vb.net控件说明,vb控件大全使用详解书

vb.net 控件属性设置

如控件自身无法设置滚动条，那就在父容器控件中（如FORM）使用滚动条解决问题。另外，也可将日期控件放在弹出窗口中，

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vb.net中，控件的tag属性是什么意思？

从tag这个名字就可以看出，这是一个标签属性，或者说是附注、标注、说明，一般情况下是没什么作用的，但是可以用它来保存一些临时性的数据，这样可以不用另外定义临时变量。你说的例子就是这样，是把obj这个对象的大小和位置临时保存在tag属性里，在后面的语句里就可以随时调用了。

VB.NET中使用AspNetPager控件的详细用法

AspNetPager简单使用方法 AspNetPager作为分页工具,常常用于绑定数据控件,如DataGrid , Repeater等

在这里,简单讲解下 绑定 Repeater 控件的方法,其余控件绑定方法类似:

'全局变量 i 用于 读取 数据集记录的条数(注意:读取一次就够了)

Dim i As New Integer

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

If i = 0 Then

con = New SqlConnection(ConfigurationManager.ConnectionStrings("NEWS_ConnectionString").ConnectionString)

con.Open()

cmd = New SqlCommand()

cmd.Connection = con

cmd.CommandText = "select count(*) from XWNRB "

'AspNetPager控件 可见

Me.AspNetPager1.Visible = True

'AspNetPager控件 每页显示大小为10条记录

Me.AspNetPager1.PageSize = 10

'AspNetPager控件 记录总的记录条数

Me.AspNetPager1.RecordCount = Convert.ToInt32(cmd.ExecuteScalar())

'AspNetPager控件 数据绑定

Me.SHOW_DATA_LIST()

i = i + 1

con.Close()

End If

End Sub

Protected Sub SHOW_DATA_LIST()

con = New SqlConnection(ConfigurationManager.ConnectionStrings("NEWS_ConnectionString").ConnectionString)

sql_Text = "select * from XWNRB where "

da = New SqlDataAdapter(sql_Text, con)

Dim ds As New Data.DataSet

'第一个参数为存储入的数据集为ds

'第二个参数为存储的起始记录序号

'第三个参数为存储的记录每页条数

'第四个参数为存储入的数据集ds中的具体某个表

da.Fill(ds, Me.AspNetPager1.PageSize * (Me.AspNetPager1.CurrentPageIndex - 1), Me.AspNetPager1.PageSize, "NEWS_LIST")

'真正绑定

Me.Repeater2.DataSource = ds.Tables("NEWS_LIST").DefaultView

Me.Repeater2.DataBind()

End Sub

'即每次点击新的页面,或者点击 Pre,Next,Last.....时候都会触发这个事件

Protected Sub AspNetPager1_PageChanged(ByVal src As Object, ByVal e As Wuqi.Webdiyer.PageChangedEventArgs) Handles AspNetPager1.PageChanged

'更新当前所在的页数序列

Me.AspNetPager1.CurrentPageIndex = e.NewPageIndex

'更新完后绑定

Me.SHOW_DATA_LIST()

End Sub

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

vb.net 文件夹操作

vb.net使用控件FolderBrowserDialog1,在程序中:

'设置对话框中在树视图控件上显示的说明文本

Me.FolderBrowserDialog1.Description

=

"请选择输出报表所在路径:"

'设置从其开始浏览的根文件夹

Me.FolderBrowserDialog1.SelectedPath

=

"c:\"

If

Me.FolderBrowserDialog1.ShowDialog()

=

DialogResult.OK

Then

'取得全路径（包含文件名）

reportPath1

=

System.IO.Path.GetFullPath(Me.FolderBrowserDialog1.SelectedPath)

'设定text显示文件名

txtReport1.Text

=

reportPath1

setReportList()

End

If

在setReportList()中针对你所需要的文件进行操作等

如何声明控件属性 vb.net

Public Class ControlValue

Inherits Control

''' summary

''' 获取或设置控件的值。

''' /summary

System.ComponentModel.Browsable(True)

System.ComponentModel.Category("布局")

System.ComponentModel.Description("获取或设置控件的值。")

Public Property Value As String

End Class