WPF通过出生日期计算年龄

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

思路其实很简单，先画一个树状图理清思路

 

在将共用部分合并

项目完整源码地址

https://gitee.com/xiaoniushengdaniu/wpf_birth_date_calculates_age