参考前一篇,http://www.cnblogs.com/insus/archive/2012/09/23/2698613.html 没有达到用户的要求,用户要求是每点击一次添加铵钮,产生一个新的文本框TextBox,在文本框输入一些值之后,点击获取文本框值的铵钮,能取得刚才在文本框的值。首先看看修改之后的效果:
xxx.aspx:在网页中,拉一个动态添加文本框装载的容器PlaceHolder,和两个铵钮,一个是添加,另一个是获取值。

<
asp:PlaceHolder
ID
="PlaceHolder1"
runat
="server"
></
asp:PlaceHolder
>
< br />
< asp:Button ID ="ButtonAdd" runat ="server" Text ="Add TextBox" OnClick ="ButtonAdd_Click" />
< asp:Button ID ="ButtonGetValue" runat ="server" Text ="GetTextValue" OnClick ="ButtonGetValue_Click" />
< br />
< asp:Button ID ="ButtonAdd" runat ="server" Text ="Add TextBox" OnClick ="ButtonAdd_Click" />
< asp:Button ID ="ButtonGetValue" runat ="server" Text ="GetTextValue" OnClick ="ButtonGetValue_Click" />
为了记录添加的次数,我们需要写一个属性,记得点击次数。

protected
int TotalControls
{
get
{
return ViewState[ " TotControls "] == null ? 0 : ( int)(ViewState[ " TotControls "]);
}
set
{
ViewState[ " TotControls "] = value;
}
}
{
get
{
return ViewState[ " TotControls "] == null ? 0 : ( int)(ViewState[ " TotControls "]);
}
set
{
ViewState[ " TotControls "] = value;
}
}
写一个方法,动态产生文本框,方法有一个参数,就是传入将要产生的次数。

private
void DymanicallyGenerateTextBoxControl(
int totalControls)
{
TextBox tb = new TextBox();
tb.ID = " TextBox " + totalControls;
this.PlaceHolder1.Controls.Add(tb);
}
{
TextBox tb = new TextBox();
tb.ID = " TextBox " + totalControls;
this.PlaceHolder1.Controls.Add(tb);
}
网页一加载时,Page_Load事件中,判断计数器为多少,循环产生文本框。

protected
void Page_Load(
object sender, EventArgs e)
{
for ( int i = 0; i < TotalControls; i++)
{
DymanicallyGenerateTextBoxControl(i + 1);
}
}
{
for ( int i = 0; i < TotalControls; i++)
{
DymanicallyGenerateTextBoxControl(i + 1);
}
}
Click事件:

protected
void ButtonAdd_Click(
object sender, EventArgs e)
{
TotalControls = TotalControls + 1;
DymanicallyGenerateTextBoxControl(TotalControls);
}
{
TotalControls = TotalControls + 1;
DymanicallyGenerateTextBoxControl(TotalControls);
}
最后是获取文本框值的铵钮Click事件:

protected
void ButtonGetValue_Click(
object sender, EventArgs e)
{
foreach (Control ctl in this.PlaceHolder1.Controls)
{
if (ctl is TextBox)
Response.Write(((TextBox)ctl).Text.Trim () + " <br/> ");
}
}
{
foreach (Control ctl in this.PlaceHolder1.Controls)
{
if (ctl is TextBox)
Response.Write(((TextBox)ctl).Text.Trim () + " <br/> ");
}
}