我如何使用反射从文件后面的asp.net代码访问服务器端控件？

Question

For example, if i have on the aspx page:

<asp:PlaceHolder ID="tab_0" runat="server" Visible="false"></asp:PlaceHolder>
<asp:PlaceHolder ID="tab_1" runat="server" Visible="false"></asp:PlaceHolder>

and i want to access these properties in the code behind page using values from a configuration file for example

string enabledTabs = "0,1,2,3";

if there a way i can use reflection to set them to enabled or disabled eg

foreach(var id in enabledTabs.Split(',')) 
{
  // <use reflection to get the correct tab control>

  // Set property of the tab
  tab.Visible = true;
}

I could acheive the result i want by using a switch statement and setting the particular control property, but i'd like to use reflection to get the tab to make it cleaner.

Could anyone help?

Thanks!

Answer 1

You don't need reflection. Use Page.FindControl :

foreach(var id in enabledTabs.Split(','))
{
    PlaceHolder control = (PlaceHolder)this.FindControl("tab_"+id));
    control.Visible = true;
}

Answer 2

foreach(var id in enabledTabs.Split(',')) 
{      

    // Set property of the tab
    Page.FindControl("tab_" + id.ToString()).Visible = true;
}

Answer 3

请尝试以下操作：

Control tab = Control.FindControl("tab_"+id);