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MyControl.Margin.Left = 10; Error:
Cannot modify the return value of 'System.Windows.FrameworkElement.Margin' because it is not a variable
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Definition and Usage Two values, like: div {margin: 50px 10px} - the top and bottom margins will be 50px, left and right margins will be 10px. Three values, like: div {margin: 50px 10px 20px}- the top margin will be 50px, left and right margin will be 10px, bottom margin will be 20px.
The margin-right property in CSS is used to set the right margin of an element. It sets the margin-area on the right side of the element. Negative values are also allowed. The default value of margin-right property is zero.
Answer: You can set the margin property to auto to horizontally center the element within its container. The element will then take up the specified width, and the remaining space will be split equally between the left and right margins.
margin: 10px 5px 15px 20px; top margin is 10px.
The problem is that Margin is a property, and its type (Thickness) is a value type. That means when you access the property you're getting a copy of the value back.
Even though you can change the value of the Thickness.Left property for a particular value (grr... mutable value types shouldn't exist), it wouldn't change the margin.
Instead, you'll need to set the Margin property to a new value. For instance (coincidentally the same code as Marc wrote):
Thickness margin = MyControl.Margin; margin.Left = 10; MyControl.Margin = margin; As a note for library design, I would have vastly preferred it if Thickness were immutable, but with methods that returned a new value which was a copy of the original, but with one part replaced. Then you could write:
MyControl.Margin = MyControl.Margin.WithLeft(10); No worrying about odd behaviour of mutable value types, nice and readable, all one expression...
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