form1.vb

Source code for VB.NET book - Chapter 1.

Public Class Form1
    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 ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'ComboBox1
        '
        Me.ComboBox1.Items.AddRange(New Object() {"Visual Basic", "Visual C++", "Delphi"})
        Me.ComboBox1.Location = New System.Drawing.Point(48, 16)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(144, 21)
        Me.ComboBox1.TabIndex = 0
        Me.ComboBox1.Text = "<请选择>"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(24, 64)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(96, 20)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = ""
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(144, 64)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "添加到组合框"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(40, 120)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(168, 24)
        Me.Label1.TabIndex = 3
        Me.Label1.Text = "请选择你要学的编程语言"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(264, 182)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.ComboBox1)
        Me.Name = "Form1"
        Me.Text = "组合框"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ComboBox1.Items.Add(TextBox1.Text)
        TextBox1.Text = ""
    End Sub

    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Select Case ComboBox1.SelectedIndex
            Case 0
                Label1.Text = "你选择了Visual Basic！"
            Case 1
                Label1.Text = "你选择了Visual C++！"
            Case 2
                Label1.Text = "你选择了Delphi！"
        End Select
    End Sub
End Class