ASP.Net/Request/Query String

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Deal with the query string (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Len(Request.QueryString("StoreID")) = 0 _
        or Len(Request.QueryString("ProductID")) = 0 Then
        lblMessage1.Text = "One or both of the fields " _
            & "StoreID or ProductID were not found in the " _
            & "QueryString collection!"
    Else
        lblMessage1.Text = "Store ID: " _
            & Request.QueryString("StoreID")
        lblMessage2.Text = "Product ID: " _
            & Request.QueryString("ProductID")
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>QueryString Sample Page</TITLE>
</HEAD>
<BODY >
<form runat="server">
<Font Face="Tahoma">
<asp:Label
    id="lblMessage1"
    runat="Server"
    Font-Bold="True"
/>
<BR><BR>
<asp:Label
    id="lblMessage2"
    runat="Server"
    Font-Bold="True"
/>
</Font>
</Form>
</BODY>
</HTML>



Get query string from Request (C#)

<%@ Page language="c#" src="QueryStringRecipient.aspx.cs" AutoEventWireup="false" Inherits="QueryStringRecipient" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:Label id="lblInfo" style="Z-INDEX: 101; LEFT: 26px; POSITION: absolute; TOP: 25px" runat="server" Width="412px" Height="130px" BorderStyle="Groove" BorderWidth="2px" Font-Bold="True" Font-Names="Verdana" Font-Size="Medium" BackColor="LightYellow"></asp:Label>&nbsp;
    </form>
  </body>
</HTML>

<%--
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class QueryStringRecipient : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Label lblInfo;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      lblInfo.Text = "Item: " + Request.QueryString["Item"];
      lblInfo.Text += "<br>Show Full Record: ";
      lblInfo.Text += Request.QueryString["Mode"];
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
  }

--%>



Send and get query string (C#)

<%@ Page language="c#" src="QueryStringSender.aspx.cs" AutoEventWireup="false" Inherits="QueryStringSender" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:ListBox id="lstItems" style="Z-INDEX: 101; LEFT: 21px; POSITION: absolute; TOP: 26px" runat="server" Width="204px" Height="188px"></asp:ListBox>
      <asp:CheckBox id="chkDetails" style="Z-INDEX: 102; LEFT: 24px; POSITION: absolute; TOP: 224px" runat="server" Width="216px" Height="16px" Text="Show Full Details"></asp:CheckBox>
      <asp:Button id="cmdGo" style="Z-INDEX: 103; LEFT: 24px; POSITION: absolute; TOP: 272px" runat="server" Width="152px" Text="View Information"></asp:Button>
      <asp:Label id="lblError" style="Z-INDEX: 104; LEFT: 304px; POSITION: absolute; TOP: 64px" runat="server" Width="312px" Height="96px"></asp:Label>
    </form>
  </body>
</HTML>

<%--
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class QueryStringSender : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.ListBox lstItems;
    protected System.Web.UI.WebControls.CheckBox chkDetails;
    protected System.Web.UI.WebControls.Button cmdGo;
    protected System.Web.UI.WebControls.Label lblError;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      // Add sample values.
      lstItems.Items.Add("A");
      lstItems.Items.Add("B");
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.cmdGo.Click += new System.EventHandler(this.cmdGo_Click);
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    private void cmdGo_Click(object sender, System.EventArgs e)
    {
      if (lstItems.SelectedIndex == -1)
      {
        lblError.Text = "You must select an item.";
      }
      else
      {
        string url = "QueryStringRecipient.aspx?";
        url += "Item=" + lstItems.SelectedItem.Text + "&";
        url += "Mode=" + chkDetails.Checked.ToString();
        Response.Redirect(url);
      }
    }
  }

--%>




<%-- QueryStringRecipient.aspx
<%@ Page language="c#" src="QueryStringRecipient.aspx.cs" AutoEventWireup="false" Inherits="QueryStringRecipient" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:Label id="lblInfo" style="Z-INDEX: 101; LEFT: 26px; POSITION: absolute; TOP: 25px" runat="server" Width="412px" Height="130px" BorderStyle="Groove" BorderWidth="2px" Font-Bold="True" Font-Names="Verdana" Font-Size="Medium" BackColor="LightYellow"></asp:Label>&nbsp;
    </form>
  </body>
</HTML>

//File: QueryStringRecipient.aspx.cs
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class QueryStringRecipient : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Label lblInfo;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      lblInfo.Text = "Item: " + Request.QueryString["Item"];
      lblInfo.Text += "<br>Show Full Record: ";
      lblInfo.Text += Request.QueryString["Mode"];
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
  }

--%>



Showing QueryString values via the QueryString Collection in ASP.NET

<%@ Page Language="vb" %>
<html>
   <head>
      <title>Showing QueryString values via the QueryString Collection in ASP.NET</title>
   </head>
<body>

<%
Dim Counter1, Counter2 As Integer
Dim Keys(), subKeys() As String
Dim MyQueryStringCollection As NameValueCollection
MyQueryStringCollection=Request.QueryString
Keys = MyQueryStringCollection.AllKeys
For Counter1 = 0 To Keys.GetUpperBound(0)
   Response.Write("Key: " & Keys(Counter1) & "<br>")
   subKeys = MyQueryStringCollection.GetValues(Counter1) " Get all values under this key.
   For Counter2 = 0 To subKeys.GetUpperBound(0)
      Response.Write("Value " & CStr(Counter2) & ": " & subKeys(Counter2) & "<br>")
   Next Counter2
Next Counter1
%>

</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Request/Query_String&oldid=2294»