Question

我不会在任何事情上使用主内容页面。我有一个简单的aspx页面。仍然显示

名称＆＃39; txtFirstName＆＃39;在当前上下文中不存在

我的MarkUp

<%@ 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 txtFirstName_TextChanged(object sender, EventArgs e)
    {
        string firstName = txtFirstName.Text;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
</head>
<body>
    <form id="form1" runat="server">
    <asp:TextBox ID="txtFirstName" runat="server" OnTextChanged="txtFirstName_TextChanged"></asp:TextBox>
    </form>
</body>
</html>

即使是OnTextChanged事件也正常启动。我不明白，可能是什么问题？

我搜索过的其他类似帖子并没有多大帮助。

请建议.....

Answer 1

您必须拥有form标记{/ 1}}

runat="Server"

注意： - 1）将脚本放在<form id="form1" runat="server"> <asp:TextBox ID="txtFirstName" runat="server" text="" AutoPostBack="True"/> </form> protected void txtFirstName_TextChanged(object sender, EventArgs e) { string firstName = txtFirstName.Text; }标记内..

<head>

Answer 2

尝试

<form runat="server">
    <asp:TextBox ID="txtFirstName" runat="server" text="" />
</form>

http://www.w3schools.com/aspnet/aspnet_textbox.asp

protected void txtFirstName_TextChanged(object sender, EventArgs e)
    {
        Button btn = sender as Button;
        string firstName = btn.Text;
    }

TextBox在当前上下文中不存在

2 个答案: