ASP.NET Tutorial/Page Lifecycle/Cross Page Posting

Содержание

1 Cross-page post (VB.net)
2 Exposing the values of the control from a Property
3 New Cross-Page Posting
4 Page.IsCrossPagePostBack
5 Page level property (VB.net)
6 PreviousPageType directive

Cross-page post (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
       Label1.Text = "Hello " & TextBox1.Text & "
" & "Date Selected: " & Calendar1.SelectedDate.ToShortDateString()
   End Sub

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>First Page</title>

</head> <body>

   <form id="form1" runat="server">
       Enter your name:

       <asp:Textbox ID="TextBox1" Runat="server"/>
       When do you want to fly?

       <asp:Calendar ID="Calendar1" Runat="server"/>
       

       <asp:Button ID="Button1" Runat="server" Text="Submit page to itself" 
        OnClick="Button1_Click" />
       <asp:Button ID="Button2" Runat="server" Text="Submit page to NextPage.aspx"
        PostBackUrl="NextPage.aspx" />
       <asp:Label ID="Label1" Runat="server"/>
   </form>

</body> </html>

File: NextPage.aspx <%@ Page Language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
       Dim myTextbox1 As TextBox
       Dim myCalendar1 As Calendar
       
       myTextbox1 = CType(PreviousPage.FindControl("Textbox1"), TextBox)
       myCalendar1 = CType(PreviousPage.FindControl("Calendar1"), Calendar)
       
       Label1.Text = "Hello " & myTextbox1.Text & "
" & _
           "Date Selected: " & myCalendar1.SelectedDate.ToShortDateString()
   End Sub

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Second Page</title>

</head> <body>

   <form id="form1" runat="server">
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html></source>

Exposing the values of the control from a Property

   <source lang="csharp">

index.aspx

<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   public TextBox pp_TextBox1
   {
       get
       {
           return TextBox1;
       }
   }
   public Calendar myCalendar1
   {
       get
       {
           return Calendar1;
       }
   }
   protected void Button1_Click (object sender, System.EventArgs e)
   {
       Label1.Text = "Hello " + TextBox1.Text + "
" +
           "Date Selected: " + Calendar1.SelectedDate.ToShortDateString();
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>First Page</title>

</head> <body>

   <form id="form1" runat="server">
       Enter your name:

       <asp:Textbox ID="TextBox1" Runat="server">
       </asp:Textbox>
       When do you want to fly?

       <asp:Calendar ID="Calendar1" Runat="server"></asp:Calendar>
       

       <asp:Button ID="Button1" Runat="server" Text="Submit page to itself" 
        OnClick="Button1_Click" />
       <asp:Button ID="Button2" Runat="server" Text="Submit page to NextPage.aspx"
        PostBackUrl="NextPage.aspx" />
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html> File: NextPage.aspx

<%@ Page Language="C#" %> <%@ PreviousPageType VirtualPath="Default.aspx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"

"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

   protected void Page_Load(object sender, System.EventArgs e)
   {
     if (Page.IsCrossPagePostBack) {
       Label1.Text = "Hello " + PreviousPage.myTextbox1.Text + "
" + 
          "Date Selected: " + 
          PreviousPage.myCalendar1.SelectedDate.ToShortDateString();
     }
     else
     {
        Response.Redirect("Default.aspx");
     }
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Second Page</title>

</head> <body>

   <form id="form1" runat="server">
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html></source>

New Cross-Page Posting

   <source lang="csharp">

<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   protected void Button1_Click (object sender, System.EventArgs e)
   {
       Label1.Text = "Hello " + TextBox1.Text + "
" +
           "Date Selected: " + Calendar1.SelectedDate.ToShortDateString();
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>First Page</title>

</head> <body>

   <form id="form1" runat="server">
       Enter your name:

       <asp:Textbox ID="TextBox1" Runat="server"/>
       When do you want to fly?

       <asp:Calendar ID="Calendar1" Runat="server"></asp:Calendar>
       

       <asp:Button ID="Button1" 
                   Runat="server" 
                   Text="Submit page to itself" 
                   OnClick="Button1_Click" />
       <asp:Button ID="Button2" 
                   Runat="server" 
                   Text="Submit page to NextPage.aspx"
                   PostBackUrl="NextPage.aspx" />
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html> File: NextPage.aspx <%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   protected void Page_Load(object sender, System.EventArgs e)
   {
       TextBox myTextbox1;
       Calendar myCalendar1;
       
       myTextbox1 = (TextBox)PreviousPage.FindControl("Textbox1");
       myCalendar1 = (Calendar)PreviousPage.FindControl("Calendar1");
       
       Label1.Text = "Hello " + myTextbox1.Text + "
" + "Date Selected: " + myCalendar1.SelectedDate.ToShortDateString();
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Second Page</title>

</head> <body>

   <form id="form1" runat="server">
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html></source>

Page.IsCrossPagePostBack

   <source lang="csharp">

index.aspx

<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

   public TextBox pp_TextBox1
   {
       get
       {
           return TextBox1;
       }
   }
   public Calendar myCalendar1
   {
       get
       {
           return Calendar1;
       }
   }
   protected void Button1_Click (object sender, System.EventArgs e)
   {
       Label1.Text = "Hello " + TextBox1.Text + "
" +
           "Date Selected: " + Calendar1.SelectedDate.ToShortDateString();
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>First Page</title>

</head> <body>

   <form id="form1" runat="server">
       Enter your name:

       <asp:Textbox ID="TextBox1" Runat="server">
       </asp:Textbox>
       When do you want to fly?

