Ay写给2022的纯xaml [wpf4net5] - Caliburn Micro-Execute 异步里面更新界面UI[5/16]

时间：2021年09月24日 | 作者 : aaronyang | 分类 : WPF | 浏览: 831次 | 评论 0 人

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新建 ExecuteViewModel

using System.Threading.Tasks;
using Caliburn.Micro;
using cm1.Views;

namespace cm1.ViewModels
{
    public class ExecuteViewModel : Screen
    {
        public void StartSafeBackgroundWork()
        {
            Task.Factory.StartNew(SafeBackgroundWork);
        }
        public void StartUnSafeBackgroundWork()
        {
            Task.Factory.StartNew(UnsafeBackgroundWork);
        }

        private void SafeBackgroundWork()
        {
            Execute.OnUIThreadAsync(UpdateView);
        }

        private void UnsafeBackgroundWork()
        {
            UpdateView();
        }

        private Task UpdateView()
        {
            var view = (ExecuteView)GetView();

            view.UpdateView();

            return Task.CompletedTask;
        }
    }

}

添加ExecuteView.xaml和ExecuteView.xaml.cs 

添加2个按钮

<Page x:Class="cm1.Views.ExecuteView"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
      Title="ExecuteView">

    <Grid>
        <StackPanel Margin="40,20">
            <Button x:Name="StartUnSafeBackgroundWork" Content="非安全更新"/>
            <Button x:Name="StartSafeBackgroundWork" Content="使用CM的Execute.OnUIThread"/>
            <TextBlock x:Name="Output"/>
        </StackPanel>
    </Grid>
</Page>

后台使用 name点属性方式更新ui

    using System;
    
    namespace cm1.Views
    {
        public partial class ExecuteView
        {
            public ExecuteView()
            {
                InitializeComponent();
            }
    
            public void UpdateView()
            {
                Output.Text = "View Updated";
            }
        }
    }

打开Bootstrapper.cs 修改

       protected override void Configure()
        {
            container = new SimpleContainer();

            container.Instance(container);

            container
                .Singleton<IWindowManager, WindowManager>()
                .Singleton<IEventAggregator, EventAggregator>();

           
            container
               .PerRequest<ShellViewModel>()
               .PerRequest<MenuViewModel>()
               .PerRequest<BindingsViewModel>()
               .PerRequest<ActionsViewModel>()
               .PerRequest<CoroutineViewModel>()
               .PerRequest<ExecuteViewModel>();

        }

打开MenuViewModel.cs添加菜单

   Features = new BindableCollection<FeatureViewModel>
            {
                new FeatureViewModel("Binding Conventions", "Binding view model properties to your view.", typeof(BindingsViewModel)),
                new FeatureViewModel("Action Conventions", "Wiring view events to view model methods.", typeof(ActionsViewModel)),
                   new FeatureViewModel("Coroutines", "Using IEnumerable<IResult>", typeof(CoroutineViewModel)),
                                   new FeatureViewModel("Execute", "Using Execute to execute code on the UI thread.", typeof(ExecuteViewModel)),
            };

运行后效果：

点击非安全

点击使用CM的

我尝试了下下面的方式，不使用xaml.cs,移除Execute.xaml.cs

using System.Threading.Tasks;
using Caliburn.Micro;
using cm1.Views;

namespace cm1.ViewModels
{
    public class ExecuteViewModel : Screen
    {
        private string _Output;

        /// <summary>
        /// 输出
        /// </summary>
        public string Output
        {
            get { return _Output; }
            set { Set(ref _Output, value); }
        }

        public void StartSafeBackgroundWork()
        {
            Task.Factory.StartNew(SafeBackgroundWork);
        }
        public void StartUnSafeBackgroundWork()
        {
            Task.Factory.StartNew(UnsafeBackgroundWork);
        }

        private void SafeBackgroundWork()
        {
            Execute.OnUIThreadAsync(UpdateView);
        }

        private void UnsafeBackgroundWork()
        {
            UpdateView();
        }
        private Task UpdateView()
        {
            Output = "界面更新";

            return Task.CompletedTask;
        }
        //private Task UpdateView()
        //{
        //    var view = (ExecuteView)GetView();

        //    view.UpdateView();

        //    return Task.CompletedTask;
        //}
    }

}

发现 安全和不安全都可以

本文由 安徽 合肥 杨洋 1991年的 英文名AY   ===来自网站 www.ayjs.net 编写

本文由 安徽 合肥 杨洋 1991年的 英文名AY   ===来自网站 www.ayjs.net 编写

本文代码下载:第5天CM.zip

其他Ay准备升级到net5的纯xaml库

【ay wpf markup】AY XAML应该这样玩【1/18】-WPF-aaronyang技术分享 (ayjs.net)

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【ay wpf markup】AY XAML应该这样玩-for循环【4/18】-WPF-aaronyang技术分享 (ayjs.net)

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【ay wpf markup】AY XAML应该这样玩-ResourceCollection和ScriptHandler【6/18】-WPF-aaronyang技术分享 (ayjs.net)

【ay wpf markup】AY XAML应该这样玩-ResourceObject【7/18】-WPF-aaronyang技术分享 (ayjs.net)

【ay wpf markup】AY XAML应该这样玩-ScriptHandler组合，也是最常用的【8/18】-WPF-aaronyang技术分享 (ayjs.net)

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【ay wpf markup】AY XAML应该这样玩-Tower of Hanoi【10/18】-WPF-aaronyang技术分享 (ayjs.net)

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【ay wpf markup】AY XAML应该这样玩-获得焦点全选【14/18】-WPF-aaronyang技术分享 (ayjs.net)

【ay wpf markup】AY XAML应该这样玩-把Additional.Operations当资源【15/18】-WPF-aaronyang技术分享 (ayjs.net)

【ay wpf markup】AY XAML应该这样玩-给ListView创建数据【16/18】-WPF-aaronyang技术分享 (ayjs.net)

【ay wpf markup】AY XAML应该这样玩-和后台ViewModel交互，操作方法【17/18】-WPF-aaronyang技术分享 (ayjs.net)

默认代码模板

Window

<Window x:Class="Features.CrossPlatform.Views.ShellView"
        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"
        xmlns:cal="clr-namespace:Caliburn.Micro;assembly=Caliburn.Micro.Platform"
        mc:Ignorable="d"
        Title="ShellView" Height="450" Width="800">
    <Grid>
     
    </Grid>
</Window>

Page

<Page x:Class="Features.CrossPlatform.Views.MenuView"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
      Title="">

    <Grid>

    </Grid>
</Page>

UserControl

<UserControl  x:Class="cm1.Views.FeatureView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:cal="clr-namespace:Caliburn.Micro;assembly=Caliburn.Micro.Platform"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>

    </Grid>
</UserControl>

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