步骤1：创建新的ContentPage示例名称ButtonStyles.xaml
步骤2：编辑

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="YourAppName.ButtonStyles"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">

    ...

</ContentPage>

字符串
到

<?xml version="1.0" encoding="utf-8" ?>
<ResourceDictionary
    x:Class="YourAppName.ButtonStyles"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">

    ....

</ResourceDictionary>

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在CodeBehind中

using Xamarin.Forms.Internals;
[Preserve(AllMembers = true)]
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class ButtonStyles
    {
        public ButtonStyles()
        {
            InitializeComponent();
        }
    }

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步骤3：将样式放入ButtonStyles.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ResourceDictionary
    x:Class="YourAppName.ButtonStyles"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">

    <Style x:Key="MyStyleButton" TargetType="Button">
        <Setter Property="BackgroundColor" Value="#2196f3" />
        <Setter Property="WidthRequest" Value="300" />
        <Setter Property="CornerRadius" Value="20" />
        <Setter Property="FontSize" Value="Medium" />
        <Setter Property="TextColor" Value="White" />
    </Style>

    <Style x:Key="MyStyleButton2" TargetType="Button">
        .....
    </Style>

</ResourceDictionary>

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步骤4：在您的App.xaml

<?xml version="1.0" encoding="utf-8" ?>
<Application
    x:Class="YourAppName.App"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:YourAppName;assembly=YourAppName">

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <local:ButtonStyles />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>

</Application>

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第5步：在任何ContentPages中

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="YourAppName.MainPage"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">

    <StackLayout>
        <Button
            Command="{Binding Command1}"
            Style="{StaticResource MyStyleButton}"
            Text="Button1" />
        <Button
            Command="{Binding Command2}"
            Style="{StaticResource MyStyleButton}"
            Text="Button2" />
        <Button
            Command="{Binding Command3}"
            Style="{StaticResource MyStyleButton}"
            Text="Button3" />
    </StackLayout>

</ContentPage>

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你也可以把它放在Application.Resources中，在每个页面中使用它。https://learn.microsoft.com/en-us/xamarin/xamarin-forms/xaml/resource-dictionaries
单位：App.xaml

<Application.Resources>
    <Style x:Key="MyStyleButton" TargetType="Button">
        <Setter Property="BackgroundColor" Value="#2196f3" />
        <Setter Property="WidthRequest" Value="300" />
        <Setter Property="CornerRadius" Value="20" />
        <Setter Property="FontSize" Value="Medium" />
        <Setter Property="TextColor" Value="White" />
    </Style>
</Application.Resources>

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在您喜欢的任何页面中使用

<ContentPage.Content>
    <StackLayout>
        <Button
            Command="{Binding Command1}"
            Style="{StaticResource MyStyleButton}"
            Text="Button1" />   
    </StackLayout>
</ContentPage.Content>

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