总是报 未将对象引用设置到对象的实例,找不到错误 编译没问题。。帮我看看
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="onepage.aspx.cs" Inherits="onepage" ClassName="FirstPageClass" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>无标题页</title>
<script runat="server">
public string FirstName
{
get
{
return first.Text;
}
}
void ButtonClicked(object sender, EventArgs e)
{
Server.Transfer("twopage.aspx");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="first" runat="server"></asp:TextBox>
<asp:Button ID="Button1" OnClick="ButtonClicked" Text="Go to second page" runat="server" />
</div>
</form>
</body>
</html>
=======================
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="twopage.aspx.cs" Inherits="twopage" %>
<%@ Reference Page="~/onepage.aspx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>无标题页</title>
</head>
<script runat="server">
FirstPageClass fp; void Page_Load()
{
fp = (FirstPageClass)Context.Handler;
}
</script>
<body>
<form id="form1" runat="server">
<div>
b.aspx页面输出:<%=fp.FirstName%>
</div>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="onepage.aspx.cs" Inherits="onepage" ClassName="FirstPageClass" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>无标题页</title>
<script runat="server">
public string FirstName
{
get
{
return first.Text;
}
}
void ButtonClicked(object sender, EventArgs e)
{
Server.Transfer("twopage.aspx");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="first" runat="server"></asp:TextBox>
<asp:Button ID="Button1" OnClick="ButtonClicked" Text="Go to second page" runat="server" />
</div>
</form>
</body>
</html>
=======================
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="twopage.aspx.cs" Inherits="twopage" %>
<%@ Reference Page="~/onepage.aspx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>无标题页</title>
</head>
<script runat="server">
FirstPageClass fp; void Page_Load()
{
fp = (FirstPageClass)Context.Handler;
}
</script>
<body>
<form id="form1" runat="server">
<div>
b.aspx页面输出:<%=fp.FirstName%>
</div>
</form>
</body>
</html>
fp 应该是null
if (!IsPostBack)
{
fp = (FirstPageClass)Context.Handler;
}
<asp:Button ID="Button1" OnClick="ButtonClicked" Text="Go to second page" runat="server" />
被点击的时候Context.Handler 才是 FirstPageClass 的实例