wpf prism 弹出框（参数支持父传子，子传父）及消息发布、订阅

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1、新建项目wpfApp6，添加Nuget引用，并初始化App.xaml 及 cs 类

 app.cs 如下

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    public partial class App : PrismApplication
    {
        protected override Window CreateShell()
        {
            return Container.Resolve<MainView>();
        }

        protected override void RegisterTypes(IContainerRegistry containerRegistry)
        {
            containerRegistry.RegisterDialog<UserControlA, UserControlAModel>("UserControlA");
        }
  
    }
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app.xaml 如下：

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<Prism:PrismApplication x:Class="WpfApp6.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp6"
             xmlns:Prism="http://prismlibrary.com/" >
    <Application.Resources>
         
    </Application.Resources>
</Prism:PrismApplication>
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说明如下：

app.cs 中设定了启动窗体

return Container.Resolve<MainView>();

app.cs 中注入了一个对话框，名称为：UserControlA ，并设定了viewModel数据上下文： UserControlAModel

 containerRegistry.RegisterDialog<UserControlA, UserControlAModel>("UserControlA");

2、启动窗体

启动窗体必须写在Views文件夹中，且必须以View结尾，启动窗体的viewModel必须放在ViewModels文件夹中，且必须以Model结尾

xaml

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<Window x:Class="WpfApp6.Views.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:WpfApp6.Views"
        xmlns:Prism="http://prismlibrary.com/"
        Prism:ViewModelLocator.AutoWireViewModel="true"
        mc:Ignorable="d"
        Title="MainView" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/> 
        </Grid.RowDefinitions>

        <StackPanel Orientation="Horizontal">
            <Button Content="点击并弹出用户控件" Margin="5" Height="35" Width="150" Command="{Binding BtnCommand}" CommandParameter="UserControlA"></Button> 
         
        </StackPanel>

         
    </Grid>
</Window>
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viewModel如下：

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    public class MainViewModel : BindableBase
    {
        /// <summary>
        /// 窗体Button按钮事件，用于点击后，弹出框
        /// </summary>
        public DelegateCommand<string> BtnCommand { get; set; }
        /// <summary>
        /// 引入Prism 的 DialogService 服务，它可以弹出用户控件，或者窗体
        /// </summary>
        private readonly IDialogService dialogService;
        public MainViewModel(IDialogService dialogService)
        {
            BtnCommand = new DelegateCommand<string>(open);
            this.dialogService = dialogService;
        }

        private void open(string obj)
        {
            //弹框传递的参数，键值对
            IDialogParameters parameters = new DialogParameters();
            parameters.Add("schoolId", 1);
            parameters.Add("schoolName", "河南大学");
            //弹出框 并传递参数、设定弹出窗体关闭时的回调函数
            dialogService.ShowDialog(obj, parameters,callback);
        }

        /// <summary>
        /// 弹出窗体关闭时的回调函数
        /// </summary>
        /// <param name="result"></param>
        private void callback(IDialogResult result)
        {
            if (result.Result == ButtonResult.OK)
            {
                var closeParam = result.Parameters.GetValue<string>("closeParam");
            }
        }
    }
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3、弹出的用户控件

xaml

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<UserControl x:Class="WpfApp6.UserControls.UserControlA"
             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:local="clr-namespace:WpfApp6.UserControls"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition />
            <RowDefinition  Height="auto"/>
        </Grid.RowDefinitions>
        <TextBlock Text="温馨提示" FontSize="30" Grid.Row="0"/>
        <TextBlock Text="我是用户控件A" FontSize="30" Grid.Row="1" TextAlignment="Center"/>
        <StackPanel Grid.Row="2" Orientation="Horizontal" HorizontalAlignment="Right" Margin="5">
            <Button Height="30" Width="100" Content="确定" Margin="5" Command="{Binding saveCommand}"/>
            <Button Height="30" Width="100" Content="取消" Margin="5" Command="{Binding cancelCommand}"/>
        </StackPanel>

