我们可以从母版页访问内容页面控件吗？

Question

I have a master page which is used for several content pages. On every content page there is a user control. I want to call a method of that control on click of a button which is in the master page.

Is it possible?

Answer 1

You can do this to access content page control

protected void Button1_Click(object sender, EventArgs e)
{
    UserControl_Type uc1 = 
    (UserControl_Type)ContentPlaceHolder1.FindControl("UserControlId");
    if (uc1 != null)
    {
        uc1.Method();
    }
}

I think you should move UserControl to master page and access usercontrol method in button click in masterpage cs file. You can do following if there are are any content pages you dont want to show this user control

Using content place holders:

In Master Page: Add:

<asp:contentplaceholder id="UcControlPlaceHolder" runat="server">
<!-- User control here -->
</asp:contentplaceholder>

In Content Pages where you don't want to show UserControl add following tag and remove this tag from all content pages where you want UserControl to show:

<asp:Content ID="UcControlContent1" 
ContentPlaceHolderID="UcControlPlaceHolder" Runat="Server">    
</asp:Content>

Answer 2

I want to call method of that control on click of button which is on master page. Can it be possible???

Yes and no. If you're talking client-side then yes, you could invoke a method on a control via JavaScript. If you're talking server-side then no.

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However, I do have to ask, if the control is available on every content page, it's a very good candidate for existing on the master page yes? You can hide it if you don't need it in specific content pages.