Question

On the top it says, “Gets or sets…”, so then why is it not letting me change it?

Answer 1

You can’t do this because although Margin.Left gets or sets, it’s not used like a variable. Just like Padding.

As you may notice, Margin (as for Padding) is a property and Thickness is its value. So, when you say

label1.Margin.Left = MainGrid.ActualHeight / 2 - label1.ActualHeight / 2;

you are only editing a copy (Margin) because Margin returns a struct (Thickness) . That’s why you receive an error. The changes are not saved because it’s a copy!

Basically, although you can change the value of Object.Margin.Left to a specific value yet it wouldn’t save/change the object Margin property and that’s why you get an error.

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For example

We can NOT say

label1.Margin.Left = MainGrid.ActualHeight / 2 - label1.ActualHeight /2;

but we can say

Thickness NewThickness = new Thickness(); //Initialize a new Thicnkess
NewThickness.Left = MainGrid.ActualHeight / 2 - label1.ActualHeight /2; //Set the left property of NewThickness
label1.Margin = NewThickness; //Apply the changes to label1

This means that, because Margin is a property, you are not allowed to change its Thickness directly.

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Alternatively, you can use the following which I believe to be easier to set a Margin of an object

label1.Margin = new Thickness(double left, double top, double right, double bottom);

Thanks,

I hope you find this helpful 🙂