form1.vb

vb 应用实例 简单应用 ddddddddddddddddddddddddddddddddd

Imports System.Text  'for StringBuilder
Imports System.IO   'for StringWriter
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form 设计工具产生的程序代码 "

    Public Sub New()
        MyBase.New()

        '此调用为 Windows Form 设计工具的必要项。
        InitializeComponent()

        '在 InitializeComponent() 呼叫之后加入所有的初始设定

    End Sub

    'Form 覆盖 Dispose 以清除组件清单。
    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

    '为 Windows Form 设计工具的必要项
    Private components As System.ComponentModel.IContainer

    '注意: 以下为 Windows Form 设计工具所需的程序
    '您可以使用 Windows Form 设计工具进行修改。
    '请勿使用程序代码编辑器来修改这些程序。
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents Button4 As System.Windows.Forms.Button
    Friend WithEvents Button5 As System.Windows.Forms.Button
    Friend WithEvents Button6 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.Label4 = New System.Windows.Forms.Label()
        Me.Button2 = New System.Windows.Forms.Button()
        Me.Button3 = New System.Windows.Forms.Button()
        Me.Button4 = New System.Windows.Forms.Button()
        Me.Button5 = New System.Windows.Forms.Button()
        Me.Button6 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(8, 40)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(88, 24)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "字符串处理"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(64, 16)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(344, 16)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "活在当下! Accept now, love now, enjoy now!"
        '
        'Label4
        '
        Me.Label4.AutoSize = True
        Me.Label4.Location = New System.Drawing.Point(8, 16)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(54, 15)
        Me.Label4.TabIndex = 4
        Me.Label4.Text = "原字符串："
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(8, 72)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(88, 24)
        Me.Button2.TabIndex = 5
        Me.Button2.Text = "寻找"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(8, 136)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(88, 23)
        Me.Button3.TabIndex = 6
        Me.Button3.Text = "Join/Split"
        '
        'Button4
        '
        Me.Button4.Location = New System.Drawing.Point(8, 104)
        Me.Button4.Name = "Button4"
        Me.Button4.Size = New System.Drawing.Size(88, 24)
        Me.Button4.TabIndex = 7
        Me.Button4.Text = "比较"
        '
        'Button5
        '
        Me.Button5.Location = New System.Drawing.Point(8, 168)
        Me.Button5.Name = "Button5"
        Me.Button5.Size = New System.Drawing.Size(88, 23)
        Me.Button5.TabIndex = 8
        Me.Button5.Text = "StringBuilder"
        '
        'Button6
        '
        Me.Button6.Location = New System.Drawing.Point(8, 200)
        Me.Button6.Name = "Button6"
        Me.Button6.Size = New System.Drawing.Size(88, 23)
        Me.Button6.TabIndex = 9
        Me.Button6.Text = "StringWriter"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 15)
        Me.ClientSize = New System.Drawing.Size(408, 262)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button6, Me.Button5, Me.Button4, Me.Button3, Me.Button2, Me.Label4, Me.Label1, Me.Button1})
        Me.Name = "Form1"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Strings"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim str1 As String = Label1.Text
        Dim str2 As String
        str2 = "Insert(2, '今天'): " & vbTab & str1.Insert(2, "今天") & vbCrLf
        str2 += "Remove(2, 1): " & vbTab & str1.Remove(2, 1) & vbCrLf
        str2 += "Replace('now', 'it'): " & vbTab & str1.Replace("now", "it") & vbCrLf
        MsgBox(str2)

        str2 = "PadLeft(50): " & vbTab & str1.PadLeft(50) & vbCrLf
        str2 += "PadLeft(50, '?'): " & vbTab & str1.PadLeft(50, "?") & vbCrLf
        str2 += "PadRight(50): " & vbTab & str1.PadRight(50) & vbCrLf
        str2 += "PadRight(50, '_'): " & vbTab & str1.PadRight(50, "_") & vbCrLf
        MsgBox(str2)

        str2 = "Substring(2): " & vbTab & str1.Substring(2) & vbCrLf
        str2 += "Substring(2, 2): " & vbTab & str1.Substring(2, 2) & vbCrLf

        str2 += "ToUpper: " & vbTab & str1.ToUpper & vbCrLf
        str2 += "ToLower: " & vbTab & str1.ToLower & vbCrLf
        str2 += "Trim:         " & vbTab & ("   " & str1 & "   ").Trim & vbCrLf
        str2 += "Trim('?'):     " & vbTab & ("???" & str1 & "???").Trim("?") & vbCrLf

        str2 += "TrimStart: " & vbTab & ("   " & str1 & "   ").TrimStart & vbCrLf
        str2 += "TrimStart('?'): " & vbTab & ("???" & str1 & "???").TrimStart("?") & vbCrLf

        str2 += "TrimEnd: " & vbTab & ("   " & str1 & "   ").TrimEnd & vbCrLf
        str2 += "TrimEnd('?'): " & vbTab & ("???" & str1 & "???").TrimEnd("?") & vbCrLf
        MsgBox(str2)

