B站朝夕教育 【.NET9.0+WPF实战三类流程化业务逻辑控制】学习记录 【三】

播放地址：20241120-.NET9.0+WPF实战三类流程化业务逻辑控制-10_哔哩哔哩_bilibili

第7-9课时，简单实现通过NodeModel类及子类实现绑定式的拖拽

新增NodeModel.cs文件实现拖拽信息传递数据记录

    public abstract class NodeModel
    {
        public abstract string Name { get; set; }
        public abstract void Execute();
    }

新增ProcessA.cs，ProcessA.cs，ProcessC.cs，ProcessD.cs文件

    public class ProcessA : NodeModel
    {
        public override string Name { get; set; }="AAAA";

        public override void Execute()
        {
            Debug.WriteLine("正在执行ProcessA");
        }
    }
    public class ProcessB : NodeModel
    {
        public override string Name { get; set; }="BBBB";

        public override void Execute()
        {
            Debug.WriteLine("正在执行ProcessB");
        }
    }
    public class ProcessC : NodeModel
    {
        public override string Name { get; set; }="CCC";

        public override void Execute()
        {
            Debug.WriteLine("正在执行ProcessC");
        }
    }
    public class ProcessD : NodeModel
    {
        public override string Name { get; set; }="DDDD";

        public override void Execute()
        {
            Debug.WriteLine("正在执行ProcessD");
        }
    }

为了实现双向绑定需要安装CommunityToolkit.Mvvm包 在Nuget上搜索communityToolkit,这里安装8.3.2

调整MainViewModel.cs文件中的内容最终代码如下

注意第五行引用，第九行设置类为partial 否则运行报错，26行特性属性主要用于前台点击按钮时调用触发

using System.Collections.ObjectModel;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows;
using CommunityToolkit.Mvvm.Input;

namespace WpfApp2
{
    public partial class MainViewModel
    {
        public ObservableCollection<NodeModel> ProcessList { get; set; } = new ObservableCollection<NodeModel>();

        public void ListViewItem_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            DragDrop.DoDragDrop((DependencyObject)sender, (sender as ListViewItem).Content, DragDropEffects.Copy);
        }

        public void ListBox_Drop(object sender, DragEventArgs e)
        {
            string value = e.Data.GetData(typeof(string)).ToString();
            ProcessList.Add(new ProcessA());
            ProcessList.Add(new ProcessB());
            ProcessList.Add(new ProcessC());
            ProcessList.Add(new ProcessD());
        }
        [RelayCommand]
        private void Execute()
        {
            foreach (var item in ProcessList)
            {
                item.Execute();
            }
        }
    }
}

MainView.xaml文件代码

<Window x:Class="WpfApp2.MainView"
        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:local="clr-namespace:WpfApp2" xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        Background="White"
        Title="MainView" Height="650" Width="1300">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200" />
            <ColumnDefinition Width="300" />
            <ColumnDefinition />           
        </Grid.ColumnDefinitions>
        <Button Content="执行" HorizontalAlignment="Stretch" Margin="3"  Command="{Binding ExecuteCommand}" />
        <ListView Grid.Row="1" Grid.Column="0">
            <ListViewItem Content="AAA">
                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="PreviewMouseLeftButtonDown">
                        <i:CallMethodAction MethodName="ListViewItem_MouseLeftButtonDown" TargetObject="{Binding}" />
                    </i:EventTrigger>
                </i:Interaction.Triggers>
            </ListViewItem>
            <ListViewItem Content="BBB"></ListViewItem>
            <ListViewItem Content="CCC"></ListViewItem>
            <ListViewItem Content="DDD"></ListViewItem>
        </ListView>
        <ListBox Grid.Row="1" Grid.Column="1" AllowDrop="True" ItemsSource="{Binding ProcessList}">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Drop">
                    <i:CallMethodAction MethodName="ListBox_Drop" TargetObject="{Binding}" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </ListBox>
    </Grid>
</Window>

本节主要演示增加了Button按钮，通过拖拽列表到右侧后，除了界面上增加了内容以后，点击执行按钮，可以通过调试输出窗口看到同时执行了内部的一些逻辑，后续代码复杂之后，可以通过这个逻辑执行解决复杂的问题
第9课主要讲解解释第7-8课代码实现的逻辑以及作用，承上启下告知后续会如何调整代码让使用逻辑更加灵活