Professional ASP.NET 2.0之跨页提交

先看代码
Listing 3-9: Page1.aspx
VB

<%@ Page Language=”VB” %>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN”

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

Protected Sub Button1_Click(ByVal sender As Object, _

ByVal e As System.EventArgs)

Label1.Text = “Hello “ & TextBox1.Text & “<br />” & _

“Date Selected: “ & Calendar1.SelectedDate.ToShortDateString()

End Sub

</script>

<title>First Page</title>

</head>

<body>

Enter your name:<br />

<asp:Textbox ID=”TextBox1” Runat=”server”>

</asp:Textbox>

<p>

When do you want to fly?<br />

<asp:Calendar ID=”Calendar1” Runat=”server”></asp:Calendar></p>

<br />

<asp:Button ID=”Button1” Runat=”server” Text=”Submit page to itself”

OnClick=”Button1_Click” />

<asp:Button ID=”Button2” Runat=”server” Text=”Submit page to Page2.aspx”

PostBackUrl=”Page2.aspx” />

<p>

<asp:Label ID=”Label1” Runat=”server”></asp:Label></p>

</form>

</body>

</html>

<%@ Page Language=”C#” %>

protected void Button1_Click (object sender, System.EventArgs e)

{

Label1.Text = “Hello “ + TextBox1.Text + “<br />” +

“Date Selected: “ + Calendar1.SelectedDate.ToShortDateString();

}

</script>

在Listing 3-9: Page1.aspx中，有两个button。两个button提交form到不同的位置。
第一个button提交form到自身，是ASP.NET 1.0/1.1的默认行为。这个button包含一个OnClick事件。
第二个button使用PostBackUrl属性，这个属性是一个string值，它指出了要提交到文件的位置－－Page2.aspx。

Listing 3-10: Page2.aspx
VB

<%@ Page Language=”VB” %>

<!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)

Dim pp_Textbox1 As TextBox

Dim pp_Calendar1 As Calendar

pp_Textbox1 = CType(PreviousPage.FindControl(“Textbox1”), TextBox)

pp_Calendar1 = CType(PreviousPage.FindControl(“Calendar1”), Calendar)

Label1.Text = “Hello “ & pp_Textbox1.Text & “<br />” & _

“Date Selected: “ & pp_Calendar1.SelectedDate.ToShortDateString()

End Sub

</script>

<title>Second Page</title>

</head>

<body>

<asp:Label ID=”Label1” Runat=”server”></asp:Label>

</form>

</body>

</html>

<%@ Page Language=”C#” %>

<!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)

{

TextBox pp_Textbox1;

Calendar pp_Calendar1;

pp_Textbox1 = (TextBox)PreviousPage.FindControl(“Textbox1”);

pp_Calendar1 = (Calendar)PreviousPage.FindControl(“Calendar1”);

Label1.Text = “Hello “ + pp_Textbox1.Text + “<br />” + “Date Selected: “ +

pp_Calendar1.SelectedDate.ToShortDateString();

}

</script>

有两种方法取得Page1.aspx中control的值：
第一种：如上Listing 3-10所示，使用PreviousPage的FindControl 方法，其中的字符串为Page1.aspx中control的id值。
第二种：如下Listing 3-11所示，为Page1.aspx中control建立属性。

Listing 3-11: Exposing the values of the control from a Property
VB

<%@ Page Language=”VB” %>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN”

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

Public ReadOnly Property pp_TextBox1() As TextBox

Get

Return TextBox1

End Get

End Property

Public ReadOnly Property pp_Calendar1() 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 & “<br />” & _

“Date Selected: “ & Calendar1.SelectedDate.ToShortDateString()

End Sub

</script>

<%@ Page Language=”C#” %>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN”

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

public TextBox pp_TextBox1

{

get

{

return TextBox1;

}

public Calendar pp_Calendar1

{

get

{

return Calendar1;

}

protected void Button1_Click (object sender, System.EventArgs e)

{

Label1.Text = “Hello “ + TextBox1.Text + “<br />” +

“Date Selected: “ + Calendar1.SelectedDate.ToShortDateString();

}

</script>

Listing 3-12: Consuming the exposed properties from the first page
VB

<%@ Page Language=”VB” %>

<%@ PreviousPageType VirtualPath=”Page1.aspx” %>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN”

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

Protected Sub Page_Load()Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

Label1.Text = “Hello “ & PreviousPage.pp_Textbox1.Text & “<br />” & _

“Date Selected: “ & _

PreviousPage.pp_Calendar1.SelectedDate.ToShortDateString()

End Sub

</script>

<%@ Page Language=”C#” %>

<%@ PreviousPageType VirtualPath=”Page1.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)

{

Label1.Text = “Hello “ + PreviousPage.pp_TextBox1.Text + “<br />” +

“Date Selected: “ +

PreviousPage.pp_Calendar1.SelectedDate.ToShortDateString();

}

</script>

为了使用Page1.aspx的属性，上面代码必须加入<%@ PreviousPageType VirtualPath=”Page1.aspx” %>，之后可以通过IntelliSense智能感看到PreviousPage属性。

注意：你仍能使用Page1.aspx中button的OnClick事件，这时先提交到Page1.aspx，然后再跨页面提交到Page2.aspx。

最后，怎么能知道请求来自于Page1.aspx，还是来自于Page2.aspx呢？
使用IsCrossPagePostBack属性

Listing 3-13: Using the IsCrossPagePostBack property
VB

<%@ Page Language=”VB” %>

<%@ PreviousPageType VirtualPath=”Page1.aspx” %>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN”

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

Protected Sub Page_Load()Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

If Page.IsCrossPagePostBack Then

Label1.Text = “Hello “ & PreviousPage.pp_Textbox1.Text & “<br />” & _

“Date Selected: “ & _

PreviousPage.pp_Calendar1.SelectedDate.ToShortDateString()

Else

Response.Redirect(“Page1.aspx”)

End If

End Sub

</script>

<%@ Page Language=”C#” %>

<%@ PreviousPageType VirtualPath=”Page1.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.pp_Textbox1.Text + “<br />” +

“Date Selected: “ +

PreviousPage.pp_Calendar1.SelectedDate.ToShortDateString();

}

else

{

Response.Redirect(“Page1.aspx”);

}

</script>

转载于:https://www.cnblogs.com/zhhui/archive/2006/03/20/354245.html

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