I've read that to increase performance you shouldn't set the value of a property within a layout if it's the same as the default value for a layout. As a simple example, if I had a StackLayout and I wanted it to be oriented vertically, I might write

<StackLayout
    Orientation="Vertical"
    >
</StackLayout>

but I know from experience that Vertical is the default orientation for a StackLayout and thus setting this value is redundant and will reduce performance.

What I don't know is the default value for many other properties such as Padding, Margin, HorizontalOptions, VerticalOptions and everything else, and for other layouts such as Grid.

Is there a simpler way to find these values that avoids trialing each layout with and without setting the values?

CodePudding user response：

You will find it mentioned in the Xamarin documentation or it API documentation, for instance:

• HorizontalOptions/VerticalOptions : default value is LayoutOptions.Fill.
• Padding : default is a Thickness type of 0 values.

If not mentioned in the documentation, you can look at the source code;:

• HorizontalOptions, VerticalOptions, Margin are View's properties you will find their declaration in View.cs.

• For StackLayout.Spacing you will find it in StackLayout.cs and so on.

CodePudding user response：

You could also double click the StackLayout in the Xaml to choose it. And then press F12 on keyboard. It would open a metadata for StackLayout.

In the comment of Orientation, the part of value would show the default.

    //
    // Summary:
    //     Gets or sets the value which indicates the direction which child elements are
    //     positioned.
    //
    // Value:
    //     A Xamarin.Forms.StackOrientation which indicates the direction children layouts
    //     flow. The default value is Vertical.
    //
    // Remarks:
    //     Setting the Orientation of a StackLayout triggers a layout cycle if the stack
    //     is already inside of a parent layout. To prevent wasted layout cycles, set the
    //     orientation prior to adding the StackLayout to a parent.