Public Class Form1
Private Const _UserNameC As String = "Tanker.Z" '常量声明 用 Const Private Const _UserPasswordC As String = "Jereh" Private Const _StringEmptyC As String = ""
Dim nValue As Integer '声明变量方式 ''' <summary> ''' ByVal 传值 ByRef 传引用 ''' Sub 是过程 无返回值 Function 是 函数 必须有返回值 ''' VB.NET不用;符号来做结束String.Empty ''' And 表示 与关系 Or表示 或关系 ''' </summary> ''' <param name="sender"></param> ''' <param name="e"></param> ''' <remarks></remarks>
Private Sub btnLogin_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles btnLogin.Click If txtUserName.Text.Trim() = String.Empty Or txtUserPassword.Text.Trim() = _StringEmptyC Then nValue = StrComp("A","B") 'StrComp()函数 若 A>B则返回1,若想等则返回0 若 A<B则返回 -1 所有返回值均为整数 MsgBox(nValue) Else If CheckLogin(txtUserName.Text,txtUserPassword.Text) Then Debug.Print("哦...........") Console.WriteLine("う..........Hello Friend") '那怎么才能看到打印的Hello Friend。 '这里需要在visual studio2010: Debug--》windows--》Output 。 Else MsgBox("い.....") End If End If End Sub
''' <summary> ''' ''' </summary> ''' <param name="userName"></param> ''' <param name="userPwd"></param> ''' <returns></returns> ''' <remarks></remarks> Private Function CheckLogin(ByVal userName As String,ByVal userPwd As String) As Boolean If StrComp(_UserNameC,userName) = 0 And StrComp(_UserPasswordC,userPwd) = 0 Then Return True End If Return False End Function
End Class (编辑:李大同)
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