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vb.net窗体图标控件 vb显示窗体的代码
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vb.net 磁盘文件列表,界面如图,在.net下如何实现?
预先准备三个图标文件,用于树型控件中显示磁盘符号和文件夹的图像之用。
1、窗体上添加控件如下:
组合框控件 ComboBox1,树型控件 TreeView1,列表框控件 ListBox1,图像列表控件 ImageList1。
选中TreeView1,设置其ImageList属性为ImageList1。
2、设置属性
选中图像列表控件 ImageList1,在属性窗口里,选中属性Images,单击三个小点按钮,出现图像集合编辑器窗口,单击[添加按钮],一一把准备好的图标文件进行添加,注意先后次序,如果不符合要求可以通过上下移动按钮重新改变次序。完成后单击[确定]。
运行图如下:
完整代码如下:
Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'添加系统所有磁盘目录符号
For Each MyDrive As String In Environment.GetLogicalDrives()
ComboBox1.Items.Add(MyDrive)
Next
'显示第一个磁盘符号
ComboBox1.Text = ComboBox1.Items(0)
End Sub
'递归过程添加目录树
Public Sub AddDirectory(ByVal strFatherPath As String, ByVal strPath As String, ByVal nodeFather As TreeNode)
Dim i As Integer
Dim Mynode As New TreeNode
'先添加本目录
Mynode.Text = Strings.Replace(strPath, strFatherPath "\", "", , 1)
'为节点指定未被选中时显示的图标
Mynode.ImageIndex = 1
'为节点指定被选中时显示的图标
Mynode.SelectedImageIndex = 2
nodeFather.Nodes.Add(Mynode)
Application.DoEvents()
Try
Dim str() As String = Directory.GetDirectories(strPath)
'递归遍历该目录的子文件夹
For i = 0 To str.GetUpperBound(0)
AddDirectory(strPath, str(i), Mynode)
Next
Catch ex As Exception
Debug.WriteLine(ex.Message)
End Try
Mynode = Nothing
End Sub
'根据给出的盘符添加目录树
Private Sub AddRootDirectory(ByVal DiscSymbol As String)
Dim Nynode As New TreeNode
'先把磁盘盘符添加到树中
TreeView1.Nodes.Clear()
Nynode.ImageIndex = 0
Nynode.Text = DiscSymbol
Nynode.SelectedImageIndex = -1
TreeView1.Nodes.Add(Nynode)
Dim i As Integer
'获取磁盘根目录下的文件夹
Dim str() As String = Directory.GetDirectories(DiscSymbol "\")
For i = 0 To str.GetUpperBound(0)
'调用递归过程遍历该文件夹里的所有子文件夹,并添加到树型控件
AddDirectory(DiscSymbol, str(i), Nynode)
Next
Nynode = Nothing
End Sub
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
'根据磁盘符号的变更,显示根目录里的文件
ListBox1.Items.Clear()
For Each MyFile As String In System.IO.Directory.GetFiles(ComboBox1.Text)
ListBox1.Items.Add(MyFile)
Next
'根据磁盘符号的变更,重新显示目录树
Dim DiscSymbol As String
DiscSymbol = Microsoft.VisualBasic.Left(ComboBox1.Text, Len(ComboBox1.Text) - 1)
Call AddRootDirectory(DiscSymbol)
End Sub
'递归过程根据子目录寻找上级目录名--从而构成完整的目录路径
Private Sub AllPath(ByVal ThisNode As TreeNode, ByRef MyPathName As String)
If ThisNode.Level 1 Then
'该节点层数大于1,其父节点不是磁盘根目录
MyPathName = ThisNode.Parent.Text "\" MyPathName
Dim MyNode As TreeNode = ThisNode.Parent
Call AllPath(MyNode, MyPathName)
Else
'该节点层数等于1,其父节点就是磁盘根目录
MyPathName = ComboBox1.Text MyPathName
End If
End Sub
Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
'为了搜索选中的节点对应目录的文件,需要组成全路径
Dim MyAllPathName As String = TreeView1.SelectedNode.Text
Dim MyNode As TreeNode = TreeView1.SelectedNode
If TreeView1.SelectedNode.Level = 0 Then
'如果选中的是根节点
MyAllPathName = ComboBox1.Text
Else
'如果选中的是非根节点,调用递归过程组成全路径
Call AllPath(MyNode, MyAllPathName)
MyAllPathName = MyAllPathName "\"
End If
'根据路径,搜索文件名并显示
ListBox1.Items.Clear()
For Each MyFile As String In System.IO.Directory.GetFiles(MyAllPathName)
ListBox1.Items.Add(MyFile)
Next
End Sub
End Class
VB.net,在模块中怎样引用到窗体中的控件
在模块中引用到窗体中的控件,必须在该控件名之前由相应的窗体名作为前导,例如:
1,要引用窗体Form1中的控件TextBox1
MsgBox(Form1.TextBox1.Text)
2,要引用窗体Form2中的控件TextBox1
MsgBox(Form2.TextBox1.Text)
VB.NET 窗体图标和任务栏图标设置问题
任务栏图标就是窗体的ICON属性设置的图标,和标题栏的图标是完全一样的。如果你想做的不一样,那就用无边框窗体,自制一个标题栏
vb.net入门之分组控件:GroupBox控件
我们对控件进行分组的原因不外乎三个
为了获得清晰的用户界面而将相关的窗体元素进行可视化分组
编程分组 如对单选按钮进行分组
为了在设计时将多个控件作为一个单元来移动
在中 有GroupBox Panel TabControl这三个控件可以实现上面所提到的三个分组目的 所以我们称它们为分组控件
这三个控件在功用上十分的相似 特别是GroupBox和Panel控件 只存在一点细微的差别而已(这个差别是 只有GroupBox控件可以显示标题 而只有Panel控件可以有滚动条) 这里我们就先来了解GroupBox控件的使用
GroupBox(控件组)控件一般是作为其他控件的组的容器的形式存在的 这样有利于用户识别 使界面变得更加友好(GroupBox控件相当于Visual Basic以前版本的Frame控件) 使用控件组控件可以将一个窗体中的各种功能进一步进行分类 例如 将各种选项按钮控件分隔开
