C#學習5

建一個WPF檔案，選擇兩個日期，使用if,else語句並判斷兩個日期的大小

using System;using System.Collections.Generic;using System.Linq;using System.Text;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 com{    /// <summary>    /// MainWindow.xaml 的互動邏輯    /// </summary>    public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();            First.Text = DateTime.Today.ToString();            Second.Text = DateTime.Today.ToString();        }        private void Quit_Click(object sender, RoutedEventArgs e)        {            this.Close();        }        private void show(string exp, bool result)        {            info.Text += exp;            info.Text += " : " + result.ToString();            info.Text += "\r\n";        }        private int dateCompare(DateTime left, DateTime right)        {            int result;            if (left.Year > right.Year)                result = 1;            else if (left.Year < right.Year)                result = -1;            else if (left.Month > right.Month)                result = 1;            else if (left.Month < right.Month)                result = -1;            else if (left.Day > right.Day)                result = 1;            else if (left.Day < right.Day)                result = -1;            else                result = 0;            return result;        }        private void Compare_Click(object sender, RoutedEventArgs e)        {            int ans = dateCompare(First.SelectedDate.Value, Second.SelectedDate.Value);            info.Text = "";            show("First==Second", ans == 0);            show("First>Second", ans == 1);            show("First<Second", ans == -1);        }    }}

建一個WPF檔案，使用swith語句進行字串的轉換

using System;using System.Collections.Generic;using System.Linq;using System.Text;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 camm{    /// <summary>    /// MainWindow.xaml 的互動邏輯    /// </summary>    public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();        }        private void Copy_Click(object sender, RoutedEventArgs e)        {            target.Text = "";            string from = source.Text;            for (int i = 0; i < from.Length; i++)            {                char current = from[i];                CopyOne(current);            }        }        private void CopyOne(char current)        {            switch (current)            {                case '<':                    target.Text += "<:";                    break;                case '>':                    target.Text += ">:";                    break;                case '&':                    target.Text += "&:";                    break;                case '\"':                    target.Text += "":";                    break;                case '\'':                    target.Text += "':";                    break;                default:                    target.Text += current;                    break;            }        }        private void Quit_Click(object sender, RoutedEventArgs e)        {            this.Close();        }    }}