下面是我递归查找的函数：
1
public object Myfindcontrol(Control parentcontrols,string id)
2
{
3
for (int i = 0; i < parentcontrols.Controls.Count; i++)
4
{
5 if (parentcontrols.Controls[i].ClientID == id)
6 return parentcontrols.Controls[i];
7 else if (parentcontrols.Controls[i].Controls.Count > 0)
8 {
9 if(Myfindcontrol(parentcontrols.Controls[i], id)!=null)
10 return Myfindcontrol(parentcontrols.Controls[i], id);
11
}
12 }
13 return null;
14
}
15
public object Myfindcontrol(Control parentcontrols,string id)2
{
3
for (int i = 0; i < parentcontrols.Controls.Count; i++)4
{
5
if (parentcontrols.Controls[i].ClientID == id)6
return parentcontrols.Controls[i];7
else if (parentcontrols.Controls[i].Controls.Count > 0)8
{9
if(Myfindcontrol(parentcontrols.Controls[i], id)!=null)10
return Myfindcontrol(parentcontrols.Controls[i], id);11
}12
}13
return null;14
}15
<html><body> <h1>Welcome to my Homepage!</h1> <form runat="server"> What is your name? <asp:TextBox runat="server" ID="txtName"></asp:TextBox> <br />What is your gender? <asp:DropDownList runat="server" ID="ddlGender"> <asp:ListItem Select="True" Value="M">Male</asp:ListItem> <asp:ListItem Value="F">Female</asp:ListItem> <asp:ListItem Value="U">Undecided</asp:ListItem> </asp:DropDownList> <br /> <asp:Button runat="server" Text="Submit!"></asp:Button> </form></body></html>
参考自创建动态数据输入用户界面 ，本想自己写些东西，突然发现人家讲的已经很好，偷懒一下吧。