WPF 之数据与命令绑定（MVVM方式）

痛定思痛。 2023-01-05 12:56 218阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDYzOTA5NQ_size_16_color_FFFFFF_t_70]

#### 目录格式 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDYzOTA5NQ_size_16_color_FFFFFF_t_70 1]

#### 实现的功能 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDYzOTA5NQ_size_16_color_FFFFFF_t_70 2]

#### XAML 文件 ####

#### baseCommon NotifyPropertyChanged.cs ####

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.ComponentModel;
    
    namespace dataEventBinding.baseCommon
    { 
        public class NotifyPropertyChanged : INotifyPropertyChanged
        { 
            public event PropertyChangedEventHandler PropertyChanged = (sender, e) => {  };
    
            // 通知属性更改 <param name="propertyName" />
            protected void RaisePropertyChanged(string propertyName)
            { 
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

#### baseCommon RelayCommand.cs ####

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Input;
    
    namespace dataEventBinding.baseCommon
    { 
        class RelayCommand : ICommand
        { 
            public event EventHandler CanExecuteChanged = (sender, e) => {  };
    
            private Action mAction;
    
            public RelayCommand(Action action) { 
                this.mAction = action;
            }
    
            public bool CanExecute(object parameter)
            { 
                return true;
            }
    
            public void Execute(object parameter)
            { 
                mAction.Invoke();
            }
        }
    }

#### ViewModels MainViewModel.cs ####

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows;
    using System.Windows.Input;
    
    namespace dataEventBinding.ViewModels
    { 
        public class MainViewModel : baseCommon.NotifyPropertyChanged
        { 
            public MainViewModel()
            { 
                SignInCommand = new baseCommon.RelayCommand(() => { 
                    MessageBox.Show(searchText);
                });
            }
    
            private string searchText;
    
            // 发布方法 供外面使用
            public ICommand SignInCommand {  get; private set; }
    
            public string SearchText
            { 
                get {  return searchText; }
                set {  searchText = value; RaisePropertyChanged(nameof(searchText)); }
            }
    
        }
    }

#### MainWindow.xaml.cs ####

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Data;
    using System.Windows.Documents;
    using System.Windows.Input;
    using System.Windows.Media;
    using System.Windows.Media.Imaging;
    using System.Windows.Navigation;
    using System.Windows.Shapes;
    
    namespace dataEventBinding.Views
    { 
        /// <summary>
        /// MainWindow.xaml 的交互逻辑
        /// </summary>
        public partial class MainWindow : Window
        { 
            // 创建对象并赋值给 window.DataContext
            public ViewModels.MainViewModel m = new ViewModels.MainViewModel(); 
            public MainWindow()
            {            
                InitializeComponent();
                m.SearchText = "water";
                this.DataContext = m;
            }
        }
    }

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDYzOTA5NQ_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20210112191046735.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDYzOTA5NQ==,size_16,color_FFFFFF,t_70
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