asp.net CROSS-PAGE POSTING

有两个页面page1和page2。page1中有两个按钮

<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" />

Button1 post给自己、Button2 post给page2,注意到Button2没有OnClick事件。而是PostBackUrl属性来说明他要提交到哪一页。如下图所示

在page2中如何获取page1中页面的值呢？代码如下

protected void Page_Load(object sender, 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();
    }

这样在page2的page_load事件中就可以获取到page1中两个控件的值。当然也可以通过下面判断当前回发是自身控件引起的还是其他页面post过来的。

The  IsCrossPagePostBack property enables you to check
whether the request is from  Page1.aspx

if (PreviousPage != null && PreviousPage.IsCrossPagePostBack)