        str2 = "String.Concat('Accept now, ', 'love now, ', 'enjoy now!'): " & vbTab & String.Concat("Accept now, ", "love now, ", "enjoy now!") & vbCrLf

        str2 += "String.Format('购买 {0:N0} 项, 计 {1:C} 元.', 10, 1212.42): " & vbTab & String.Format("购买 {0:N0} 项, 计 {1:C} 元.", 10, 1212.42) & vbCrLf
        MsgBox(str2)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim str1 As String = Label1.Text
        Dim str2 As String
        str2 = "IndexOf('now'): " & vbTab & vbTab & vbTab & str1.IndexOf("now").ToString & vbCrLf
        str2 += "IndexOf('now', 2): " & vbTab & vbTab & vbTab & str1.IndexOf("now", 2).ToString & vbCrLf
        str2 += "IndexOf('now', 3, 16): " & vbTab & vbTab & str1.IndexOf("now", 3, 16).ToString & vbCrLf

        str2 += "LastIndexOf('now'): " & vbTab & vbTab & str1.LastIndexOf("now").ToString & vbCrLf
        str2 += "LastIndexOf('now', 20): " & vbTab & vbTab & str1.LastIndexOf("now", 20).ToString & vbCrLf
        str2 += "LastIndexOf('now', 30, 20): " & vbTab & vbTab & str1.LastIndexOf("now", 30, 20).ToString & vbCrLf
        MsgBox(str2)

        str2 = "IndexOfAny('now'): " & vbTab & vbTab & str1.IndexOfAny("now").ToString & vbCrLf
        str2 += "IndexOfAny('now', 2): " & vbTab & vbTab & str1.IndexOfAny("now", 2).ToString & vbCrLf
        str2 += "IndexOfAny('now', 3, 16): " & vbTab & vbTab & str1.IndexOfAny("now", 3, 16).ToString & vbCrLf

        str2 += "LastIndexOfAny('now'): " & vbTab & vbTab & str1.LastIndexOfAny("now").ToString & vbCrLf
        str2 += "LastIndexOfAny('now', 20): " & vbTab & vbTab & str1.LastIndexOfAny("now", 20).ToString & vbCrLf
        str2 += "LastIndexOfAny('now', 30, 20): " & vbTab & str1.LastIndexOfAny("now", 30, 20).ToString & vbCrLf

        MsgBox(str2)
        str2 = "StartsWith('活在'): " & vbTab & vbTab & vbTab & str1.StartsWith("活在").ToString & vbCrLf
        str2 += "EndsWith('enjoy now!'): " & vbTab & vbTab & str1.EndsWith("enjoy now!").ToString & vbCrLf

        MsgBox(str2)
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim str1 As String = Label1.Text
        Dim str2 As String
        Dim strAry1 As Array = str1.Split
        str2 += "Split: " & vbTab & strAry1(2).ToString & vbCrLf

        Dim strAry2 As Array = str1.Split(",")
        str2 += "Split(','): " & vbTab & strAry2(2).ToString & vbCrLf

        Dim str3 As String = str1.Join(",", strAry2)
        str2 += "String.Join(',', strAry2): " & vbTab & String.Join(",", strAry2) & vbCrLf

        MsgBox(str2)


    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        Dim str1 As String = Label1.Text
        Dim str2 As String

        'same: 0
        str2 += "String.Compare(str1, 'now'): " & vbTab & String.Compare(str1, "now").ToString & vbCrLf
        str2 += "String.Compare(str1, str1): " & vbTab & String.Compare(str1, str1).ToString & vbCrLf

        str2 += "String.Compare(str1, str1.ToUpper, True): " & vbTab & String.Compare(str1, str1.ToUpper, True).ToString & vbCrLf
        str2 += "String.Compare(str1, str1.ToUpper, False): " & vbTab & String.Compare(str1, str1.ToUpper, False).ToString & vbCrLf

        '不考虑本地的国家语言或文化特性
        str2 += "String.CompareOrdinal(str1, str1): " & vbTab & String.CompareOrdinal(str1, str1).ToString & vbCrLf

        MsgBox(str2)
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        'need to Imports System.Text
        Dim sb As New StringBuilder("活在! Accept now, love now, enjoy now!")
        sb.Insert(2, "当下")
        sb.Remove(6, 12)
        sb.Replace("now", "it")
        sb.AppendFormat(" {0} 生活 {1} 次", 1, 2)
        MsgBox(sb.ToString)
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        'need to Imports System.IO
        Dim sw As New StringWriter()

        Dim strAry() As String = {"Accept now", "love now", "enjoy now!"}
        sw.Write(strAry(0))
        sw.Write(", ")
        sw.Write(strAry(1))
        sw.Write(", ")
        sw.WriteLine(strAry(2))
        MsgBox(sw.ToString)
        sw.WriteLine(String.Format("{0}, {1}, {2}", strAry(0), strAry(1), strAry(2)))
        MsgBox(sw.ToString)
    End Sub
End Class