vb.net制作登录框,vb登录对话框

请用vb.net写一个模拟的登录界面

解决方案资源管理器中右键菜单,添加,WINDOWS窗体,弹出的对话框中,左栏已安装的模板中选择WINDOWS FORMS ,右边中找到 登录窗体。添加 。程序会添加一个登录界面。很方便。你试下。

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如何用VB.NET制作账号自动登陆的程序

Private Sub SendBlogTimer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SendBlogTimer.Tick

Dim textboxUserId As HtmlElement

Dim textboxPassword As HtmlElement

Dim buttonSubmit As HtmlElement

textboxUserId = SendBlogBrowser.Document.All("username")'获取用户名输入框

textboxPassword = SendBlogBrowser.Document.All("password")'获取密码输入框

buttonSubmit = SendBlogBrowser.Document.All("btnLogin")'获取登陆按钮

textboxUserId.SetAttribute("value","用户名")'给用户名输入框赋值

textboxPassword.SetAttribute("value","密码")'给密码框赋值

buttonSubmit.InvokeMember("click")’执行登陆按钮的单击

End Sub

其中的SendBlogBrowser为WebBrowser控件

如何用VB.net连接数据库做一个简单的登陆窗口?

Label1.Caption = "融通系统外挂程序"

If Dir(App.Path "/hjw.mdb") "" Then

Set mydata = OpenDatabase(App.Path "\hjw")

Set myrs1 = mydata.OpenRecordset("user", dbOpenTable)

Else

Set mydata = CreateDatabase(App.Path "\hjw", dbLangGeneral, dbVersion40)

mydata.Execute "create table ku (建立日期 text(100),库名 text(100),功能 text(100))"

mydata.Execute "create table system (店号 integer,建立日期 text(100),文件路径 text(100),软件版本 text(100),路径1 text(50),路径2 text(50),路径3 text(50),路径4 text(50))"

kuname = "system"

kugn = "文件信息"

Me.showlist1

mydata.Execute "create table user (user text(50),passwd text(50),name text(50),quanx integer)"

kuname = "user"

kugn = "用户信息"

Me.showlist1

Private Sub cmdOK_Click()

txtUserName.SetFocus

If Trim(txtUserName.Text = "") Then

MsgBox "没有这个用户,请重新输入用户名!", vbOKOnly + vbExclamation, "警告"

txtUserName.SetFocus

Else

sql = "select * from user where user = '" txtUserName.Text "'"

'Debug.Print sql

'Set mrc = ExecuteSQL(sql, MsgText)

Set myrs2 = mydata.OpenRecordset(sql)

If myrs2.EOF = True Then

MsgBox "没有这个用户,请重新输入用户名!", vbOKOnly + vbExclamation, "警告"

txtUserName.SetFocus

Else

If Trim(myrs2.Fields(1)) = Trim(txtPassword.Text) Then

UserName = myrs2.Fields(2)

myrs2.Close

Me.Hide

' UserName = Trim(txtUserName.Text)

'Debug.Print UserName

MDIform1.Show

Else

MsgBox "输入密码不正确,请重新输入!", vbOKOnly + vbExclamation, "警告"

txtPassword.SetFocus

txtPassword.Text = ""

End If

End If

End If

End Sub

用vb.net ,后台用access 做一个登录窗口

建个模块, Dim varcnn As OleDb.OleDbConnection ReadOnly Property cnn() As OleDb.OleDbConnection

Get

If varcnn Is Nothing OrElse varcnn.State ConnectionState.Open Then Dim cnstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=""" My.Application.Info.DirectoryPath "\Contact.mdb"";Persist Security Info=True"

varcnn = New OleDbConnection(cnstr)

varcnn.Open()

End If

Return varcnn

End Get

登录窗体,新建一个就行了。代码Public Class LoginForm1

Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click

Using cmd As New OleDb.OleDbCommand("select password from tbuser where userid =?", cnn)

cmd.Parameters.Add("?", OleDbType.VarChar).Value = Me.UsernameTextBox.Text

Dim obj As Object = cmd.ExecuteScalar

If (Not IsDBNull(obj)) AndAlso (obj IsNot Nothing) AndAlso obj = PasswordTextBox.Text Then

Me.DialogResult = Windows.Forms.DialogResult.OK

Else MessageBox.Show("密码不正确!") Return

End If

End Using Me.Close()

End Sub Private Sub Cancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Cancel.Click

Me.DialogResult = Windows.Forms.DialogResult.Cancel

Me.Close()

End SubEnd Class 项目属性里点查看应用程序事件,写代码Namespace My ' 以下事件可用于 MyApplication:

'

' Startup: 应用程序启动时在创建启动窗体之前引发。

' Shutdown: 在关闭所有应用程序窗体后引发。如果应用程序异常终止,则不会引发此事件。

' UnhandledException: 在应用程序遇到未处理的异常时引发。

' StartupNextInstance: 在启动单实例应用程序且应用程序已处于活动状态时引发。

' NetworkAvailabilityChanged: 在连接或断开网络连接时引发。

Partial Friend Class MyApplication

Private Sub MyApplication_Startup(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.StartupEventArgs) Handles Me.Startup

Dim f As New LoginForm1

If Not f.ShowDialog = DialogResult.OK Then

End

End If

End Sub End ClassEnd Namespace

你测试一下吧。


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