Entry在水平上下文中不采用LayoutOptions.StartAndExpand

Question

我想在水平Entry中使用展开 Button和StackLayout：

var item = new StackLayout { 
    Orientation = StackOrientation.Horizontal,
    HorizontalOptions = LayoutOptions.FillAndExpand,
    Children = {

        new Entry { 
            Placeholder = "Feldtitel",
            VerticalOptions = LayoutOptions.Center,
            HorizontalOptions = LayoutOptions.StartAndExpand // NOTE THIS
        },
        new Button{ 
            Text = CFieldDescription.getNameForFieldType( fieldType ),
            VerticalOptions = LayoutOptions.Center,
            HorizontalOptions = LayoutOptions.End
        }

    }};

虽然Entry位于开头，但Button已结束，Xamarin.Forms 并未更改Entry的大小以填充水平空间：

我需要更改我的代码吗？或者我发现了一个错误？

Answer 1

将Entry.HorizontalOptions更改为LayoutOptions.FillAndExpand以获得所需效果：

var item = new StackLayout { 
    Orientation = StackOrientation.Horizontal,
    HorizontalOptions = LayoutOptions.FillAndExpand,
    Spacing = 12, //you probably want this
    Children = {
        new Entry { 
            Placeholder = "Feldtitel",
            VerticalOptions = LayoutOptions.Center,
            HorizontalOptions = LayoutOptions.FillAndExpand //there, fixed
        },
        new Button{ 
            Text = CFieldDescription.getNameForFieldType( fieldType ),
            VerticalOptions = LayoutOptions.Center,
            HorizontalOptions = LayoutOptions.End
        }
    }};

看起来LayoutOptions需要一些好的文档。