form1.vb

用vb.net写的基于c/s结构的进销存程序设计源代码

Public Class Form1
    Inherits System.Windows.Forms.Form
    Dim lVar1 As Long
    Dim lVar2 As Long = 0

#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

    '窗体重写处置以清理组件列表。
    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 bnMessage As System.Windows.Forms.Button
    Friend WithEvents bnSource As System.Windows.Forms.Button
    Friend WithEvents bnToString As System.Windows.Forms.Button
    Friend WithEvents bnAllErrors As System.Windows.Forms.Button
    Friend WithEvents bnOthers As System.Windows.Forms.Button
    Friend WithEvents bnUsers As System.Windows.Forms.Button
    Friend WithEvents txtErrorMsg As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.bnMessage = New System.Windows.Forms.Button()
        Me.bnSource = New System.Windows.Forms.Button()
        Me.bnToString = New System.Windows.Forms.Button()
        Me.bnAllErrors = New System.Windows.Forms.Button()
        Me.bnOthers = New System.Windows.Forms.Button()
        Me.bnUsers = New System.Windows.Forms.Button()
        Me.txtErrorMsg = New System.Windows.Forms.TextBox()
        Me.SuspendLayout()
        '
        'bnMessage
        '
        Me.bnMessage.Location = New System.Drawing.Point(56, 16)
        Me.bnMessage.Name = "bnMessage"
        Me.bnMessage.Size = New System.Drawing.Size(80, 24)
        Me.bnMessage.TabIndex = 0
        Me.bnMessage.Text = "Message"
        '
        'bnSource
        '
        Me.bnSource.Location = New System.Drawing.Point(56, 56)
        Me.bnSource.Name = "bnSource"
        Me.bnSource.Size = New System.Drawing.Size(80, 24)
        Me.bnSource.TabIndex = 1
        Me.bnSource.Text = "Source"
        '
        'bnToString
        '
        Me.bnToString.Location = New System.Drawing.Point(56, 96)
        Me.bnToString.Name = "bnToString"
        Me.bnToString.Size = New System.Drawing.Size(80, 24)
        Me.bnToString.TabIndex = 2
        Me.bnToString.Text = "ToString"
        '
        'bnAllErrors
        '
        Me.bnAllErrors.Location = New System.Drawing.Point(56, 136)
        Me.bnAllErrors.Name = "bnAllErrors"
        Me.bnAllErrors.Size = New System.Drawing.Size(80, 24)
        Me.bnAllErrors.TabIndex = 3
        Me.bnAllErrors.Text = "AllErrors"
        '
        'bnOthers
        '
        Me.bnOthers.Location = New System.Drawing.Point(56, 176)
        Me.bnOthers.Name = "bnOthers"
        Me.bnOthers.Size = New System.Drawing.Size(80, 24)
        Me.bnOthers.TabIndex = 4
        Me.bnOthers.Text = "Others"
        '
        'bnUsers
        '
        Me.bnUsers.Location = New System.Drawing.Point(56, 216)
        Me.bnUsers.Name = "bnUsers"
        Me.bnUsers.Size = New System.Drawing.Size(80, 24)
        Me.bnUsers.TabIndex = 5
        Me.bnUsers.Text = "Users"
        '
        'txtErrorMsg
        '
        Me.txtErrorMsg.Location = New System.Drawing.Point(152, 216)
        Me.txtErrorMsg.Name = "txtErrorMsg"
        Me.txtErrorMsg.Size = New System.Drawing.Size(96, 21)
        Me.txtErrorMsg.TabIndex = 6
        Me.txtErrorMsg.Text = ""
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.txtErrorMsg, Me.bnUsers, Me.bnOthers, Me.bnAllErrors, Me.bnToString, Me.bnSource, Me.bnMessage})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub bnMessage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnMessage.Click
        Try
            lVar1 = 8 / lVar2
        Catch eErr As System.Exception
            MsgBox(eErr.Message)

        End Try
    End Sub

    Private Sub bnSource_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnSource.Click
        Try
            lVar1 = 8 / lVar2
        Catch eErr As System.Exception
            MsgBox(eErr.Source)
        End Try
    End Sub

    Private Sub bnToString_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnToString.Click
        Try
            lVar1 = 8 / lVar2
        Catch eErr As System.Exception
            MsgBox(eErr.ToString())
        End Try
    End Sub

    Private Sub bnAllErrors_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnAllErrors.Click
        Try
            lVar1 = 8 / lVar2
        Catch
            MsgBox("错误")
        End Try
    End Sub

    Private Sub bnOthers_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnOthers.Click
        Try
            lVar1 = 8 / lVar2
        Catch eErr As NullReferenceException
            MsgBox("错误")
        End Try
    End Sub
    Private Sub HaveValue()
        Dim MyError As New Exception("Text Box不可空白")
        MyError.Source = "HaveValue"
        If txtErrorMsg.Text.Length = 0 Then
            Throw MyError
        End If
    End Sub

    Private Sub bnUsers_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnUsers.Click
        Try
            HaveValue()
            lVar1 = 8 / lVar2
        Catch eErr As OverflowException
            MsgBox(txtErrorMsg.Text)
        Catch eErr As Exception
            MsgBox("有错误发生啦！" & vbCrLf & eErr.Source & vbCrLf & eerr.Message)
        End Try
    End Sub
End Class