VB.NET 如何做 控件

用vs.net创建控件项目，其他的和vb类似...

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新建项目-windows 窗体控件库

vb.net自定义控件

mytest1是继承自什么类，通常应该继承自UerControl，虽然你这样也能编译通过，但实际上没有任何意义。所以你先改了再说。继承之后，编译，工具箱就会多这么个控件，拖动到Form1上，这样按钮下就不用再new了。然后你再来问。

vb.net 控件制作

先生成dataset,然后用datarow装载dataset的需要编辑的记录，再把datarow的值赋给textbox的text显示给用户编辑，用户修改后，把textbox的text赋值回给datarow，最后update dataset更新数据.

VB.NET中如何动态创建控件

Option Explicit

Private WithEvents NewTextBox As TextBox

'通过使用WithEvents关键字声明一个对象变量为新的命令按钮

Private Sub Command1_Click()

If NewTextBox Is Nothing Then

Set NewTextBox = Controls.Add("VB.TextBox", "cmdNew", Form1)

NewTextBox.Move 200, 200

NewTextBox.Width = Form1.Width - 450

NewTextBox.Height = Form1.Height - 1400

NewTextBox.Visible = True

End If

End Sub

Private Sub Command2_Click()

If NewTextBox Is Nothing Then

Exit Sub

Else

Controls.Remove NewTextBox

Set NewTextBox = Nothing

End If

End Sub

vb.net 窗口控件的制作

把你的控件 继承Panel类，而不要集成UserControl类。

你可以在集成Panel后，往Panel里面加一些你自己的方法或Control来实现你需要的功能。向里面拖控件的功能则由Panel来控制，你自己就不用管了。

VB.net 如何编写用户控件？

Public Class UserControl1

#Region "变量"

Dim Down_Color As Color = Color.Blue

Dim UP_Color As Color = Color.Gray

Dim Mode As Short = 0

Dim flag As Boolean

Dim offset_X As Integer

Dim offset_Y As Integer

Dim Mouse_P As Point

#End Region

#Region "属性"

'按下颜色

Public Property _DownColor As Color

Get

Return Down_Color

End Get

Set(ByVal value As Color)

Down_Color = value

End Set

End Property

'弹起颜色

Public Property _UpColor As Color

Get

Return UP_Color

End Get

Set(ByVal value As Color)

UP_Color = value

End Set

End Property

'滑动模式 0-横 1-竖

Public Property _Mode As Short

Get

Return Mode

End Get

Set(ByVal value As Short)

Mode = value

End Set

End Property

#End Region

Private Sub UserControl1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Me.BackColor = UP_Color

End Sub

'鼠标按下

Private Sub UserControl1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown

Me.BackColor = Down_Color

Mouse_P = e.Location

flag = True

End Sub

'鼠标移动

Private Sub UserControl1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove

If flag = False Then Exit Sub

Select Case Mode

Case 0 '横向·

offset_X = e.X - Mouse_P.X

If Me.Location.X + offset_X + Me.Width = Me.ParentForm.Width Or Me.Location.X + offset_X = 0 Then

flag = False

Else

Me.Location = New Point(Me.Location.X + offset_X, Me.Location.Y)

End If

Case 1 '竖向·

offset_Y = e.Y - Mouse_P.Y

If Me.Location.Y + offset_Y + Me.Height + 30 = Me.ParentForm.Height Or Me.Location.Y + offset_Y = 0 Then

flag = False

Else

Me.Location = New Point(Me.Location.X, Me.Location.Y + offset_Y)

End If

End Select

End Sub

'鼠标弹起

Private Sub UserControl1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp

Me.BackColor = UP_Color

flag = False

End Sub

End Class

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