hallo,
ich habe ein problem mit der verwendung von SessionState. ausschnitte der wichtigsten
3 dateien habe ich hineinkopiert.
in WebForm1.aspx verwende ich das object-Tag um eine weitere datei zu "integrieren",
diese ist eigentlich eine SVG (Scaleable Verctor Graphics) Datei, die auch mit ASP.NET
"komplettiert" werden soll (Werte aus Datenbank).
in WebForm1.aspx.vb m�chte ich einen aus den 3 DropDownListen zusammengesetzten
Datumswert in Session("MyDatum") ablegen. die in WebForm1.aspx integrierte SVG-Datei
temperatur_svg.aspx (also das dort enthaltenen VB) soll Session("MyDatum") dann auch
verwenden, tut es aber nicht. wo liegt da der fehler ? ich dachte Session ist w�hrend
einer Session in allen Dateien bekannt.
Ich hoffe Ihr k�nnt mir bei diesem Problem weiter helfen.
Besten Dank
neblaz
P.S.
auch die Verwendung von IsPostBack in temperatur_svg.aspx geht nicht, das ding h�ngt
dann bis ich den Browser schlie�e.
*************
WebForm1.aspx
*************
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb"
Inherits="WebApplication1.WebForm1" enableViewState="True"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5";>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:Table id="Table1" style="Z-INDEX: 101; LEFT: 0px; POSITION: absolute; TOP: 0px"
runat="server" Width="465px" Height="480px" BorderWidth="0">
<asp:TableRow BorderWidth="0px" Height="395px">
<asp:TableCell>
<object data="temperatur_svg.aspx" width="480" height="395" type="image/svg+xml"
VIEWASTEXT>
</object>
</asp:TableCell>
</asp:TableRow>
<asp:TableRow Height="40px">
<asp:TableCell BackColor="Black">
<asp:DropDownList runat="server" Height="20px" Width="100px" ID="DropDownList2"
style="Z-INDEX: 103; LEFT: 93px; POSITION: absolute; TOP: 410px">
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
...
<asp:ListItem Value="30">30</asp:ListItem>
<asp:ListItem Value="31">31</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList runat="server" Height="20px" Width="100px" ID="DropDownList3"
style="Z-INDEX: 104; LEFT: 193px; POSITION: absolute; TOP: 410px">
<asp:ListItem Value="1">Januar</asp:ListItem>
<asp:ListItem Value="2">Februar</asp:ListItem>
...
<asp:ListItem Value="11">November</asp:ListItem>
<asp:ListItem Value="12">Dezember</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList runat="server" Height="20px" Width="100px" ID="DropDownList1"
style="Z-INDEX: 102; LEFT: 293px; POSITION: absolute; TOP: 410px">
<asp:ListItem Value="2002">2002</asp:ListItem>
<asp:ListItem Value="2003">2003</asp:ListItem>
</asp:DropDownList>
</asp:TableCell>
</asp:TableRow>
<asp:TableRow Height="35px">
<asp:TableCell BackColor="Black">
<asp:Button runat="server" Width="100px" ID="Button1" Height="25px" Text="Button"
style="Z-INDEX: 105; LEFT: 193px; POSITION: absolute; TOP: 445px"></asp:Button>
</asp:TableCell>
</asp:TableRow>
</asp:Table>
</form>
</body>
</HTML>
****************
WebForm1.aspx.vb
****************
Imports System.Data
Imports System.Data.OleDb
Public Class WebForm1
Inherits System.Web.UI.Page
Protected WithEvents Table1 As System.Web.UI.WebControls.Table
Protected WithEvents DropDownList2 As System.Web.UI.WebControls.DropDownList
Protected WithEvents DropDownList3 As System.Web.UI.WebControls.DropDownList
Protected WithEvents Button1 As System.Web.UI.WebControls.Button
Protected WithEvents DropDownList1 As System.Web.UI.WebControls.DropDownList
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Dim Datum As String
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles MyBase.Load
Dim MonatVolltext As String
Dim tmpDate As String
Dim dummy() As String
If Not IsPostBack Then
Datum = "#" + Now.Month.ToString + "/" + Now.Day.ToString + "/" + Now.Year.ToString +
"#"
Session("MyDatum") = Datum
DropDownList1.SelectedItem.Value = Now.Year
DropDownList1.SelectedItem.Text = Now.Year
DropDownList2.SelectedItem.Value = Now.Day
DropDownList2.SelectedItem.Text = Now.Day
DropDownList3.SelectedItem.Value = Now.Month
Select Case Now.Month
Case 1
MonatVolltext = "Januar"
Case 2
MonatVolltext = "Februar"
...
Case 12
MonatVolltext = "Dezember"
Case Else
End Select
DropDownList3.SelectedItem.Text = MonatVolltext
End If
End Sub
Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles
Button1.Click
Datum = "#" + DropDownList3.SelectedItem.Value + "/" +
DropDownList2.SelectedItem.Value + "/" + DropDownList1.SelectedItem.Value + "#"
Session("MyDatum") = Datum
End Sub
End Class
*******************
temperatur_svg.aspx
*******************
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd";>
<% @Page Language = "vb" %>
<% @Import Namespace = "System.Data" %>
<% @Import Namespace = "System.Data.OleDb" %>
<script runat = "server" >
...
Dim Datum as String
...
Sub ReadFromDatabase()
Datum = Session("MyDatum")
Dim ConnStr As String
ConnStr = "Provider=Microsoft.Jet.OLEDB.4.0;"
ConnStr &= "Data Source=C:\temp\WebApplication2\temperatur.mdb;"
Dim myOleDbConn As New OleDbConnection(ConnStr)
myOleDbConn.Open()
Dim SQL As String = "SELECT * FROM temperatur WHERE (((temperatur.datum) =" + Datum +
"));"
Dim myOleDbCmd as New OleDbCommand(SQL, myOleDbConn)
...
Sub Page_Load(sender As Object, e As EventArgs)
ReadFromDatabase
End Sub
</script>
...
<svg width="480" height="395">
<!-- black and white rectangles -->
<rect x="0" y="0" width="480" height="395"
fill="black" stroke="black" stroke-width="0"/>
...
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