       <asp:Calendar ID="Calendar1" Runat="server"></asp:Calendar>
       

       <asp:Button ID="Button1" Runat="server" Text="Submit page to itself" 
        OnClick="Button1_Click" />
       <asp:Button ID="Button2" Runat="server" Text="Submit page to NextPage.aspx"
        PostBackUrl="NextPage.aspx" />
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html> File: NextPage.aspx

<%@ Page Language="C#" %> <%@ PreviousPageType VirtualPath="Default.aspx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"

"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

   protected void Page_Load(object sender, System.EventArgs e)
   {
     if (Page.IsCrossPagePostBack) {
       Label1.Text = "Hello " + PreviousPage.myTextbox1.Text + "
" + 
          "Date Selected: " + 
          PreviousPage.myCalendar1.SelectedDate.ToShortDateString();
     }
     else
     {
        Response.Redirect("Default.aspx");
     }
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Second Page</title>

</head> <body>

   <form id="form1" runat="server">
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html></source>

Page level property (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

  Public ReadOnly Property pp_TextBox1() As TextBox
      Get
          Return TextBox1
      End Get
  End Property
   
  Public ReadOnly Property myCalendar1() As Calendar
      Get
          Return Calendar1
      End Get
  End Property
   
  Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
      Label1.Text = "Hello " & TextBox1.Text & "
" & _
          "Date Selected: " & Calendar1.SelectedDate.ToShortDateString()
  End Sub

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>First Page</title>

</head> <body>

   <form id="form1" runat="server">
       Enter your name:

       <asp:Textbox ID="TextBox1" Runat="server">
       </asp:Textbox>
       When do you want to fly?

       <asp:Calendar ID="Calendar1" Runat="server"/>
       

       <asp:Button ID="Button1" Runat="server" Text="Submit page to itself" 
        OnClick="Button1_Click" />
       <asp:Button ID="Button2" Runat="server" Text="Submit page to NextPage.aspx"
        PostBackUrl="NextPage.aspx" />
       <asp:Label ID="Label1" Runat="server"/>
   </form>

</body> </html> File: NextPage.aspx <%@ Page Language="VB" %> <%@ PreviousPageType VirtualPath="Default.aspx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"

"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
       Label1.Text = "Hello " & PreviousPage.myTextbox1.Text & "
" & _
           "Date Selected: " & _
           PreviousPage.myCalendar1.SelectedDate.ToShortDateString()
   End Sub

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Second Page</title>

</head> <body>

   <form id="form1" runat="server">
       <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>

</body> </html></source>

PreviousPageType directive

   <source lang="csharp">

<%@ Page Language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">

  Public ReadOnly Property pp_TextBox1() As TextBox
      Get
          Return TextBox1
      End Get
  End Property
   
  Public ReadOnly Property myCalendar1() As Calendar
      Get
          Return Calendar1
      End Get
  End Property
   
  Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
      Label1.Text = "Hello " & TextBox1.Text & "
" & _
          "Date Selected: " & Calendar1.SelectedDate.ToShortDateString()
  End Sub

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>First Page</title>

</head> <body>

   <form id="form1" runat="server">
       Enter your name:

       <asp:Textbox ID="TextBox1" Runat="server"/>
       
       When do you want to fly?

       <asp:Calendar ID="Calendar1" Runat="server"/>
       

       <asp:Button ID="Button1" Runat="server" Text="Submit page to itself" 
        OnClick="Button1_Click" />
       <asp:Button ID="Button2" Runat="server" Text="Submit page to NextPage.aspx"
        PostBackUrl="NextPage.aspx" />
       <asp:Label ID="Label1" Runat="server"/>
   </form>

</body> </html> File: NextPage.aspx <%@ Page Language="VB" %> <%@ PreviousPageType VirtualPath="Default.aspx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"

"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
     If Page.IsCrossPagePostBack Then
       Label1.Text = "Hello " & PreviousPage.myTextbox1.Text & "
" & _
           "Date Selected: " & _
           PreviousPage.myCalendar1.SelectedDate.ToShortDateString()
     Else
           Response.Redirect("Default.aspx")
     End If
   End Sub

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Second Page</title>

</head> <body>

   <form id="form1" runat="server">
       <asp:Label ID="Label1" Runat="server"/>
   </form>

</body> </html></source>

ASP.NET Tutorial/Page Lifecycle/Cross Page Posting

Содержание

Cross-page post (VB.net)

Exposing the values of the control from a Property

New Cross-Page Posting

Page.IsCrossPagePostBack

Page level property (VB.net)

PreviousPageType directive

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