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VB.net中怎么调用控件的事件

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“调用事件”有歧义，你的意思是不是下面两种：

调用事件处理方法

直接调用对象名.方法名

'例如有这样一个按钮点击事件处理程序

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

秒表.Start()

End Sub

'调用它直接用

Button1_Click(me, new EventArgs())

引发事件

Button1.Click.Invoke(me, new EventArgs())

另外 RaiseEvent 也可以引发事件，但不能使用 RaiseEvent 来引发派生窗体的控件事件，只有自己定义的类的事件才能用它引发。

如满意，请采纳，谢谢。

VB.NET跨线程操作控件

最简单的方法是

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

Control.CheckForIllegalCrossThreadCalls = False'加入这句代码就可以在别的线程访问窗体控件了

End Sub

你好，我想请教一下vb.net中怎么调用用户控件，谢谢！

与使用System.Windows.Forms命名空间中的控件的用法没有区别。

首先添加引用。

其次导入(Imports)命名空间。

接着就可以使用了：

1、要使用用户控件的实例成员，就先创建一个用户控件的实例，再通过实例名.实例成员名访问；

2、要使用用户控件的共享（Shared）成员，通过用户控件类名.共享成员名访问。

如果你问的是怎样创建自己的用户控件类：

1、继承类System.Windows.Forms.UserControl；

2、继承任何一个已经存在的控件类（只要这个控件类不是NotInheritable的就行）。

vb.net如何在串口接收事件中访问并修改另一个窗体的控件？

可以将Form1里的串口公开,然后在Form2里添加对DataReceived事件的处理

Form1.Designer.cs中将

private System.IO.Ports.SerialPort port;改为

publice System.IO.Ports.SerialPort port;

然后在Form2里加上

Form1.port.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(port_DataReceived);

最后在

void port_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)

{

在这里进行处理就可以了;

}

这个是C#的,VB的你自己转一下

vb.net如何调用窗体之间的控件

Public Class ks

Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

Public Sub New()

MyBase.New()

'该调用是 Windows 窗体设计器所必需的。

InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

'窗体重写 dispose 以清理组件列表。

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose()

End If

End If

MyBase.Dispose(disposing)

End Sub

'Windows 窗体设计器所必需的

Private components As System.ComponentModel.IContainer

'注意: 以下过程是 Windows 窗体设计器所必需的

'可以使用 Windows 窗体设计器修改此过程。

'不要使用代码编辑器修改它。

Friend WithEvents tx As System.Windows.Forms.TextBox

Friend WithEvents ty As System.Windows.Forms.TextBox

Friend WithEvents tz As System.Windows.Forms.TextBox

Friend WithEvents ok As System.Windows.Forms.Button

Friend WithEvents l1 As System.Windows.Forms.Label

Friend WithEvents l2 As System.Windows.Forms.Label

Friend WithEvents l3 As System.Windows.Forms.Label

System.Diagnostics.DebuggerStepThrough() Private Sub InitializeComponent()

Me.l1 = New System.Windows.Forms.Label

Me.l2 = New System.Windows.Forms.Label

Me.l3 = New System.Windows.Forms.Label

Me.tx = New System.Windows.Forms.TextBox

Me.ty = New System.Windows.Forms.TextBox

Me.tz = New System.Windows.Forms.TextBox

Me.ok = New System.Windows.Forms.Button

Me.SuspendLayout()

'

'l1

'

Me.l1.BackColor = System.Drawing.Color.FromArgb(CType(192, Byte), CType(192, Byte), CType(255, Byte))

Me.l1.Location = New System.Drawing.Point(8, 8)

Me.l1.Name = "l1"

Me.l1.Size = New System.Drawing.Size(200, 16)

Me.l1.TabIndex = 0

'

'l2

'

Me.l2.BackColor = System.Drawing.Color.FromArgb(CType(192, Byte), CType(192, Byte), CType(255, Byte))

Me.l2.Location = New System.Drawing.Point(8, 32)

Me.l2.Name = "l2"

Me.l2.Size = New System.Drawing.Size(200, 16)

Me.l2.TabIndex = 1

'

'l3

'

Me.l3.BackColor = System.Drawing.Color.FromArgb(CType(192, Byte), CType(192, Byte), CType(255, Byte))

Me.l3.Location = New System.Drawing.Point(8, 56)

Me.l3.Name = "l3"

Me.l3.Size = New System.Drawing.Size(200, 16)