当移动单个GroupBox控件时 它所包含的所有控件也将一起移动
在大多数情况下 对控件组控件没有实际的操作 我们用它对控件进行分组 通常没有必要响应它的事件 不过 它的Name Text和Font等属性可能会经常被修改 以适应应用程序在不同阶段的要求
GroupBox控件在工具箱中的图标如图所示
一 GroupBox控件的常用属性
Anchor和Dock 这两个属性是所有有用户界面的控件都有的定位属性 这里就不啰嗦了
Name属性 标识控件的对象名称
Text属性 显示在GroupBox控件右上方的标题文字 可以用来标识该控件组的描述
Font和ForeColor属性 用于改变GroupBox控件的文字大小以及文字的颜色 需要注意的时候 它不单改变GroupBox控件的Text属性的文字外观 同时也改变其内部控件的显示的Text属性的文字外观
二 创建一组控件
在窗体上放置GroupBox控件 从工具箱中拖放一个GroupBox控件到窗体上的合适位置 调整大小
在属性窗口中改变GroupBox控件的Text属性 作为它的标题
在GroupBox控件内拖放其它需要的控件 例如RadioButton控件
设置示例 如图一所示
图一 用控件组控件对单选按钮分组
我们在拖动单个GroupBox控件的时候 它内部的控件也会随着移动 以保持和GroupBox的相对位置不变 同理 删除GroupBox控件时 它所包含的所有控件也会被删除掉
当我们调整GroupBox控件所包含的控件的Anchor和Dock属性的时候 其参照物将不是Form窗体 而是GroupBox控件了
三 编程添加GroupBox控件以及它所包含的控件
虽然GroupBox控件是在设计时用视图设计布局效果最好 但是无可避免地 很多特殊情况下也是需要在运行做添加控件到控件组中的 这里我们就用代码来完成上图一界面的绘制
动态添加控件一般需要经过下面三个步骤
创建要添加的控件实例
设置新控件的属性
将控件添加到父控件的 Controls 集合
在Form 代码的任意位置增加初始化控件的过程InitializeControl() 代码如下所示
Sub InitializeControl()
首先添加Label和TextBox控件
Dim Label As New System Windows Forms Label
Dim TextBox As New System Windows Forms TextBox
Label
Label Location = New System Drawing Point( )
Label Name = Label
Label Size = New System Drawing Size( )
Label TabIndex =
Label Text = 户主姓名
TextBox
TextBox Location = New System Drawing Point( )
TextBox Name = TextBox
TextBox Size = New System Drawing Size( )
TextBox TabIndex =
TextBox Text =
把它们添加到父控件Form 的Controls集合中
Me Controls Add(TextBox )
Me Controls Add(Label )
添加三个GroupBox控件
Dim GroupBox As New System Windows Forms GroupBox
Dim GroupBox As New System Windows Forms GroupBox
Dim GroupBox As New System Windows Forms GroupBox
GroupBox
GroupBox BackColor = System Drawing SystemColors Control
GroupBox Location = New System Drawing Point( )
GroupBox Name = GroupBox
GroupBox Size = New System Drawing Size( )
GroupBox TabIndex =
GroupBox TabStop = False
GroupBox Text = 性别
GroupBox
GroupBox Location = New System Drawing Point( )
GroupBox Name = GroupBox
GroupBox Size = New System Drawing Size( )
GroupBox TabIndex =
GroupBox TabStop = False
GroupBox Text = 单元
GroupBox
GroupBox Location = New System Drawing Point( )
GroupBox Name = GroupBox
GroupBox Size = New System Drawing Size( )
GroupBox TabIndex =
GroupBox TabStop = False
GroupBox Text = 楼层
把它们添加到父控件Form 的Controls集合中
Me Controls Add(GroupBox )
Me Controls Add(GroupBox )
Me Controls Add(GroupBox )
添加RadioButton控件并分别绘制在GroupBox控件内
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
Dim RadioButton As New System Windows Forms RadioButton
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 男性
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 女性
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 二单元
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 三单元
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 一单元
RadioButton
RadioButton BackColor = System Drawing SystemColors Control
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 四单元
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 二楼
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 三楼
RadioButton
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 一楼
RadioButton
RadioButton BackColor = System Drawing SystemColors Control
RadioButton Location = New System Drawing Point( )
RadioButton Name = RadioButton
RadioButton Size = New System Drawing Size( )
RadioButton TabIndex =
RadioButton Text = 四楼
分别把它们添加到父控件GroupBox的Controls集合中
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
GroupBox Controls Add(RadioButton )
End Sub
把上一页的代码复制添加后 把控件初始化过程InitializeControl()过程添加到Form 的New构造函数中 如下图二所示
图二 在New构造函数中添加过程InitializeControl()
现在按F 运行 Form 的窗体控件布局(如下图三所示)是不是和我们手工布局的图一的布局是一样的呢?
lishixinzhi/Article/program/ASP/201311/21749
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