以下是一些經典的WPF入門實例，它們可以幫助你熟悉并理解WPF的基本概念和用法：
1. Hello, WPF!: 這個例子非常簡單，它展示了一個包含一個按鈕的窗口，并演示了如何處理按鈕的點擊事件。
```xaml<Window x:Class="MyWpfApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Hello, WPF!" Height="200" Width="300"> <Grid> <Button Content="Click Me" Click="Button_Click" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid></Window>```
```csharpusing System.Windows;
namespace MyWpfApp{ public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); }
private void Button_Click(object sender, RoutedEventArgs e) { MessageBox.Show("Hello, WPF!"); } }}```
2. 數據綁定: 這個例子展示了如何使用數據綁定來將數據與界面元素進行關聯。它展示了一個簡單的學生信息列表，并演示了如何通過數據綁定顯示和編輯學生的姓名和年齡。
```xaml<Window x:Class="MyWpfApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Student List" Height="300" Width="400"> <StackPanel> <ListBox x:Name="lstStudents" DisplayMemberPath="Name" SelectionChanged="lstStudents_SelectionChanged" /> <TextBox x:Name="txtName" Text="{Binding SelectedItem.Name, ElementName=lstStudents}" /> <TextBox x:Name="txtAge" Text="{Binding SelectedItem.Age, ElementName=lstStudents}" /> </StackPanel></Window>```
```csharpusing System.Collections.ObjectModel;using System.ComponentModel;using System.Windows;
namespace MyWpfApp{ public partial class MainWindow : Window { public ObservableCollection<Student> Students { get; set; }
public MainWindow() { InitializeComponent(); DataContext = this;
Students = new ObservableCollection<Student> { new Student { Name = "Alice", Age = 20 }, new Student { Name = "Bob", Age = 22 }, new Student { Name = "Charlie", Age = 19 } };
lstStudents.ItemsSource = Students; }
private void lstStudents_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e) { CollectionViewSource.GetDefaultView(Students).Refresh(); } }
public class Student : INotifyPropertyChanged { private string name; public string Name { get { return name; } set { if (name != value) { name = value; OnPropertyChanged(nameof(Name)); } } }
private int age; public int Age { get { return age; } set { if (age != value) { age = value; OnPropertyChanged(nameof(Age)); } } }
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } }}```
3. 命令: 這個例子展示了如何使用命令來處理用戶界面上的操作。它展示了一個包含兩個按鈕的窗口，點擊按鈕時分別觸發自定義命令的執行。
```xaml<Window x:Class="MyWpfApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Command Example" Height="200" Width="300"> <StackPanel> <Button Content="Say Hello" Command="{Binding SayHelloCommand}" /> <Button Content="Say Goodbye" Command="{Binding SayGoodbyeCommand}" /> </StackPanel></Window>```
```csharpusing System;using System.Windows;using System.Windows.Input;
namespace MyWpfApp{ public partial class MainWindow : Window { public ICommand SayHelloCommand { get; set; } public ICommand SayGoodbyeCommand { get; set; }
public MainWindow() { InitializeComponent(); DataContext = this;
SayHelloCommand = new RelayCommand(SayHello); SayGoodbyeCommand = new RelayCommand(SayGoodbye); }
private void SayHello(object parameter) { MessageBox.Show("Hello, WPF!"); }
private void SayGoodbye(object parameter) { MessageBox.Show("Goodbye, WPF!"); } }
public class RelayCommand : ICommand { private Action<object> execute; private Func<object, bool> canExecute;
public event EventHandler CanExecuteChanged { add { CommandManager.RequerySuggested += value; } remove { CommandManager.RequerySuggested -= value; } }
public RelayCommand(Action<object> execute) : this(execute, null) { }
public RelayCommand(Action<object> execute, Func<object, bool> canExecute) { this.execute = execute; this.canExecute = canExecute; }
public bool CanExecute(object parameter) { return canExecute == null || canExecute(parameter); }
public void Execute(object parameter) { execute(parameter); } }}```
這些例子涵蓋了WPF的基本概念和用法，其中包括界面組件的使用、數據綁定、命令等。通過學習和實踐這些例子，你可以快速入門并開始開發自己的WPF應用程序。
該文章在 2024/2/7 23:15:35 編輯過
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