Me.l3.TabIndex = 2

'

'tx

'

Me.tx.Location = New System.Drawing.Point(8, 80)

Me.tx.Name = "tx"

Me.tx.Size = New System.Drawing.Size(200, 25)

Me.tx.TabIndex = 3

Me.tx.Text = "请输入x"

'

'ty

'

Me.ty.Location = New System.Drawing.Point(8, 104)

Me.ty.Name = "ty"

Me.ty.Size = New System.Drawing.Size(200, 25)

Me.ty.TabIndex = 4

Me.ty.Text = "请输入y"

'

'tz

'

Me.tz.Location = New System.Drawing.Point(8, 128)

Me.tz.Name = "tz"

Me.tz.Size = New System.Drawing.Size(200, 25)

Me.tz.TabIndex = 5

Me.tz.Text = "请输入z"

'

'ok

'

Me.ok.BackColor = System.Drawing.Color.FromArgb(CType(192, Byte), CType(192, Byte), CType(255, Byte))

Me.ok.Location = New System.Drawing.Point(8, 160)

Me.ok.Name = "ok"

Me.ok.Size = New System.Drawing.Size(200, 64)

Me.ok.TabIndex = 6

Me.ok.Text = "ok"

'

'ks

'

Me.AutoScaleBaseSize = New System.Drawing.Size(8, 18)

Me.BackColor = System.Drawing.Color.FromArgb(CType(128, Byte), CType(128, Byte), CType(255, Byte))

Me.ClientSize = New System.Drawing.Size(216, 232)

Me.Controls.Add(Me.ok)

Me.Controls.Add(Me.tz)

Me.Controls.Add(Me.ty)

Me.Controls.Add(Me.tx)

Me.Controls.Add(Me.l3)

Me.Controls.Add(Me.l2)

Me.Controls.Add(Me.l1)

Me.Name = "ks"

Me.Text = "考试"

Me.ResumeLayout(False)

End Sub

#End Region

Dim x, y, z, a, b, c, d, aa, bb, cc As Single

Dim tts, alls As Single

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

x = Int(1 + 30 * Rnd())

y = Int(1 + 20 * Rnd())

z = Int(1 + 25 * Rnd())

a = Int(2 + 4 * Rnd())

b = Int(1 + a * 2 * Rnd())

c = Int(1 + b * 2 * Rnd())

d = Int(1 + c * 3 * Rnd())

aa = x + y + z

bb = a * x + b * y + c * z

cc = b * x + c * y + d * z

l1.Text = "x+y+z=" Str(aa)

l2.Text = Str(a) "x+" Str(b) "y+" Str(c) "z=" Str(bb)

l3.Text = Str(b) "x+" Str(c) "y+" Str(d) "z=" Str(cc)

End Sub

Private Sub ok_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ok.Click

If Val(tx.Text) = x And Val(ty.Text) = y And Val(tz.Text) = z Then

tts = tts + 1

End If

alls = alls + 1

tx.Text = ""

ty.Text = ""

tz.Text = ""

x = Int(1 + (1000 ^ 0.5) * Rnd())

y = Int(1 + (10000 ^ 0.4) * Rnd())

z = Int(1 + (100000 ^ 0.3) * Rnd())

a = Int(2 + 4 * Rnd())

b = Int(1 + a * 2 * Rnd())

c = Int(1 + b * 2 * Rnd())

d = Int(1 + c * 3 * Rnd())

aa = x + y + z

bb = a * x + b * y + c * z

cc = b * x + c * y + d * z

l1.Text = "x+y+z=" Str(aa)

l2.Text = Str(a) "x+" Str(b) "y+" Str(c) "z=" Str(bb)

l3.Text = Str(b) "x+" Str(c) "y+" Str(d) "z=" Str(cc)

End Sub

Private Sub ks_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Click

Dim lv As Single

If Not (alls = 0) Then

lv = Int(tts * 100000 / alls) / 1000

MsgBox(Str(lv) "%", , "正确率")

tx.Visible = False

ty.Visible = False

tz.Visible = False

ok.Visible = False

l1.Visible = False

l2.Visible = False

l3.Visible = False

Else

MsgBox("答题!", , "答题!")

End If

End Sub

End Class

vb.net 多线程 访问界面控件

建议你使用BackGroundWorker控件。将代码写入控件的事件中，使用它的Start方法就可以开始工作了。是与主程序同时进行的。