可能是迄今为止最好用的WPF加载动画功能(没有之一)
前言当我们在开发应用程序时，用户体验往往是至关重要的一环。在应用程序加载大量数据或执行复杂操作时，为用户提供一个良好的加载体验变得至关重要。加载动画是其中一个有效的方式，它不仅能够告知用户应用程序正在进行工作，还能够缓解用户在等待过程中的焦虑感。
一.需求分析
开发一个加载动画比较常见的做法一般有以下两种。
一种是直接在控件的上层添加一层半透明遮罩，在遮罩上面显示加载动画，需要显示加载效果的时候将这个遮罩显示出来，加载完成以后隐藏这个遮罩，这种方式虽然也能实现需求，但是缺点也很明显，每次要使用加载效果的时候都需要单独添加遮罩代码，单独写控制显示和隐藏的代码，一个项目页面那么多，每次都这样整，那不得把人整崩溃了。
还有一种实现方式是开发一个控件，在这个控件当中实现遮罩的效果，然后用这个控件把页面内容包起来，这样直接控制这个控件的属性就能实现遮罩效果，这也是很多第三方控件库的实现方式。这种方式在易用性上虽然有所提升，但是还是有上面的问题，每个要用的地方都得Copy一次代码。
今天我们这里使用第三种方式，那就是使用装饰器来实现这个功能，它的优点就是对源代码侵入很小，不用每次使用都Copy大段代码，并且可扩展性非常强。
二.基本用法
以下为示例代码，当ViewModel中的IsLoading属性值为True时，就会触发Loading动画。
View代码：
<Window
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>x:Class="LoadingDemo.Views.MainWindow"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns:extensions="clr-namespace:LoadingDemo.Extensions"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns:prism="http://prismlibrary.com/"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>Title="Loading测试"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>Width="1366"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>Height="768"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>prism:ViewModelLocator.AutoWireViewModel="True"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>FontSize="22"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>WindowStartupLocation="CenterScreen">
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Grid extensions:FrameworkElementExtension.IsLoading="{Binding IsLoading}">
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources></Grid>
</Window>ViewModel代码：
namespace LoadingDemo.ViewModels
{
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>public class MainWindowViewModel : BindableBase
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>{
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>private bool _isLoading = false;
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>public bool IsLoading
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>{
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>get { return _isLoading; }
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>set { this.SetProperty(ref _isLoading, value); }
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>}
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>}
}运行效果：
三、高级用法
2.1 FrameworkElementExtension.IsLoading只能在Grid上使用吗？
答：No，几乎所有控件都可以使用，Window、Page、UserControl、Panel、Button、Rectangle、Path、TextBox等等，都没问题，只需要将IsLoading设置为True，就会出现Loading效果。
2.2 我觉得加载动画不好看，有没有办法换成其它的？
答：当然可以，除了默认加载效果以外，还可以添加任意你喜欢的效果，不管它是文字、动画、视频、gif图片还是其它的东西，通通都可以，并且操作非常简单，一共有两种方式。
[*]方式一：统一添加的方式
只需在Resources中添加一个名为MaskContent的资源，在触发加载遮罩显示的时候就会自动读取该资源作为动画元素，如果放在App.Resources中，整个项目所有加载效果都使用该资源，如果放在Window.Resources中，Window中的所有加载效果都使用该资源，以此类推。以下都是合法的代码。
添加自定义动画效果（用户控件）
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>
添加文字
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>
添加进度条控件
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>
[*]方式二：单独添加的方式
<Window
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>x:Class="LoadingDemo.Views.MainWindow"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns:extensions="clr-namespace:LoadingDemo.Extensions"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>xmlns:prism="http://prismlibrary.com/"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>Title="Loading测试"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>Width="1366"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>Height="768"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>prism:ViewModelLocator.AutoWireViewModel="True"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>FontSize="22"
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>WindowStartupLocation="CenterScreen">
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Grid extensions:FrameworkElementExtension.IsLoading="{Binding IsLoading}">
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources><Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources>
<Window.Resources>
<Window.Resources>
<Window.Resources>
<ProgressBar x:Key="MaskContent" Width="150" Height="15" HorizontalAlignment="Center" VerticalAlignment="Center" IsIndeterminate="True" />
</Window.Resources><TextBlock x:Key="MaskContent" Text="加载中..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontWeight="Bold" Foreground="White" />
</Window.Resources><controls:CustomLoading x:Key="MaskContent" Width="35" Height="35" />
</Window.Resources></Grid>
</Window>
四.综合案例
如需以上代码，请到群(661224882)共享文件中下载
来源:https://www.cnblogs.com/qushi2020/p/18101898
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