How to get the margin value of control?

Question

In my metro, I set into the relative location of the control， in this time, i try to get the margin value of control, but the result is always zero.

How to i should do?

Answer 1

How are you setting the relative coordinates of the control?

If you set the margin like this in xaml

<Button Content="click" Margin="6" x:Name="myButton"></Button>

then you can retrieve the value in code like this:

            Thickness mg = myButton.Margin;
            double left = mg.Left;
            double right = mg.Right;
            double top = mg.Top;
            double bottom = mg.Bottom;

---

http://babaandthepigman.spaces.live.com/blog/

Answer 2

<Button Content="click"  x:Name="myButton"  HorizontalAlignment="Left"  VerticalAlignment="Top"></Button>    I use this style.

Answer 3

Hi Roy,

If you don't set the margin then I would expect it to be zero.

What is your real goal here? Are you looking for something other than the margin? If you are looking for the location of the control it is often set by an attached property from the container control, such as Canvas.LeftProperty or Grid.RowProperty. These can be queried from the button with GetValue:

int x = myButton.GetValue(Canvas.LeftProperty);
int y = myButton.GetValue(Canvas.TopProperty);

--Rob

Answer 4

Hi Rob,  i found that still can't get the value. My code is as follows:

XML:

<Grid Background="{StaticResource ApplicationPageBackgroundBrush}">
        <Button Content="Button" HorizontalAlignment="Right" Height="54" VerticalAlignment="Bottom" Width="168" Background="#00E47D7D" x:Name="XBtn"/>
</Grid>

c#:

public BlankPage()
{
            this.InitializeComponent();
            Debug.WriteLine("=================>>" + XBtn.GetValue(Canvas.LeftProperty));
}

The result is still zero.

Answer 5

Hi Roy,

Zero is still expected: your button isn't in a Canvas and doesn't have the Left property set. If the location isn't set then you cannot read it out.

--Rob

Answer 6

If your Button is inside of a grid - setting Canvas.Left on it has no effect and the default value for Canvas.LeftProperty is 0, so that is what you get.

You can access the Margin property in your BlankPage constructor by just getting XBtn.Margin value, but in your case it will still return the default Thickness-type value (left: 0, top: 0, right: 0, bottom: 0), since you never set it to anything.

If you put your button inside of a single-cell Grid  - the button will be positioned based on Horizontal/Vertical-Alignment as well as the Margin. You can replace your Grid with a Canvas and then use Canvas.Left/Canvas.Top for controlling the layout.

---

Filip Skakun

Answer 7

<Grid>

<ButtonContent="click"x:Name="myButton"  HorizontalAlignment="Left"  VerticalAlignment="Top"></Button>

</Grid>

if this is the case, i can't get the position value of myButton?

Other way?

Answer 8

Hi Roy,

What exactly do you mean by position? Why do you need this? What do you plan to do with the position once you find it?

In order to get the position the button needs to be in a control which supports position and then have a position set on it that can be queried.

Depending on why exactly you need the position you may want to look at TransformToVisual instead.

--Rob