CODEWITHSUNDEEP
c#wpfcanvas
user10232725
user10232725

Reputation:

Can't find Attached Attributes in WPF

I'm new in WPF, but not in programming, I'm trying to find Attached Properties like ZIndex, Canvas.Top, Canvas.Left but it doesn't show me in C# code.

I can see all those properties in my XAML code, but cant reach them with my C# Code

 <Button Canvas.Left="192" Canvas.Top="102" Content="Button" Height="108" Name="button1" Width="173" /> <- XAML Part

  button1.Canvas.Top = 5; <- C# Part

it says button1 doesn't have any Canvas.Top method or Attribute.

Upvotes: 1

Views: 169

Answers (2)

ASh
ASh

Reputation: 35721

c# equivalent of xaml Canvas.Top attribute will be Canvas.TopProperty. Canvas.Top doesn't exist in c# code; in xaml it is recognized due to attached DP naming conventions.

Canvas.TopProperty can be set to any DependencyObject using SetValue method:

button1.SetValue(Canvas.TopProperty, 5.0);

Canvas.SetTop() internally uses SetValue() with Canvas.TopProperty. Canvas.SetTop() has an advantage of being type-safe. It accept double parameters, not object. E.g. button1.SetValue(Canvas.TopProperty, 5); throws ArgumentException, because 5 is int

Upvotes: 0

slow
slow

Reputation: 560

The Button itself doesn't have a Canvas. This should do it:

Canvas.SetTop(button1, 5);

and then:

canvas.Children.Add(button1);

Upvotes: 3

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