1、View负责前端展示,与ViewModel进行数据和命令的交互。(双向的数据属性传递,单向的命令属性传递View→ViewModel)
2、ViewModel,负责前端视图业务级别的逻辑结构组织,并将其反馈给前端。
3、Model,主要负责数据实体的结构处理,与ViewModel进行交互。
其实我个人认为,数据和业务交互这一层还是应该另外独立,Model中完全就是实体模型,这样更清晰。
【安装Prism模板框架】建议用手机热点下载。也可以在VS的NuGet中搜索,但是每建一个项目就需要搜索引用一次,麻烦。
新建Prsm Blank App(WPF) 项目:Demo MVVM
Views中MainWindow.xaml代码:
<Window x:Class="DemoMVVM.Views.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:prism="http://prismlibrary.com/" prism:ViewModelLocator.AutoWireViewModel="True" Title="{Binding Title}" Height="200" Width="300"> <StackPanel> <TextBox Text="{Binding Input1}" Margin="5,20,5,5" Width="100"/> <TextBox Text="{Binding Input2}" Margin="5" Width="100"/> <Button Command="{Binding AddCommand}" Content="求和" Width="75" Margin="5"/> <TextBox Text="{Binding Result}" Margin="5" Width="100"/> </StackPanel> </Window>
ViewModels中MainWindowViewModel.cs代码:其他文件代码不动
using Prism.Mvvm; using Prism.Commands; //引入命令 using System; //ViewModel为View提供数据属性、命令属性 namespace DemoMVVM.ViewModels { public class MainWindowViewModel : BindableBase { #region 私有变量,以及对应的属性(习惯大写) private string _title = "Prism Application"; private double _input1; //默认0 private double _input2; private double _result; public double Result //数据属性 { get { return _result; } set { _result = value; RaisePropertyChanged("Result"); } //变化结果展示在View界面上 } public double Input2 //数据属性 { get { return _input2; } set { _input2 = value; } } public double Input1 //数据属性 { get { return _input1; } set { _input1 = value; } } public string Title //数据属性 { get { return _title; } set { _title = value; } } #endregion #region 命令属性 public DelegateCommand AddCommand { get; set; } #endregion public void Add() //方法 { this.Result = this.Input1 + this.Input2; } public MainWindowViewModel() //将方法Add与命令属性AddCommand联系起来 { this.AddCommand = new DelegateCommand(new Action(Add)); } } }
注意:View与ModelView传递的是属性、属性、属性(习惯大写)
新建Prsm Blank App(WPF) 项目:BlankApp5
Views中MainWindow.xaml代码:
<Window x:Class="BlankApp5.Views.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:prism="http://prismlibrary.com/" prism:ViewModelLocator.AutoWireViewModel="True" Title="{Binding Title}" Height="200" Width="300"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="*"/> <RowDefinition Height="*"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <StackPanel Grid.Row="0" Orientation="Horizontal" VerticalAlignment="Center"> <TextBlock Text="学号" Margin="20,0" VerticalAlignment="Center"/> <TextBox Text="{Binding Id}" IsReadOnly="True" Width="200" Padding="2" /> </StackPanel> <StackPanel Grid.Row="1" Orientation="Horizontal" VerticalAlignment="Center"> <TextBlock Text="姓名" Margin="20,0" VerticalAlignment="Center"/> <TextBox Text="{Binding Name}" IsReadOnly="True" Width="200" Padding="2"/> </StackPanel> <Button Command="{Binding ShowCommand}" Content="显示" Grid.Row="2" VerticalAlignment="Center" Width="50"/> </Grid> </Window>
ViewModels中MainWindowViewModel.cs代码:其他文件代码不动
using Prism.Mvvm; using Prism.Commands; using System; namespace BlankApp5.ViewModels { public class MainWindowViewModel : BindableBase { #region 私有变量,以及对应的属性(习惯大写) private string _title = "Prism Application"; private string _name; private string _id; public string Id { get { return _id; } set { _id = value; RaisePropertyChanged("Id"); } } public string Name { get { return _name; } set { _name = value; RaisePropertyChanged("Name"); } } public string Title { get { return _title; } set { _title=value; } } #endregion #region 命令属性 public DelegateCommand ShowCommand { get; set; } #endregion public void Show() //方法 { this.Name = "夕西行"; this.Id = "20190809"; } public MainWindowViewModel() //命令属性与方法联系起来 { this.ShowCommand = new DelegateCommand(new Action(Show)); } } }
MainWindow.xaml.cs代码:贴出来只是有疑问,大神可解答下
using System.Windows; using BlankApp5.ViewModels; namespace BlankApp5.Views { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); //this.DataContext = new MainWindowViewModel(); //这句有无貌似没什么影响,懂得大神可以留言讲下 } } }