从母版页更改子页的文本

Question

I need to change text of header of child page from master page depending upon some logic. Below is my code in master page:

<div id="content-header">
    <h1>
        <asp:ContentPlaceHolder ID="cphHead" runat="server"></asp:ContentPlaceHolder>
    </h1>
</div>

In child page I have below code:

<asp:Content ID="Content3" ContentPlaceHolderID="cphHead" runat="Server">
  TEXT
</asp:Content>

How can I change value of TEXT to any other from master page?

Answer 1

You can search controls in the MasterPage. If you set text directly in your ContentPlaceHolder like your example, the text will be in a LiteralControl:

((LiteralControl)this.FindControl("cphHead").Controls[0]).Text = "Change TEXT";

Or if you want search to a control in the page control collection:

ControlCollection controls = this.FindControl("cphHead").Controls;

foreach (Control control in controls)
{
    if (control.GetType() == typeof(LiteralControl))
    {
        ((LiteralControl)control).Text = "Change TEXT";
        break;
    }
}