5.Prism对话框IDialogAware

案例：

项目添加Prism框架引用。

1.添加对话框项目，添加一个用户控件ConfigView.xaml

<UserControl x:Class="ConfigModule.Views.ConfigView"
             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:mah="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
             xmlns:local="clr-namespace:ConfigModule.Views"
             xmlns:prism="http://prismlibrary.com/"
             mc:Ignorable="d" 
             Width="430" Height="500">


    <Grid>
        
        <DockPanel HorizontalAlignment="Right" Grid.Row="1" Margin="0,5">
            <Button Content="{DynamicResource 确定}" Command="{Binding OKCommand}" Width="80" Height="30" Margin="5" FontSize="14"/>
            <Button Content="{DynamicResource 取消}" IsCancel="True" Width="80" Height="30" Margin="5" FontSize="14"/>
        </DockPanel>
    </Grid>

</UserControl>

2.添加一个Base基类,需要继承IDialogAware接口实现里面的方法(或vm中直接接触BindableBase, IDialogAware)。OnDialogOpened方法可以获取传过来的参数

 public class DialogViewModelBase : BindableBase, IDialogAware
    {
        public string Title { get; set; } = "对话框标题";

        public event Action<IDialogResult> RequestClose;

        /// <summary>
        /// 关闭对话框前，判断是否可以关闭
        /// </summary>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        public virtual bool CanCloseDialog()
        {
            return true;
        }

        /// <summary>
        /// 关闭时执行的方法
        /// </summary>
        public virtual void OnDialogClosed()
        {

        }

        /// <summary>
        /// 打开时执行的方法
        /// </summary>
        /// <param name="parameters"></param>
        /// <exception cref="NotImplementedException"></exception>
        public virtual void OnDialogOpened(IDialogParameters parameters)
        {

        }


        /// <summary>
        /// 关闭对话框
        /// </summary>
        /// <param name="buttonResult"></param>
        /// <param name="dialogParameters"></param>
        protected virtual void CloseDialog(ButtonResult buttonResult, IDialogParameters dialogParameters = null)
        {
            RequestClose?.Invoke(new DialogResult(buttonResult, dialogParameters));
        }

    }

3.添加ConfigViewModel类并继承DialogViewModelBase基类 。CloseDialog方法有两个参数，第一个是状态，第二个是参数，把参数传到父窗体中。

public  class ConfigViewModel: DialogViewModelBase
    {
        public DelegateCommand OKCommand { get; }
        public ConfigViewModel(SystemConfigManager systemConfigManager, SystemConfigProvider systemConfigProvider)
        {
            OKCommand = new DelegateCommand(Submit);
        }

        private void Submit()
        {
            CloseDialog(Prism.Services.Dialogs.ButtonResult.OK);
        }


    }

使用：v

 <MenuItem Header="系统设置" Command="{Binding SystemConfigCommand}"/>

vm

public class MenuViewModel: BindableBase
    {
        public DelegateCommand SystemConfigCommand { get;private set; }

        public MenuViewModel()
        {
            SystemConfigCommand = new DelegateCommand(SystemConfigAction);
        }

        private void SystemConfigAction()
        {
            DialogParameters parameters =new DialogParameters();
            parameters.Add("ConfigViewKey", $"ConfigViewKey页面，现在时间{DateTime.Now.ToString("yyyy-MM-dd")}");
            //弹窗并传入参数
            PrismProvider.DialogService.ShowDialog(ViewNames.ConfigView, parameters, Callback);
        }


        private void Callback(IDialogResult result)
        {
            //todo...获取参数
             var p= result.Parameters.GetValue<string>("key");
        }
    }