    </Grid>
</UserControl>
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viewModel如下

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using Prism.Commands;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfApp6.UserControlModels
{
    /// <summary>
    /// 被弹出的框，用户控件
    /// </summary>
    public class UserControlAModel : IDialogAware
    {
        public string Title { get; set; }

        /// <summary>
        /// 关闭窗体请求事件
        /// </summary>
        public event Action<IDialogResult> RequestClose;

        /// <summary>
        /// 保存按钮事件
        /// </summary>
        public DelegateCommand saveCommand { get; set; }
        /// <summary>
        /// 取消按钮事件
        /// </summary>
        public DelegateCommand cancelCommand { get; set; }
        public UserControlAModel()
        {
            this.Title = "用户控件A";
            saveCommand = new DelegateCommand(save);
            cancelCommand = new DelegateCommand(cancel);
        }

        /// <summary>
        /// 保存，关闭窗体，并传值给主窗体
        /// </summary>
        private void save()
        {
            OnDialogClosed();
        }

        /// <summary>
        /// 取消，直接关闭窗体
        /// </summary>
        private void cancel()
        { 
            RequestClose.Invoke(new DialogResult(ButtonResult.No));
        }

        /// <summary>
        /// 是否可关闭窗体，可以写一些业务逻辑，这里直接返回True
        /// </summary>
        /// <returns></returns>
        public bool CanCloseDialog()
        {
            return true;
        }

        /// <summary>
        /// 关闭窗体，并传值给主窗体
        /// </summary>
        public void OnDialogClosed()
        {
            IDialogParameters parameters = new DialogParameters();
            parameters.Add("closeParam", "我是closeParam值");
            RequestClose?.Invoke(new DialogResult(ButtonResult.OK, parameters));
        }

        /// <summary>
        /// 窗体打开后，接收主窗体传递的参数，并赋值给窗体的Title属性
        /// </summary>
        /// <param name="parameters"></param>
        public void OnDialogOpened(IDialogParameters parameters)
        {
            var schoolName = parameters.GetValue<string>("schoolName");
            var Id = parameters.GetValue<int>("Id");
            this.Title = schoolName + "_" + Id;
        }
    }
}
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 4、消息发布与订阅

 新建Event文件夹并创建如下类

    public class MessageEvent : PubSubEvent<string>
    {
    }

发布消息

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   /// <summary>
        /// 窗体Button按钮事件，用于点击后，弹出框
        /// </summary>
        public DelegateCommand<string> BtnCommand { get; set; }
        /// <summary>
        /// 引入Prism 的 DialogService 服务，它可以弹出用户控件，或者窗体
        /// </summary>
        private readonly IDialogService dialogService;
        /// <summary>
        /// 
        /// </summary>
        private readonly IEventAggregator aggregator;
        public MainViewModel(IDialogService dialogService, IEventAggregator _aggregator)
        {
            BtnCommand = new DelegateCommand<string>(open);
            this.dialogService = dialogService;
            this.aggregator = _aggregator;
        }

        private void open(string obj)
        {
            //弹框传递的参数，键值对
            IDialogParameters parameters = new DialogParameters();
            parameters.Add("schoolId", 1);
            parameters.Add("schoolName", "河南大学");
            //发布一个消息
            aggregator.GetEvent<MessageEvent>().Publish("hello 陈大六");
            //弹出框 并传递参数、设定弹出窗体关闭时的回调函数
            dialogService.ShowDialog(obj, parameters,callback);
        }
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 订阅消息

        public UserControlA(IEventAggregator aggregator)
        {
            var evn = aggregator.GetEvent<MessageEvent>().Subscribe(callback =>
            {
                MessageBox.Show(callback);
            });
            InitializeComponent(); 
        }

 

@天才卧龙的博尔乐

posted @   天才卧龙  阅读(677)  评论(0)  编辑  收藏  举报
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