public DateInput()

{

// 该调用是 Windows.Forms 窗体设计器所必需的。

InitializeComponent();



tbMonth.ContextMenu = mnu ;

tbYear.ContextMenu = mnu ;

tbDay.ContextMenu = mnu ;

this.Height = 21 ;

this.Value = DateTime.Now ;

this.DateFormat = "yyyy-MM-dd" ;

if (!this.DesignMode)

CreateCalendar() ;

this.UpDown.Width = 16 ;

this.Refresh() ;



}

private void CreateCalendar()

{

Calendar = new MonthCalendar() ;

Calendar.Visible = true ;

Calendar.DateSelected+=new DateRangeEventHandler(Calendar_DateSelected);



frmCalendar = new Form() ;

frmCalendar.FormBorderStyle = FormBorderStyle.None ;

frmCalendar.TopMost = true ;

frmCalendar.Width = 270 ;

frmCalendar.Height = 145 ;

frmCalendar.Controls.Add(Calendar) ;

Calendar.Dock = DockStyle.Fill ;

frmCalendar.StartPosition = FormStartPosition.Manual ;

frmCalendar.Deactivate+=new EventHandler(Calendar_Leave);

frmCalendar.ShowInTaskbar = false ;

}

private void Calendar_DateSelected(object sender, System.Windows.Forms.DateRangeEventArgs e)

{

this.frmCalendar.Hide() ;

this.Value = this.Calendar.SelectionStart ;

this.tbDay.Focus() ;

}

private void Calendar_Leave(object sender, System.EventArgs e)

{

this.frmCalendar.Hide() ;

//this.Value = this.Calendar.SelectionStart ;

this.tbDay.Focus() ;

}

private void RefreshDisplay()

{

bool blGB = false ;

string strChar = "" ;

if (strDateFormat == "yyyy-MM-dd")

strChar = "-" ;

else if (strDateFormat == "yyyy.MM.dd")

strChar = "." ;

else if (strDateFormat == "yyyy/MM/dd")

strChar = "/" ;

else if (strDateFormat== "yyyy年MM月dd日")

blGB = true ;

else

strChar = strFomatChar ;

if (blGB)

{

lbSep1.Text = "年" ;

lbSep2.Text = "月" ;

lbSep3.Text = "日" ;

}

else

{

lbSep1.Text = strChar ;

lbSep2.Text = strChar ;

lbSep3.Text = "" ;

}

this.Refresh() ;

}





/// <summary>

/// 是不是空值

/// </summary>

public bool IsNull()

{