MainWindow.xaml

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<Window x:Class="Imageviewer.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <!--图片预览-->
        <Style x:Key="ImgButton" TargetType="{x:Type Button}">
            <Setter Property="Cursor" Value="Hand"></Setter>
            <Setter Property="Width" Value="35"></Setter>
            <Setter Property="Height" Value="30"></Setter>

            <Setter Property="Cursor" Value="Hand"></Setter>
        </Style>
        <Style x:Key="UndoStyle" TargetType="{x:Type Button}" BasedOn="{StaticResource ImgButton}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border>
                            <Image Name="img" Source="undo.png"></Image>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter  Property="Opacity"  Value="0.9"></Setter>
                            </Trigger>                     
                        </ControlTemplate.Triggers>

                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style x:Key="BigStyle" TargetType="{x:Type Button}" BasedOn="{StaticResource ImgButton}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border>
                            <Image Source="big.png"></Image>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter  Property="Opacity"  Value="0.9"></Setter>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>


        <Style x:Key="smallStyle" TargetType="{x:Type Button}" BasedOn="{StaticResource ImgButton}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border>
                            <Image Source="small.png"></Image>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter  Property="Opacity"  Value="0.9"></Setter>
                            </Trigger>