Accessing masterpage properties from child pages in ASP.net VB
I have masterpage.master.vb where I have properties, such as;
Private _SQLerror As String
Public Property SQLerror() As String
Get
Return _SQLerror
End Get
Set(ByVal value As String)
_SQLerror = String.Empty
End Set
End Property
Then I have an aspx page in which I need to use this property in, such as;
If **[masterpage property sqlerror]** = Nothing Then
InternalSQLErrLabel.Text = ("No Errors Reported")
End I开发者_运维百科f
Can anyone give me an idea how to go about this? I've tried searching but most articles talk in the context of web controls...
Thanks.
Here you go:
How to: Reference ASP.NET Master Page Content
From the article, it looks like
If Master.SQLerror = Nothing Then
InternalSQLErrLabel.Text = ("No Errors Reported")
End If
should work for you.
Just be sure to add the MasterType directive as described or you might get a type conversion error. (Or you could use a variable of your master page type instead of Master, as daRoBBie suggests in his answer.)
I have created a test Web site just to test this out, and it works. Here is the full source of the site:
Site1.Master:
<%@ Master Language="VB" AutoEventWireup="false" CodeBehind="Site1.master.vb" Inherits="WebApplication1.Site1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
This is the Master Page content.
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
Site1.Master.vb:
Public Partial Class Site1
Inherits System.Web.UI.MasterPage
Private _SQLerror As String
Public Property SQLerror() As String
Get
Return _SQLerror
End Get
Set(ByVal value As String)
_SQLerror = String.Empty
End Set
End Property
End Class
WebForm1.aspx:
<%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/Site1.Master"
CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication1.WebForm1" %>
<%@ MasterType VirtualPath="~/Site1.Master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
This is the Content Page content.
<asp:Label ID="InternalSQLErrLabel" runat="server" Text="Label"></asp:Label>
</asp:Content>
WebForm1.aspx.vb:
Public Partial Class WebForm1
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Master.SQLerror = Nothing Then
InternalSQLErrLabel.Text = ("No Errors Reported")
End If
End Sub
End Class
you can cast the masterpage to the correct type:
MyMasterPageType m = (MyMasterPageType)Master;
Then you can access your properties:
m.SqlError
If you have multiple master pages, let all your masterpages inherit from an interface, and cast the masterpage to that interface.
You can use <%@ MasterType %> also for this.
If you have followed the steps in Andy West's answer and have one or many compile errors reading: Foo is not a member of 'System.Web.UI.MasterPage', make sure that they are the only compile error in your list. If there are any other compile errors that need to be fixed, they should be fixed before you continue troubleshooting your MasterPage.
These other compile errors may be preventing the compiler from parsing your MasterPage and detecting the extra properties. Once they are resolved, do a full recompile.
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