WPF实现Loading条循环滚动效果

Loading动态滚动效果如下：

1、窗体xaml

<Window x:Class="LoadDemo.LoadWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="LoadWindow" Height="25" Width="450" 
        AllowsTransparency="True" Background="Transparent"
        WindowStartupLocation="CenterScreen" 
        WindowStyle="None"