnection(connString);
conn.Open();
string strsql = "Select * from TimeTable where Station_name = '" + Destination.SelectedItem.Text.ToString() + "'";
SqlCommand cmd = new SqlCommand(strsql, conn);
SqlDataReader rea;
System.DateTime jtime = new DateTime();
cmd.CommandText = strsql;
rea = cmd.ExecuteReader();
DepartureTime.Items.Add("--Select--");
while (rea.Read())
{
jtime = System.DateTime.Parse(rea["Time"].ToString());
if (departon.SelectedItem.Text.ToString() == System.DateTime.Today.ToShortDateString())
{
if (jtime > System.DateTime.Now)
{
DepartureTime.Items.Add(rea["Time"].ToString());
}
}
else
{
DepartureTime.Items.Add(rea["Time"].ToString());
}
}
conn.Close();
}
}
protected void Destination_SelectedIndexChanged(object sender, EventArgs e)
{
departon.Items.Clear();
departon.Items.Add("--Select--");
departon.Items.Add(System.DateTime.Today.ToShortDateString());
departon.Items.Add(System.DateTime.Now.AddDays(1.00).ToShortDateString());
departon.Items.Add(System.DateTime.Now.AddDays(2.00).ToShortDateString());
departon.Items.Add(System.DateTime.Now.AddDays(3.00).ToShortDateString());
departon.Items.Add(System.DateTime.Now.AddDays(4.00).ToShortDateString());
departon.Items.Add(System.DateTime.Now.AddDays(5.00).ToShortDateString());
}
protected void DepartureTime_SelectedIndexChanged(object sender, EventArgs e)
{
string connecString = ConfigurationManager.ConnectionStrings["MyDatabase1"].ConnectionString;
SqlConnection con = new SqlConnection(connecString);
if (DepartureTime.SelectedItem.Text.ToString() != "--Select--")
{
seattable.Visible = true;
DepartureTime.Enabled = false;
departon.Enabled = false;
Destination.Enabled = false;
Source.Enabled = false;
// display Rent
con.Open();
string strsq;
strsq="Select * from TimeTable where Station_name = '" + Destination.SelectedItem.Text.ToString() + "'";
SqlCommand cmmd = new SqlCommand(strsq, con);
cmmd.CommandText = strsq;
rea = cmmd.ExecuteReader();
if (rea.HasRows == true)
{
while (rea.Read())
{
litrent.Text = rea[2].ToString();
litrent1.Text = rea[2].ToString();
litbusnumber.Text = rea[5].ToString();
}
}
}  rea.Close();
con.Close();
string strsqle;
SqlDataReader rear;
con.Open();
strsqle= "Select * from States where ((date = '" + departon.SelectedItem.Text.ToString() + "') and (Time ='" + DepartureTime.SelectedItem.Text.ToString() + "')and (Station='" + Destination.SelectedItem.Text.ToString() + "'))";
SqlCommand cmo= new SqlCommand(strsqle,con);
// cmo.CommandText = strsqle;
rear = cmo.ExecuteReader();
while (rear.Read())
{
for (int j = 1; j <= 31; j++)
{
string s = "s" + j;
if (rear[s.ToString()].ToString() == "b")
{
ImageButton img = (ImageButton)pnl1.FindControl(s.ToString());
img.ImageUrl = "~/img/BoookedSeat.png";
img.Enabled = false;            
}
}
}
}
protected void ibnext_Click(object sender, ImageClickEventArgs e)
{
string[] str = txtseatnumber.Text.Split('s');
int len = str.Length - 1;
littotalseat.Text = len.ToString();
int z = len * int.Parse(litrent.Text.ToString());
littotalrent.Text = z.ToString();
Random rnd = new Random();
Random rnd1 = new Random();
///litpnr.Text = rnd.Next(50000).ToString(); to generate unique Ticket numbers 
litpnr.Text = rnd.Next(50000).ToString() + rnd1.Next(548775).ToString();
if (len == 0)
{
//  Label1.Text = "if";
pnl1.Visible = true;
pnl2.Visible = false;
btnSave.Visible = false;
Response.Redirect("Selectseat.aspx");
}
else
{
btnSave.Visible = true;
pnl1.Visible = false;
pnl2.Visible = true;
ibnext.Visible = false;
// Label1.Text = "else";
}

}
protected void seatClick(ImageButton btn)
{
ibnext.Visible = true;
if (btn.ImageUrl == "~/img/SelectedSeat.png")
{
seattable.Visible = true;
btn.ImageUrl = "~/img/AvailableSeat.png";
if (txtseatnumber.Text.IndexOf(btn.ID.ToString() + ",") > -1)
{
txtseatnumber.Text = txtseatnumber.Text.Replace(btn.ID.ToString() + ",", "");
}
else
{
txtseatnumber.Text = txtseatnumber.Text.Replace(btn.ID.ToString(), "");
}
}
else if (btn.ImageUrl == "~/img/AvailableSeat.png")
{
seattable.Visible = true;
btn.ImageUrl = "~/img/SelectedSeat.png";
if (txtseatnumber.Text.Trim().Length == 0)
{
txtseatnumber.Text = btn.ID.ToString();
}
else if (txtseatnumber.Text.Trim().EndsWith(","))
{
txtseatnumber.Text = txtseatnumber.Text + btn.ID.ToString();
}
else
{
txtseatnumber.Text = txtseatnumber.Text + "," + btn.ID.ToString();
}
}

