Find exact ASP.NET Type of page from inside a Master page

I'm trying to retrieve a custom Attribute set on a page's class from inside the MasterPage. Normally to do this I would need to reflect directly on the specific class, but inside the Master page it's always referred to as the Page type (the parent class).

How do I determine the specific type of the Page property?

Here's an example of what I'm trying to do:

Dim attrs() As Object = Page.GetType().GetCustomAttributes(GetType(MyCustomAttribute), False)
For Each attr As MyCustomAttribute In attrs
    ' Do something '
Next

but it only ever returns the attributes attached to the actual Page class.

I'd rather not have to derive a new base type from Page if I can avoid it.

Here is how my class is defined (in the code-behind):

<MyCustom()> _
Partial Class开发者_如何学Python PageClass

Am I defining this in the wrong place?

While Page was the actual type, it was a class representing the ASPX page rather than the partial class my attribute was attached to. To find the partial class I only had to do the following:

Page.GetType().BaseType

and used my attribute-finding code on that.

Thanks to TonyB and this SO question for pointing me in the right direction.

I think you are passing the wrong type to GetCustomAttributes

I added a label called "lblMP" to my master page and when I run this:

    protected void Page_Load(object sender, EventArgs e)
    {
        lblMP.Text = this.Page.GetType().AssemblyQualifiedName;

        foreach( var a in Attribute.GetCustomAttributes(this.Page.GetType()))
        {
            lblMP.Text = String.Format("{0} <br />{1}", lblMP.Text, a);
        }
    }

It correctly shows the custom attribute added to Default.aspx. Here is the output showing my "MPTesting.CustomAttribute" attribute.

ASP.default_aspx, App_Web_tkeebnzk, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
System.Runtime.CompilerServices.CompilerGlobalScopeAttribute
MPTesting.CustomAttribute
System.ComponentModel.DesignerAttribute
System.ComponentModel.ToolboxItemAttribute
System.ComponentModel.DefaultEventAttribute
System.ComponentModel.DesignerCategoryAttribute
System.ComponentModel.Design.Serialization.DesignerSerializerAttribute
System.ComponentModel.DesignerAttribute
System.ComponentModel.Design.Serialization.DesignerSerializerAttribute
System.ComponentModel.DefaultPropertyAttribute
System.ComponentModel.BindableAttribute
System.Web.UI.ThemeableAttribute
System.Web.UI,Require

You need to pass the page instance to the master page. I'd probably pass some kind of callback function to the master page from within the page class.