异步编程基础练习

通过本实验，熟悉和掌握Lambda表达式、Action委托和Func委托的使用。

1、创建一个WPF应用程序项目

2、将App.xaml中的Application.Resources节内容改为

3、修改MainWindow.xaml及代码隐藏类

MainWindow.xaml

MainWindow.cs主要内容

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 WpfApp1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        Button oldButton = new Button();
        public MainWindow()
        {
            InitializeComponent();
        }
        private void button_Click(object sender, RoutedEventArgs e)
        {
            Button btn = e.Source as Button;
            btn.Foreground = Brushes.Black;
            oldButton.Foreground = Brushes.Black;
            oldButton = btn;
            frame1.Source = new Uri(btn.Tag.ToString(), UriKind.Relative);
        }
    }
}

Page1

Page1.xaml

Page1.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
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 WpfApp1.Examples
{
    /// <summary>
    /// Page1.xaml 的交互逻辑
    /// </summary>
    public partial class Page1 : Page
    {

        public Page1()
        {
            InitializeComponent();
        }
        StringBuilder sb;

        

       

        private void Btn_Click(object sender, RoutedEventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            List<int> n1 = new List<int> { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
            sb.AppendFormat("List<int>中的数：{0}", string.Join(",", n1.ToArray()));
            var q1 = n1.Where(i => i < 4);
            sb.AppendFormat("\n小于4的数：{0}", string.Join(",", q1.ToArray()));
            sb.AppendLine("\n");
            int[] n2 = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
            sb.AppendFormat("数字序列：{0}", string.Join(",", n2));
            string[] strings = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
            var q2 = n2.Select((n)=>strings[n]);
            sb.AppendFormat("\n数字对应的单词：{0}", string.Join(",", q2.ToArray()));
            var q3 = n2.Where((n) => n % 2 == 0);
            sb.AppendFormat("\n偶数：{0}", string.Join(",", q3.ToArray()));
            sb.AppendLine();
            textBlock1.Text = sb.ToString();
        }
    }
}

Page2

Page2.xaml

Page2.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
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 WpfApp1.Examples
{
    /// <summary>
    /// Page2.xaml 的交互逻辑
    /// </summary>
    public partial class Page2 : Page
    {
       
        public Page2()
        {
            InitializeComponent();
           

        }

       
        private void Btn_Click(object sender, RoutedEventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            Action a1 = () => sb.AppendFormat("Action示例1（无输入参数）");
            a1();
            Action<int, int> a2 = (a, b) =>
             {
                 sb.AppendFormat("Action示例2（有2个输入参数）,");
                 if (a > b)
                 {
                     sb.AppendLine("结果：a>b");

                 }
                 else if (a == b) sb.AppendLine("结果：a==b");
                 else sb.AppendLine("结果：a<b");
             };
            a2(3, 5);
            Func<bool> f1 = () => 3 <= 5;
            sb.AppendFormat("Func示例1（无输入参数，返回类型bool）,结果：{0}\n", f1());

            Func<int, bool> f2 = n => { return n < 5; };
            sb.AppendFormat("Func示例2（有1个输入参数，返回类型为bool）,结果：{0}\n",f2(3));
            Func<string, bool, string> f3 = (s, b) =>
            {
                if (b == false) return s.ToLower();
                else return s.ToUpper();
            };
            sb.AppendFormat("示例3（有2个输入参数，返回类型为string）,结果为：{0}，{1}\n", f3("This is a Book",true),f3("This is a Book",false));
            string[] words = { "orange", "apple", "Article" };
            var q = words.Select(a => a.ToUpper());
            sb.AppendFormat("Func示例4（有1个输入参数，返回类型为string）,结果为：{0}", string.Join(",", q.ToArray()));

            textBlock1.Text = sb.ToString();


        }
    }
}

运行结果

通过本实验，熟悉和掌握了Lambda表达式、Action委托和Func委托的使用