}
protected void s1click(object sender, ImageClickEventArgs e)
{
seatClick(s1);
}
protected void s2click(object sender, ImageClickEventArgs e)
{
seatClick(s2);
}
protected void s6click(object sender, ImageClickEventArgs e)
{
seatClick(s6);
}
protected void s7click(object sender, ImageClickEventArgs e)
{
seatClick(s7);
}
// THE REST OF THE S METHODS ARE CUTT IT BCZ OF THE WORD COUNT
protected void btnSave_Click(object sender, ImageClickEventArgs e)
{

string connString = ConfigurationManager.ConnectionStrings["MyDatabase1"].ConnectionString;
SqlConnection conbal = new SqlConnection(connString);
conbal.Open();
string strsqlbal = "select * from Users where (Username='" + User.Identity.Name.ToString() + "')";
SqlCommand cmdbal = new SqlCommand(strsqlbal, conbal);
cmdbal.Connection = conbal;
cmdbal.CommandText = strsqlbal;
string[] forsave = txtseatnumber.Text.Split(',');
string strsql1= "select Count(*) from States where((Date='" + departon.SelectedItem.Text
+ "') and (Time= '" + DepartureTime.SelectedItem.Text
+ "') and (Station= '" + Destination.SelectedItem.Text
+ "'))";
object obj = cmdbal.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
string sqladd = "INSERT into States ([Date],[Time],Station) values('" + departon.SelectedItem.Text
+ "','" + DepartureTime.SelectedItem.Text
+ "','" + Destination.SelectedItem.Text + "')";
SqlCommand cmd1= new SqlCommand(sqladd, conbal);
cmd1.ExecuteNonQuery();
//ExecuteNonQuery(sqladd);
}

for (int j = 0; j <= forsave.Length - 1; j++)
{
if (forsave[j].ToString().Trim().Length > 0)
{
string strsql2= "Update States set " + forsave[j].ToString() + " = 'b'  where ((Date='" + departon.SelectedItem.Text.ToString()
+ "')and(Time='" + DepartureTime.Text.ToString()
+ "')and (Station= '" + Destination.SelectedItem.Text.ToString()
+ "'))";
SqlCommand cmd2 = new SqlCommand(strsql2, conbal);
// cmdbal.CommandText = "<New SQL Command>";
cmd2.ExecuteNonQuery();
}
}



string strsql3= "Insert Into passengerinfo values('" + litpnr.Text.ToString() + "','" + txtname.Text.ToString() + "'," + txtphone.Text.ToString() + ",'" + Destination.SelectedItem.Text.ToString() + "','" + Source.SelectedItem.Text.ToString() + "','" + departon.SelectedItem.Text.ToString() + "','" + DepartureTime.SelectedItem.Text.ToString() + "','" + littotalseat.Text.ToString() + "','" + txtseatnumber.Text.ToString() + "','" + littotalrent.Text.ToString() + "','" + User.Identity.Name.ToString() + "','Booked')";
SqlCommand cmd3= new SqlCommand(strsql3,conbal);
cmd3.ExecuteNonQuery();
Response.Cookies["destination"].Value = Destination.SelectedItem.Text.ToString();
Response.Cookies["pnr"].Value = litpnr.Text.ToString();
Response.Cookies["name"].Value = txtname.Text.ToString();
Response.Cookies["ph"].Value = txtphone.Text.ToString();
Response.Cookies["jodate"].Value = departon.SelectedItem.Text.ToString();
Response.Cookies["jotime"].Value = DepartureTime.SelectedItem.Text.ToString();
Response.Cookies["seatnum"].Value = txtseatnumber.Text.ToString();
Response.Cookies["totalseat"].Value = littotalseat.Text.ToString();
Response.Cookies["rent"].Value = littotalrent.Text.ToString();
Response.Cookies["busnumber"].Value = litbusnumber.Text.ToString();
Response.Redirect("print1.aspx");
}
//    else
//    {
//        lblerror.Text = "Unsufficient Balance to book ticket.";
//        //}
//    }
//}

}

Answer 1

将您的面板放入<asp:UpdatePanel>中，这意味着当您更改可见性时，它们应该显示和隐藏。您的代码应如下所示：

<asp:UpdatePanel runat="server" Id="upPanels" updateMode="conditional">
<ContentTemplate>
<panel Id="pnl1" runat="server">
<!-- contents -->
</panel>
<panel Id="pnl2" runat="server">
<!-- contents -->
</panel>
</ContentTemplate>
</asp:UpdatePanel>

在您的代码中，您需要调用upPanels.Update();来更新面板：

if (len == 0)
{
//  Label1.Text = "if";
pnl1.Visible = true;
pnl2.Visible = false;
btnSave.Visible = false;
}
else
{
btnSave.Visible = true;
pnl1.Visible = false;
pnl2.Visible = true;
ibnext.Visible = false;
// Label1.Text = "else";
}
upPanels.Update(); //update view

此外，您应该在 SQL 查询中使用用户输入的参数，这将防止 SQL 注入。SQL参数文档在这里