怎么用vb.net實現點擊按鈕顯示時間

設計界面雙擊那個按鈕(自動跳到代碼里)

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然后輸入 要顯示時間的那個Label.Text = DateTime.Now.ToString()

用VB.net做一個時間計時器

'添加一個label標簽名字label1 用來顯示時間

'再添加一個timer控件 名字timer1 interval屬性=1000 用來計時

'窗體添加代碼

Dim t As Date '用來記錄時間

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As _

System.EventArgs) Handles Timer1.Tick

t = t.AddSeconds(1)

Label1.Text = "登錄時間:" t.TimeOfDay.ToString

End Sub

怎么在VB.net中實時顯示時間

定時器中處理

Private?Sub?Form1_Load(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?MyBase.Load

Timer1.Interval?=?10?'10毫秒刷新一次

Timer1.Start()?'開啟定時器

End?Sub

Private?Sub?Timer1_Tick(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Timer1.Tick

Label1.Text?=?Now

End?Sub

VB.NET中用label顯示時間

Label1.Text?=?"12時演示:"?+?Now.ToString("yyyy-MM-dd?hh:mm:ss")

Label2.Text?=?"24時演示:"?+?Now.ToString("yyyy-MM-dd?HH:mm:ss")

Label3.Text?=?"UTC時演示:"?+?System.DateTime.UtcNow.ToString("yyyy-MM-dd?HH:mm:ss")

Label4.Text?=?"時間為不補0:"?+?Now.ToString("yyyy-MM-dd?H:m:s")

Label5.Text?=?"時間戳:"?+?CLng(System.DateTime.UtcNow.Subtract(New?Date(1970,?1,?1,?0,?0,?0)).TotalMilliseconds).ToString

想用vb.net做一個登陸界面 在這個界面顯示一個指針時鐘。就像下面的。誰有現成的例子么？

這個控件不是.net Fremawork自帶的，是用戶自己添加的控件，你可以去網上找這樣的控件，在VS里添加引用就可以了

vb.net開發(fā)簡單的時鐘程序？？高手救救我！

就

是

這

個

了

！

Hand類的代碼：

Public MustInherit Class Hand

Protected gp As GraphicsPath = New GraphicsPath()

Protected gpBase As GraphicsPath = Nothing

Protected midX As Integer = 150 ‘默認的窗體

Protected midY As Integer = 150 ‘中心位置

‘構造器，得到窗體中心位置

Public Sub New(ByVal theForm As Form1)

midX = (theForm.ClientRectangle.Left + theForm.ClientRectangle.Right) / 2

midY = (theForm.ClientRectangle.Top + theForm.ClientRectangle.Bottom) / 2

End Sub

MustOverride Sub Transform(ByVal d As DateTime)

‘繪制指針路徑

Overridable Sub Draw(ByVal g As Graphics)

Dim aPen As Pen = New Pen(Brushes.Black, 4F)

g.DrawPath(aPen, gp)

g.FillPath(Brushes.Black, gp)

aPen.Dispose()

End Sub

‘使用矩陣實現路徑（gp）的旋轉

Public Sub Rotate(ByVal angle As Double)

gp = CType(gpBase.Clone(), GraphicsPath)

Dim mTransform As Matrix = New Matrix()

mTransform.RotateAt(CType(angle,Single),NewPointF(midX,midY))

gp.Transform(mTransform)

End Sub

End Class

為了節(jié)省篇幅，上面的代碼省略了引入命名空間的語句。

下面是分針（MinuteHand）類的定義：

Public Class MinuteHand

Inherits Hand

‘構造器，生成繪制分針的路徑（gp）

Public Sub New(ByVal myForm As Form1)

MyBase.New(myForm)

gp.AddLine(midX, midY, midX, 45)

gp.AddLine(midX, 45, midX - 3, 50)

gp.AddLine(midX - 3, 50, midX + 3, 50)

gp.AddLine(midX + 3, 50, midX, 45)

gpBase = CType(gp.Clone(), GraphicsPath)

