wpf prism 彈出框（參數支持父傳子，子傳父）及消息發佈、訂閱

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學無止境，精益求精

1、新建項目wpfApp6，添加Nuget引用，並初始化App.xaml 及 cs 類

 app.cs 如下

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

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

app.xaml 如下：

<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>

說明如下：

app.cs 中設定了啓動窗體

return Container.Resolve<MainView>();

app.cs 中注入了一個對話框，名稱爲：UserControlA ，並設定了viewModel數據上下文： UserControlAModel

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

2、啓動窗體

啓動窗體必須寫在Views文件夾中，且必須以View結尾，啓動窗體的viewModel必須放在ViewModels文件夾中，且必須以Model結尾

xaml

<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="點擊並彈出用戶控件" Margin="5" Height="35" Width="150" Command="{Binding BtnCommand}" CommandParameter="UserControlA"></Button> 
         
        </StackPanel>

         
    </Grid>
</Window>

viewModel如下：

    public class MainViewModel : BindableBase
    {
        /// <summary>
        /// 窗體Button按鈕事件，用於點擊後，彈出框
        /// </summary>
        public DelegateCommand<string> BtnCommand { get; set; }
        /// <summary>
        /// 引入Prism 的 DialogService 服務，它可以彈出用戶控件，或者窗體
        /// </summary>
        private readonly IDialogService dialogService;
        public MainViewModel(IDialogService dialogService)
        {
            BtnCommand = new DelegateCommand<string>(open);
            this.dialogService = dialogService;
        }

        private void open(string obj)
        {
            //彈框傳遞的參數，鍵值對
            IDialogParameters parameters = new DialogParameters();
            parameters.Add("schoolId", 1);
            parameters.Add("schoolName", "河南大學");
            //彈出框 並傳遞參數、設定彈出窗體關閉時的回調函數
            dialogService.ShowDialog(obj, parameters,callback);
        }

        /// <summary>
        /// 彈出窗體關閉時的回調函數
        /// </summary>
        /// <param name="result"></param>
        private void callback(IDialogResult result)
        {
            if (result.Result == ButtonResult.OK)
            {
                var closeParam = result.Parameters.GetValue<string>("closeParam");
            }
        }
    }

3、彈出的用戶控件

xaml

<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="溫馨提示" FontSize="30" Grid.Row="0"/>
        <TextBlock Text="我是用戶控件A" FontSize="30" Grid.Row="1" TextAlignment="Center"/>
        <StackPanel Grid.Row="2" Orientation="Horizontal" HorizontalAlignment="Right" Margin="5">
            <Button Height="30" Width="100" Content="確定" Margin="5" Command="{Binding saveCommand}"/>
            <Button Height="30" Width="100" Content="取消" Margin="5" Command="{Binding cancelCommand}"/>
        </StackPanel>

    </Grid>
</UserControl>

viewModel如下

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>
    /// 被彈出的框，用戶控件
    /// </summary>
    public class UserControlAModel : IDialogAware
    {
        public string Title { get; set; }

        /// <summary>
        /// 關閉窗體請求事件
        /// </summary>
        public event Action<IDialogResult> RequestClose;

        /// <summary>
        /// 保存按鈕事件
        /// </summary>
        public DelegateCommand saveCommand { get; set; }
        /// <summary>
        /// 取消按鈕事件
        /// </summary>
        public DelegateCommand cancelCommand { get; set; }
        public UserControlAModel()
        {
            this.Title = "用戶控件A";
            saveCommand = new DelegateCommand(save);
            cancelCommand = new DelegateCommand(cancel);
        }

        /// <summary>
        /// 保存，關閉窗體，並傳值給主窗體
        /// </summary>
        private void save()
        {
            OnDialogClosed();
        }

        /// <summary>
        /// 取消，直接關閉窗體
        /// </summary>
        private void cancel()
        { 
            RequestClose.Invoke(new DialogResult(ButtonResult.No));
        }

        /// <summary>
        /// 是否可關閉窗體，可以寫一些業務邏輯，這裏直接返回True
        /// </summary>
        /// <returns></returns>
        public bool CanCloseDialog()
        {
            return true;
        }

        /// <summary>
        /// 關閉窗體，並傳值給主窗體
        /// </summary>
        public void OnDialogClosed()
        {
            IDialogParameters parameters = new DialogParameters();
            parameters.Add("closeParam", "我是closeParam值");
            RequestClose?.Invoke(new DialogResult(ButtonResult.OK, parameters));
        }

        /// <summary>
        /// 窗體打開後，接收主窗體傳遞的參數，並賦值給窗體的Title屬性
        /// </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;
        }
    }
}

 

 4、消息發佈與訂閱

 新建Event文件夾並創建如下類

    public class MessageEvent : PubSubEvent<string>
    {
    }

發佈消息

   /// <summary>
        /// 窗體Button按鈕事件，用於點擊後，彈出框
        /// </summary>
        public DelegateCommand<string> BtnCommand { get; set; }
        /// <summary>
        /// 引入Prism 的 DialogService 服務，它可以彈出用戶控件，或者窗體
        /// </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)
        {
            //彈框傳遞的參數，鍵值對
            IDialogParameters parameters = new DialogParameters();
            parameters.Add("schoolId", 1);
            parameters.Add("schoolName", "河南大學");
            //發佈一個消息
            aggregator.GetEvent<MessageEvent>().Publish("hello 陳大六");
            //彈出框 並傳遞參數、設定彈出窗體關閉時的回調函數
            dialogService.ShowDialog(obj, parameters,callback);
        }

 訂閱消息

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

 

@天才臥龍的博爾樂