Accessing Master Page Controls in Non master page?

Question

在asp.net中，如何在非母版页中访问母版页控件？

Answer 1

You can access the Masterpage as a property on your current page. However, the controls on your master page are protected so you can't access them directly. But you can access them by using FindControl(string name) . The code you need to use depends on if the control is inside or outside a content place holder.

// Gets a reference to a TextBox control inside a ContentPlaceHolder
ContentPlaceHolder mpContentPlaceHolder;
TextBox mpTextBox;
mpContentPlaceHolder = 
    (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
if(mpContentPlaceHolder != null)
{
    mpTextBox = (TextBox) mpContentPlaceHolder.FindControl("TextBox1");
    if(mpTextBox != null)
    {
        mpTextBox.Text = "TextBox found!";
    }
}

// Gets a reference to a Label control that is not in a 
// ContentPlaceHolder control
Label mpLabel = (Label) Master.FindControl("masterPageLabel");
if(mpLabel != null)
{
    Label1.Text = "Master page label = " + mpLabel.Text;
}

Answer 2

add this in your webPage to access the contents of master page Master Page : programatically access

<%@ MasterType virtualpath="Your MasterPath" %>

you can do like this (alternative way )

MasterPage mstr 
Label lbl
mstr = Page.Master
If (mstr.ID == "yourMasterIDString")
{
     lbl = mstr.FindControl("lblBar")
        If (lbl !=null)
          {
                lbl.Text = "Do some Logic"
          }
}

Answer 3

Use can

TextBox txt1 = (TextBox)this.Master.FindControl("MytxtBox");
txt1.Text="Content Changed from content page";