前两天同事让我帮他解决一个问题,大体就是在页面中通过控件ID找到并修改DataGrid中的一个DropDownList的SelectedValue,他通过Page.FindControl无法找到。记得以前发现过这个问题,以前就是通过在Page控件树中递归查找解决的,今天顺便对asp.net的Page控件树结构研究了一下。
下面是我递归查找的函数:
<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>
![](https://www.cnblogs.com/images/cnblogs_com/end/page.gif)
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。
下面是我递归查找的函数:
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public object Myfindcontrol(Control parentcontrols,string id)
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{
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for (int i = 0; i < parentcontrols.Controls.Count; i++)
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{
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if (parentcontrols.Controls[i].ClientID == id)
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return parentcontrols.Controls[i];
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else if (parentcontrols.Controls[i].Controls.Count > 0)
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{
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if(Myfindcontrol(parentcontrols.Controls[i], id)!=null)
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return Myfindcontrol(parentcontrols.Controls[i], id);
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}
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}
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return null;
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}
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![](https://www.cnblogs.com/images/cnblogs_com/end/page.gif)
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。