Question

c#使用foreach遍历textbox的问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
foreach (Control aa in Page.Controls)
{
if (aa is TextBox )
{
TextBox tb = (TextBox )aa;
tb.Text = "hello world!";
Page.ClientScript.RegisterStartupScript(this.GetType(), "1", "alert(hello)");
}
}

}
}

<%@ Page Title="主页" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</asp:Content>

这是我的代码，但是为什么不能给压面上的textbox成功遍历并赋值了，谁帮我看下啊。

Answer 1

在页面控件的外层 写一个 form 把这些控件包进去

<form id="form1" runat="server">。。。</form>

然后遍历的时候用

foreach (Control aa in form1.Controls)
{
}

就好了

Answer 2

终于出来了 。。。 没有写过这样的代码
protected void Button1_Click1(object sender, EventArgs e)
{
int nPageControls = Page.Controls.Count;
for (int i = 0; i < nPageControls; i++)
{
foreach (System.Web.UI.Control aa in Page.Controls[i].Controls)
{
if ( aa is TextBox)
{
TextBox tb = (TextBox)aa;
tb.Text = "hello world!";
//Page.ClientScript.RegisterStartupScript(this.GetType(), "1", "alert(hello)");
}
}
}
}

Answer 3

没按按钮吧