End Sub

‘Transform方法取得系統當前時間，并旋轉時鐘指針。

Public Overrides Sub Transform(ByVal d As DateTime)

Dim minuteTime As Double = (CDbl(d.Minute) + CDbl(d.Second / 60))

Dim angle As Double = (CDbl(minuteTime) / 60) * 360

Rotate(angle)

End Sub

End Class

對所有的指針旋轉的方法都是相同的，因此在基類中實現。由于時針和秒針的實現與分針相似，所不同者，只在于構造器中繪制的指針路徑不同和Transform方法中轉動的角度不同，在這里就不在贅述了。

另外還需要提一下的是畫時鐘表面的代碼，時鐘表面用ClockFace類來實現。這個類首先畫一個圓代表時鐘，然后畫上米老鼠的圖案，最后在相應的位置畫上數字1～12代表12個小時。

Public Sub Draw(ByVal g As Graphics)

DrawClockFace(g)

DrawImage(g)

DrawNumbers(g)

DrawPin(g)

End Sub

下面是ClockFace類的屬性：

Private ClockRectangle As Rectangle

Private ClockFont As Font = New Font("Arial", 12)

Private midPoint As Point

Private ClockImage As Bitmap

Private Const IMAGEX As Integer = 50

Private Const IMAGEY As Integer = 50

DrawClockFace方法用來畫時鐘表面：

Private Sub DrawClockFace(ByVal g As Graphics)

g.FillEllipse(Brushes.White, ClockRectangle.Left + 10, ClockRectangle.Top + 10, ClockRectangle.Width - 20, ClockRectangle.Height - 20)

g.DrawEllipse(Pens.Black, ClockRectangle.Left + 10, ClockRectangle.Top + 10, ClockRectangle.Width - 20, ClockRectangle.Height - 20)

End Sub

然后用Graphics對象的DrawImage方法畫出米老鼠的圖片：

Private Sub DrawImage(ByVal g As Graphics)

Dim nWidth As Integer = ClockImage.Width

Dim nHeight As Integer = ClockImage.Height

Dim destRect As Rectangle = New Rectangle(midPoint.X - IMAGEX / 2, midPoint.Y - IMAGEY / 2, IMAGEX, IMAGEY)

g.DrawImage(ClockImage, destRect)

End Sub

數字在時鐘上的位置是用sin和cos函數計算的：

Private Sub DrawNumbers(ByVal g As Graphics)

Dim count As Integer = 1

Dim a As Double

For a = 0 To 2 * Math.PI Step 2 * Math.PI / 12

Dim x As Double = (ClockRectangle.Width - 70) / 2 * Math.Cos(a - Math.PI / 3) + (ClockRectangle.Width - 70) / 2 + 25

Dim y As Double = (ClockRectangle.Width - 70) / 2 * Math.Sin(a - Math.PI / 3) + (ClockRectangle.Width - 70) / 2 + 20

g.DrawString(Convert.ToString(count), ClockFont, Brushes.Black, CType(x, Single), CType(y, Single), New StringFormat())

count += 1

Next

End Sub

最后是窗體文件（Form1.vb）:

Public Class Form1

Inherits System.Windows.Forms.Form

Private MyMinuteHand As MinuteHand

Private MyHourHand As HourHand

Private MySecondHand As SecondHand

Private TheClockFace As ClockFace

Private FirstTick As Boolean = False

‘在窗體的OnPaint事件中取得Graphics對象

Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)

If (FirstTick = False) Then Exit Sub

Dim g As Graphics = e.Graphics

TheClockFace.Draw(g)

MyHourHand.Draw(g)

MyMinuteHand.Draw(g)

MySecondHand.Draw(g)

TheClockFace.DrawPin(g)

End Sub

‘計時器事件

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

MySecondHand.Transform(DateTime.Now)

MyHourHand.Transform(DateTime.Now)

MyMinuteHand.Transform(DateTime.Now)

FirstTick = True

Invalidate()

當前題目：vb.net顯示時鐘的簡單介紹
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