怎樣用vb.net做毫秒計(jì)時(shí)器（有沒有什么類似于ccrptmr之類的控件）

不需要控件就可以，用多線程的方式實(shí)現(xiàn)，在窗體上放一個(gè)Label和一個(gè)button按鈕，代碼如下：

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Imports?System.Threading

Public?Class?Form1

Dim?Start?As?Double

Dim?td?As?Thread

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

Label1.Text?=?"00:00:00?000"

Button1.Text?=?"開始"

End?Sub

Private?Sub?Button1_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button1.Click

If?Button1.Text?=?"開始"?Then

Button1.Text?=?"結(jié)束"

Start?=?DateAndTime.Timer

td?=?New?Thread(AddressOf?fun1)

td.Start()

Else

Button1.Text?=?"開始"

td.Abort()

End?If

End?Sub

'定義一個(gè)線程

Private?Sub?fun1()

Dim?elapsed?As?TimeSpan

Dim?Dg_txt?As?New?Dg(AddressOf?txt)

Do

elapsed?=?TimeSpan.FromMilliseconds((DateAndTime.Timer?-?Start)?*?1000)

Me.Invoke(Dg_txt,?elapsed.ToString,?Label1)

Thread.Sleep(100)

Loop

End?Sub

'定義一個(gè)委托

Delegate?Sub?Dg(ByVal?s?As?String,?ByVal?obj?As?Label)

Sub?txt(ByVal?s?As?String,?ByVal?obj?As?Label)

obj.Text?=?s

End?Sub

End?Class

vb.net毫秒計(jì)時(shí)器代碼問題

elapsed.Milliseconds 獲取毫秒。

每100毫秒，do中的代碼執(zhí)行一次，執(zhí)行時(shí)間將大于100毫秒，這是產(chǎn)生誤差的地方之一。invoke執(zhí)行一個(gè)方法txt，必須等txt里面的代碼運(yùn)行完畢，方法才能返回，期間占用的時(shí)間全是“誤差”。

無限循環(huán)，且沒有退出機(jī)制，停不下來。

用VB.NET設(shè)計(jì)一個(gè)以秒為基本單位的表，并且顯示在窗體上的步驟，并且給出關(guān)鍵代碼

是我以前自己設(shè)計(jì)的用來測(cè)試自己點(diǎn)鈔速度用的，希望是你需要的

以下是窗體的全部代碼

Public?Class?Form1

Dim?StartFlag?As?Boolean?=?False

Dim?secon?As?Integer

Dim?minut?As?Integer

'空格

Private?Sub?Form1_KeyUp(ByVal?sender?As?Object,?ByVal?e?As?System.Windows.Forms.KeyEventArgs)?Handles?Me.KeyUp

If?e.KeyCode?=?Keys.Space?Then

If?StartFlag?Then

StartFlag?=?False

Timer1.Enabled?=?False

If?Val(Strings.Right(Label1.Text,?2))??10?And?Val(Strings.Right(Label1.Text,?2))?=?0?Then?secon?=?0?:?minut?=?0?:?Label1.Text?=?"00:00"?:?Exit?Sub

ListBox1.Items.Add(Label1.Text.ToString)

ListBox1.SelectedItem?=?ListBox1.Items.Count?-?1

Label1.Focus()

Button1.Enabled?=?True

Label1.Text?=?"00:00"

secon?=?0

minut?=?0

Else

StartFlag?=?True

Timer1.Enabled?=?True

End?If

End?If

End?Sub

'加載

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

ListBox1.Items.Clear()

Label1.Text?=?"00:00"

Button1.Enabled?=?False

secon?=?0

minut?=?0

Label1.Focus()

End?Sub

'清空

Private?Sub?Button2_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button2.Click

Button1.Enabled?=?False

ListBox1.Items.Clear()

Label1.Focus()

End?Sub

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

secon?+=?1

If?secon?=?60?Then

secon?=?0

minut?+=?1

End?If

Dim?seconStr?As?String?=?secon

If?seconStr.Length?=?1?Then?seconStr?=?"0"?+?seconStr

Dim?minutStr?As?String?=?minut

If?minutStr.Length?=?1?Then?minutStr?=?"0"?+?minutStr

Label1.Text?=?minutStr?+?":"?+?seconStr

Label1.Focus()

End?Sub

Private?Sub?Button1_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button1.Click

Dim?SeconSun?As?Integer

If?ListBox1.Items.Count??0?Then

For?i?=?0?To?ListBox1.Items.Count?-?1

Dim?TemStr?As?String?=?ListBox1.Items.Item(i).ToString

Dim?TemInt1?As?Integer?=?Val(Strings.Right(TemStr,?2))

Dim?TemInt2?As?Integer?=?Val(Strings.Left(TemStr,?2))

Debug.Print(TemInt1.ToString)

Debug.Print(TemInt2.ToString)

SeconSun?+=?TemInt1?+?TemInt2?*?60

Debug.Print(SeconSun.ToString)

Next

TextBox1.Text?=?(SeconSun?/?ListBox1.Items.Count).ToString?+?"秒"

End?If

Label1.Focus()

End?Sub

End?Class