有以下两个页面Default.aspx和Result.aspx,代码如下:
<!-- Default.aspx -->
<%@ Page Language="C#" AutoEventWireup="true" MasterPageFile="~/Default.master" CodeFile="Default.aspx.cs" Inherits="_Default" %><asp:Content ID="Content1" runat="server" ContentPlaceHolderID="ContentPlaceHolder1">
<asp:Label ID="Label1" runat="server" Text="Please input a string here"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" PostBackUrl="~/Result.aspx" /></asp:Content>//Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
//using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
}<!-- Result.aspx -->
<%@ Page Language="C#" MasterPageFile="~/Default.master" AutoEventWireup="true" CodeFile="Result.aspx.cs" Inherits="Result" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Label ID="Label1" runat="server" Text="The string you input in the previous page is"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</asp:Content>//Result.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class Result : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (PreviousPage != null)
{
TextBox tb = (TextBox)PreviousPage.FindControl("TextBox1");
if (tb != null)
TextBox1.Text = tb.Text;
}
}
}这两个页面都指定了MasterPageFile属性。因为该MasterPage中的内容无关紧要,就不列出来了。在Default.aspx上有Button1,其PostBackUrl指向Result.aspx。在Result.aspx.cs的Page_Load方法中尝试在TextBox1中显示用户在Default.aspx的TextBox1中输入的内容。当执行以下语句时:TextBox tb = (TextBox)PreviousPage.FindControl("TextBox1");tb始终为null。将以上语句更改为如下代码:Content con = (Content)PreviousPage.FindControl("Content1");
if (con == null)
return;TextBox tb = (TextBox)con.FindControl("TextBox1");但con始终为null,这样后续的语句也不可能执行了。我应该怎样在Result.aspx中找到Default.aspx页面上的TextBox1?谢谢!
<!-- Default.aspx -->
<%@ Page Language="C#" AutoEventWireup="true" MasterPageFile="~/Default.master" CodeFile="Default.aspx.cs" Inherits="_Default" %><asp:Content ID="Content1" runat="server" ContentPlaceHolderID="ContentPlaceHolder1">
<asp:Label ID="Label1" runat="server" Text="Please input a string here"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" PostBackUrl="~/Result.aspx" /></asp:Content>//Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
//using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
}<!-- Result.aspx -->
<%@ Page Language="C#" MasterPageFile="~/Default.master" AutoEventWireup="true" CodeFile="Result.aspx.cs" Inherits="Result" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Label ID="Label1" runat="server" Text="The string you input in the previous page is"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</asp:Content>//Result.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class Result : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (PreviousPage != null)
{
TextBox tb = (TextBox)PreviousPage.FindControl("TextBox1");
if (tb != null)
TextBox1.Text = tb.Text;
}
}
}这两个页面都指定了MasterPageFile属性。因为该MasterPage中的内容无关紧要,就不列出来了。在Default.aspx上有Button1,其PostBackUrl指向Result.aspx。在Result.aspx.cs的Page_Load方法中尝试在TextBox1中显示用户在Default.aspx的TextBox1中输入的内容。当执行以下语句时:TextBox tb = (TextBox)PreviousPage.FindControl("TextBox1");tb始终为null。将以上语句更改为如下代码:Content con = (Content)PreviousPage.FindControl("Content1");
if (con == null)
return;TextBox tb = (TextBox)con.FindControl("TextBox1");但con始终为null,这样后续的语句也不可能执行了。我应该怎样在Result.aspx中找到Default.aspx页面上的TextBox1?谢谢!
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