手写一个WPF-MVVM

 1 <Window x:Class="WPF_MVVM.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 5         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 6         xmlns:local="clr-namespace:WPF_MVVM"
 7         mc:Ignorable="d"
 8         Title="MainWindow" Height="350" Width="525" FontSize="24">
 9     <Grid>
10         <Grid.RowDefinitions>
11             <RowDefinition Height="Auto"/>
12             <RowDefinition Height="*"/>
13         </Grid.RowDefinitions>
14         <Menu>
15             <MenuItem Header="文件">
16                 <MenuItem Header="保存" Command="{Binding SaveCommand}"/>
17             </MenuItem>
18         </Menu>
19         <!--<Button Content="保存"/>-->
20         <Grid Grid.Row="1">
21             <Grid.RowDefinitions>
22                 <RowDefinition Height="Auto"/>
23                 <RowDefinition Height="Auto"/>
24                 <RowDefinition Height="Auto"/>
25                 <RowDefinition Height="*"/>
26             </Grid.RowDefinitions>
27             <TextBox x:Name="tx1" Grid.Row="0" Background="LightBlue" Margin="4" Text="{Binding Path=Input1}"/>
28             <TextBox x:Name="tx2" Grid.Row="1" Background="LightBlue" Margin="4" Text="{Binding Path=Input2}"/>
29             <TextBox x:Name="tx3" Grid.Row="2" Background="LightBlue" Margin="4" Text="{Binding Path=Result}"/>
30             <Button x:Name="addButton" Grid.Row="3" Content="加" Command="{Binding AddCommand}"/>
31         </Grid>
32     </Grid>
33 </Window>

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Linq;
 5 using System.Text;
 6 using System.Threading.Tasks;
 7 
 8 namespace WPF_MVVM.ViewModels
 9 {
10     class NotificationObject : INotifyPropertyChanged
11     {
12         public event PropertyChangedEventHandler PropertyChanged;
13 
14         public void RaisePropertyChanged(string propertyName)
15         {
16             if (this.PropertyChanged!=null)
17             {
18                 this.PropertyChanged.Invoke(this,new PropertyChangedEventArgs(propertyName));
19             }
20         }
21     }
22 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using System.Windows.Input;
 7 
 8 namespace WPF_MVVM.Commands
 9 {
10     class DelegateCommand : ICommand
11     {
12         /// <summary>
13         /// 这里定义事件可通知绑定命令的元素IsEnabled是True还是False
14         /// </summary>
15         public event EventHandler CanExecuteChanged
16         {
17             add { CommandManager.RequerySuggested += value; }
18             remove { CommandManager.RequerySuggested -= value; }
19         }
20 
21         public bool CanExecute(object parameter)
22         {
23             if (this.CanExecuteFunc==null)
24             {
25                 return true;
26             }
27 
28             return this.CanExecuteFunc(parameter);
29         }
30         public void Execute(object parameter)
31         {
32             if (this.ExecuteAction == null)
33             {
34                 return;
35             }
36 
37             this.ExecuteAction(parameter);
38         }
39         public Action<object> ExecuteAction { get; set; }
40         public Func<object,bool> CanExecuteFunc { get; set; }
41     }
42 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using Microsoft.Win32;
 7 using WPF_MVVM.Commands;
 8 
 9 namespace WPF_MVVM.ViewModels
10 {
11     class MainWindowViewModel:NotificationObject
12     {
13         private double input1;
14         public double Input1
15         {
16             get { return input1;}
17             set
18             {
19                 input1 = value;
20                 this.RaisePropertyChanged("Input1");
21             }
22         }
23 
24         private double input2;
25         public double Input2
26         {
27             get { return input2; }
28             set
29             {
30                 input2 = value;
31                 this.RaisePropertyChanged("Input2");
32             }
33         }
34 
35         private double result;
36         public double Result
37         {
38             get { return result; }
39             set
40             {
41                 result = value;
42                 this.RaisePropertyChanged("Result");
43             }
44         }
45         public DelegateCommand AddCommand { get; set; }
46         public DelegateCommand SaveCommand { get; set; }
47         private void Add(object parameter)
48         {
49             this.Result = this.Input1 + this.Input2;
50         }
51 
52         private bool CanAdd(object parmeter)
53         {
54             if (this.Input1!=0 && this.Input2!=0)
55             {
56                 return true;
57             }
58             else
59             {
60                 return false;
61             }
62         }
63 
64         private void Save(object parameter)
65         {
66             SaveFileDialog saveFileDialog=new SaveFileDialog();
67             saveFileDialog.ShowDialog();
68         }
69         public MainWindowViewModel()
70         {
71             this.AddCommand=new DelegateCommand();
72             this.AddCommand.ExecuteAction=new Action<object>(this.Add);
73             this.AddCommand.CanExecuteFunc=new Func<object, bool>(this.CanAdd);
74 
75             this.SaveCommand=new DelegateCommand();
76             this.SaveCommand.ExecuteAction=new Action<object>(this.Save);
77         }
78     }
79 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using System.Windows;
 7 using System.Windows.Controls;
 8 using System.Windows.Data;
 9 using System.Windows.Documents;
10 using System.Windows.Input;
11 using System.Windows.Media;
12 using System.Windows.Media.Imaging;
13 using System.Windows.Navigation;
14 using System.Windows.Shapes;
15 using WPF_MVVM.ViewModels;
16 
17 namespace WPF_MVVM
18 {
19     /// <summary>
20     /// MainWindow.xaml 的交互逻辑
21     /// </summary>
22     public partial class MainWindow : Window
23     {
24         public MainWindow()
25         {
26             InitializeComponent();
27             this.DataContext = new MainWindowViewModel();
28         }
29     }
30 }