WPF通过出生日期计算年龄

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在WPF 中用DatePicker控件输入出生年月，按回车键自动计算年龄，代码如下

UI界面

<Window x:Class="WPF通过出生日期计算年龄.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:WPF通过出生日期计算年龄"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800"><Grid><DatePicker Name="dteBirthday" HorizontalAlignment="Left" Margin="163,102,0,0" VerticalAlignment="Top" Height="26" Width="166" PreviewKeyDown="DteBirthday_PreviewKeyDown"/><TextBox Name="tbAge" HorizontalAlignment="Left" Height="23" Margin="163,158,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="76"/><ComboBox Name="cbAge" HorizontalAlignment="Left" Margin="260,158,0,0" VerticalAlignment="Top" Width="69"><ComboBoxItem Content="岁"/><ComboBoxItem Content="月"/><ComboBoxItem Content="日"/></ComboBox><Label Content="出生日期：" HorizontalAlignment="Left" Margin="81,101,0,0" VerticalAlignment="Top"/><Label Content="年      龄：" HorizontalAlignment="Left" Margin="81,156,0,0" VerticalAlignment="Top"/></Grid>
</Window>

后台代码：

注意，DatePicker键盘事件要用PreviewKeyDown而不用KeyDown事件

using System;
using System.Windows;
using System.Windows.Input;namespace WPF通过出生日期计算年龄
{/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();}private void DteBirthday_PreviewKeyDown(object sender, KeyEventArgs e){if (e.Key == Key.Enter){try{//dteBirthday为空时跳出DateTime dateTime = (DateTime)dteBirthday.SelectedDate.Value;}catch (Exception){return;}DateTime now = DateTime.Now;//当前时间用于对比if (dteBirthday.SelectedDate > DateTime.Now){MessageBox.Show("出生日期不能大于当前时间");return;}int age = now.Year - dteBirthday.SelectedDate.Value.Year;//计算年龄if (age > 1){if ((now.Month > dteBirthday.SelectedDate.Value.Month) || (now.Month == dteBirthday.SelectedDate.Value.Month && now.Day >= dteBirthday.SelectedDate.Value.Day)){tbAge.Text = age.ToString();cbAge.SelectedIndex = 0;}else{age--;tbAge.Text = age.ToString();cbAge.SelectedIndex = 0;}}else if (age == 1){if ((now.Month > dteBirthday.SelectedDate.Value.Month) || (now.Month == dteBirthday.SelectedDate.Value.Month && now.Day >= dteBirthday.SelectedDate.Value.Day)){tbAge.Text = "1";cbAge.SelectedIndex = 0;}else if (now.Month == dteBirthday.SelectedDate.Value.Month && now.Day < dteBirthday.SelectedDate.Value.Day){tbAge.Text = "11";cbAge.SelectedIndex = 1;}else{age = now.Month + 12 - dteBirthday.SelectedDate.Value.Month;tbAge.Text = age.ToString();cbAge.SelectedIndex = 1;}}else{if (now.Month > dteBirthday.SelectedDate.Value.Month){age = now.Month - dteBirthday.SelectedDate.Value.Month;tbAge.Text = age.ToString();cbAge.SelectedIndex = 1;}else if ((now.Month == dteBirthday.SelectedDate.Value.Month) && (now.Day > dteBirthday.SelectedDate.Value.Day)){age = now.Day - dteBirthday.SelectedDate.Value.Day;tbAge.Text = age.ToString();cbAge.SelectedIndex = 2;}else{tbAge.Text = "1";cbAge.SelectedIndex = 2;}}}}}
}

效果图