知识大全 ASP.NET 3.5中的Login控件应用vb.net实现

Posted 2022-07-17 知

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　　The ASP NET login controls provide a robust login solution for ASP NET Web applications without requiring programming By default login controls integrate with ASP NET membership and forms authentication to help automate user authentication for a Web site It provides you with a ready to use user interface that queries the user name and password from the user and offers a Log In button for login It validate user credentials against the membership API and encapsulating the basic froms authentication functionality like redirecting back to the original requested page in a restricted area of you application after the successful login

　　The Login control displays a user interface for user authentication The Login control contains text boxes for the user name and password and a check box that allows users to indicate whether they want the server to store their identity using ASP NET membership and automatically be authenticated the next time they visit the site

　　The Login control has properties for customized display for customized messages and for links to other pages where users can change their password or recover a fotten password The Login control can be used as a standalone control on a main or home page or you can use it on a dedicated login page If you use the Login control with ASP NET membership you do not need to write code to perform authentication However if you want to create your own authentication logic you can handle the Login control s Authenticate event and add custom authentication code

　　Note Login controls might not function correctly if the Method of the ASP NET Web page is changed from POST (the default) to GET

　　Start Microsoft Visual Studio

　　Create a new ASP NET WebSite using Visual Basic Like this:

Drag and drop Login control on page from ToolBox Figure Whenever user hits the Log In button the control automatically validates the user name and password using the membership API function Membership ValidateUse() and then calls FormAuthentication redirectFromLoginPage() if the validation was successful All options on the UI of the LoginControl affect the input delivered by the control to these methods For Example if you click the Remember me next time check box it passes the value true to the createPresistentCookie parameter of the RedirectFromLoginPage() method Therefore the FormAuthenticateModule creates a persistent cookie There are three Login Tasks by default Auto Format you can select default schemes Convert To Template You can edit content of Login Control Administer Website You can configure Web Site Administration Tools Like Security Application Provider

　　Figure

　　<div>

　　<asp:Login ID= Login runat= server BackColor= #F F DE BorderColor= #CCCC BorderStyle= Solid BorderWidth= px Font Names= Verdana Font Size= pt >

　　</asp:Login>

　　</div>

　　</form>

　　You can change styles of LoginControl using css too Like this:

　　 LoginControl

　　background color:#F F DE;

　　border color:#CCCC ;

　　border style:solid;

　　border width: px;

　　font family:Verdana;

　　font size: px;

　　And now apply css to control:

　　< xmlns= >

　　<title>Login Control</title>

　　</head>

　　<body>

　　<div>

　　<asp:Login ID= Login runat= server CssClass= LoginControl >

　　</asp:Login>

　　</div>

　　</form>

　　</body>

　　</>

　　If you running the page and if the CSS file is placed in a directory where anonymous access is denied the add the following configuration for the CSS file to you nfig file

　　</authorization>

　　</system web>

　　</location>

　　You can add several hyperlinks to your Login control such as hyperlink to a help text page or a hyperlink to to a registration page

　　<asp:Login ID= Login runat= server CssClass= LoginControl

　　CreateUserText= Register

　　CreateUserUrl= ~/Register aspx

　　HelpPageText= Additional Help HelpPageUrl= ~/Help aspx

　　InstructionText= Please enter your user name and password for login >

　　</asp:Login>

　　Looks like this :

　　Here is VB Code:

　　Imports System

　　Imports System Collections Generic

　　Imports System Linq

　　Imports System Web

　　Imports System Web UI

　　Imports System Web UI WebControls

　　Imports System Data SqlClient

　　Partial Class _Default

　　Inherits System Web UI Page

　　Protected Sub Page_Load(ByVal sender As Object ByVal e As System EventArgs) Handles Me Load

　　If Not Me IsPostBack Then

　　ViewState( LoginErrors ) =

　　End If

　　End Sub

　　Protected Sub Login _Authenticate(ByVal sender As Object ByVal e As AuthenticateEventArgs)

　　If YourValidationFunction(Login UserName Login Password) Then

　　 e Authenticated = true;

　　MessageLabel Text = Successfully Logged In

　　Else

　　e Authenticated = False

　　End If

　　End Sub

　　Protected Sub Login _LoginError(ByVal sender As Object ByVal e As EventArgs)

　　If ViewState( LoginErrors ) Is Nothing Then

　　ViewState( LoginErrors ) =

　　End If

　　Dim ErrorCount As Integer = CInt(ViewState( LoginErrors )) +

　　ViewState( LoginErrors ) = ErrorCount

　　If (ErrorCount > ) AndAlso (Login PasswordRecoveryUrl <> String Empty) Then

　　Response Redirect(Login PasswordRecoveryUrl)

　　End If

　　End Sub

　　Private Function YourValidationFunction(ByVal UserName As String ByVal Password As String) As Boolean

　　Dim boolReturnValue As Boolean = False

　　Dim strConnection As String = server= ;database=Vendor;uid=sa;pwd=wintellect;

　　Dim sqlConnection As New SqlConnection(strConnection)

　　Dim SQLQuery As String = SELECT UserName Password FROM Login

　　Dim mand As New SqlCommand(SQLQuery sqlConnection)

　　Dim Dr As SqlDataReader

　　sqlConnection Open()

　　Dr = mand ExecuteReader()

　　While Dr Read()

　　If (UserName = Dr( UserName ) ToString()) And (Password = Dr( Password ) ToString()) Then

　　boolReturnValue = True

　　End If

　　Dr Close()

　　Return boolReturnValue

　　End While

　　Return boolReturnValue

　　End Function

　　End Class

　　If you insert wrong username and password then message will show like this:

　　If you insert correct usename password then redirect your page whereever you want

　　or you can show message in ErrorLabel like this:

　　I am attaching my database with application in App_Data folder if u want to use my database then attach my MDF file

　　Any question and queries ask me any time

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