WPF自定义选择年月控件详解

后台代码：

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;
using System.ComponentModel;

namespace SunCreate.CombatPlatform.Client
{
  /// <summary>
  /// 
  /// </summary>
  public partial class DateMonthPicker : UserControl, INotifyPropertyChanged
  {
    private DateTime _selectedMonth;
    public static DependencyProperty selectedTimeProperty;

    static DateMonthPicker()
    {
      selectedTimeProperty = DependencyProperty.Register("SelectedMonth", typeof(DateTime), typeof(DateMonthPicker), new PropertyMetadata(DateTime.Now, new PropertyChangedCallback(SelectedMonthChanged)));
    }

    public DateMonthPicker()
    {
      InitializeComponent();

      int currentYear = DateTime.Now.Year;
      int currentMonth = DateTime.Now.Month;
      List<object> yearList = new List<object>();
      for (int i = currentYear - 20; i <= currentYear; i++)
      {
        yearList.Add(new { Text = i.ToString() });
      }
      cbYear.ItemsSource = yearList;

      cbMonth.ItemsSource = new List<object>() { 
        new { Text = "1" },
        new { Text = "2" },
        new { Text = "3" },
        new { Text = "4" },
        new { Text = "5" },
        new { Text = "6" },
        new { Text = "7" },
        new { Text = "8" },
        new { Text = "9" },
        new { Text = "10" },
        new { Text = "11" },
        new { Text = "12" }};

      this._selectedMonth = DateTime.Now;
    }

    private void UserControl_Loaded(object sender, RoutedEventArgs e)
    {
      cbYear.SelectedValue = _selectedMonth.Year.ToString();
      cbMonth.SelectedValue = _selectedMonth.Month.ToString();
    }

    private static void SelectedMonthChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
      (obj as DateMonthPicker).ChangeSelect(e.NewValue);
    }

    private void ChangeSelect(object value)
    {
      _selectedMonth = (DateTime)value;
      cbYear.SelectedValue = _selectedMonth.Year.ToString();
      cbMonth.SelectedValue = _selectedMonth.Month.ToString();
    }

    public DateTime SelectedMonth
    {
      get { return (DateTime)this.GetValue(DateMonthPicker.selectedTimeProperty); }
      set { this.SetValue(DateMonthPicker.selectedTimeProperty, value); }
    }

    public DateTime StartDay
    {
      get
      {
        return this._selectedMonth.AddDays(1 - this._selectedMonth.Day).Date;
      }
    }

    public DateTime EndDay
    {
      get
      {
        return this.StartDay.AddMonths(1).AddDays(-1);
      }
    }

    #region INotifyPropertyChanged 成员
    public event PropertyChangedEventHandler PropertyChanged;
    private void SendPropertyChanged(String propertyName)
    {
      if (PropertyChanged != null)
        this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
    #endregion

    private void cbYear_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
      ComboBox cb = sender as ComboBox;
      if (this._selectedMonth != DateTime.MinValue && cb.SelectedValue != null)
      {
        this._selectedMonth = new DateTime(Convert.ToInt32(cb.SelectedValue), this._selectedMonth.Month, 1);
        SelectedMonth = this._selectedMonth;
      }
    }

    private void cbMonth_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
      ComboBox cb = sender as ComboBox;
      if (this._selectedMonth != DateTime.MinValue && cb.SelectedValue != null)
      {
        this._selectedMonth = new DateTime(this._selectedMonth.Year, Convert.ToInt32(cb.SelectedValue), 1);
        SelectedMonth = this._selectedMonth;
      }
    }
  }
}


								 
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