Cómo hacer referencia a los controles de una MasterPage en ASP.NET

En este artículo veremos cómo hacer referencia a las propiedades de los controles de una página maestra desde nuestra página web.


Utilizaremos el método FindControl, para buscar y hacer referencia al control de la Página Maestra.

En el ejemplo siguiente se muestra el uso del método FindControl para obtener una referencia a dos controles de la página maestra, un control TextBox y un control Label. Dado que el control TextBox está dentro de un control ContentPlaceHolder, debe obtener primero una referencia a ContentPlaceHolder y, a continuación, utilizar su método FindControl para buscar el control TextBox.


Dim mpContentPlaceHolder As ContentPlaceHolder
    Dim mpTextBox As TextBox
    mpContentPlaceHolder = _
        CType(Master.FindControl("ContentPlaceHolder1"), _
    If Not mpContentPlaceHolder Is Nothing Then
        mpTextBox = CType(mpContentPlaceHolder. _
            FindControl("TextBox1"), TextBox)
        If Not mpTextBox Is Nothing Then
            mpTextBox.Text = "TextBox found!"
        End If
    End If

    ' Gets a reference to a Label control not in a 
    ' ContentPlaceHolder
    Dim mpLabel As Label
    mpLabel = CType(Master.FindControl("masterPageLabel"), Label)
    If Not mpLabel Is Nothing Then
        Label1.Text = "Master page label = " + mpLabel.Text
    End If


// Gets a reference to a TextBox control inside 
    // a ContentPlaceHolder
    ContentPlaceHolder mpContentPlaceHolder;
    TextBox mpTextBox;
    mpContentPlaceHolder = 
    if(mpContentPlaceHolder != null)
        mpTextBox = 
            (TextBox) mpContentPlaceHolder.FindControl("TextBox1");
        if(mpTextBox != null)
            mpTextBox.Text = "TextBox found!";
    // Gets a reference to a Label control that not in 
    // a ContentPlaceHolder
    Label mpLabel = (Label) Master.FindControl("masterPageLabel");
    if(mpLabel != null)
        Label1.Text = "Master page label = " + mpLabel.Text;


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12 Comentarios
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    Tuesday, May 26, 2015

    Referencia a objeto no establecida como instancia de un objeto.

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