HTML对DGV细胞的响应

Question

在我的应用中，我在我的网站上为用户验证了几个HTTP Web请求。每个请求都会分解并发送到带有3列=用户，通过和响应的DataGridView表。根据响应的不同

我的问题是我如何同时提出几个HTTP请求，例如20并记录每个DGV并监视响应，以防万一我需要将代理交换并再次运行。

。

这是我发布和获取响应的方式。

Function Post(ByVal Data As String, ByVal Proxy As String)
    Dim responseData As String = ""
    Dim Site As String = "example.com"
    Dim request As Net.HttpWebRequest = Net.WebRequest.Create(Site)
    Dim tempCookies As New CookieContainer
    Dim encoding As New ASCIIEncoding()
    Dim byteData As Byte() = encoding.GetBytes(Data)
    Try
        request.UserAgent = "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.2 Safari/537.36"
        request.Accept = "*/*"
        request.CookieContainer = tempCookies
        request.ContentLength = byteData.Length
        request.AllowAutoRedirect = True
        request.KeepAlive = True
        request.Timeout = 60000
        request.Method = "POST"
        If request.Method = "POST" Then
            request.ContentType = "application/x-www-form-urlencoded"
            Dim postByteArray() As Byte = encoding.GetBytes(Data)
            request.ContentLength = postByteArray.Length
            Dim postStream As IO.Stream = request.GetRequestStream()
            postStream.Write(postByteArray, 0, postByteArray.Length)
            postStream.Close()
        End If
        Dim response As Net.HttpWebResponse = request.GetResponse()
        If response.StatusCode = Net.HttpStatusCode.OK Then
            Dim responseStream As IO.StreamReader = _
              New IO.StreamReader(response.GetResponseStream())
            responseData = responseStream.ReadToEnd()
        End If
        response.Close()
    Catch e As Exception
        responseData = "An error occurred: " & e.Message
    End Try
    Post = responseData
End Function
 Dim comboResp As String = (Post("Username=" & User + "&Password=" & Pass & "&submitLogin=Log+In&ReturnUrl=", rndProxy))
    Dim row As String() = New String() {User, Pass, comboResp}
    DataGridView1.Rows.Add(row)

我似乎无法在单元格中显示出响应，然后根据每一行的响应不知道如何调用子。

最接近我之后的示例。

Answer 1

让我们假设您是从一个按钮开始的。单击事件处理程序：

Imports System.IO
Imports System.Net
Imports System.Text
Const COR_E_INVALIDOPERATION As Long = &H80131509
'A class used to contain all requests data
Private _AuthenticationObject As AuthObject
'A List of UserIds as Passwords KeyValue pairs
Private _CredentialsList As New Dictionary(Of String, String)
Private Async Sub btnTestLogin_Click(sender As Object, e As EventArgs) Handles btnTestLogin.Click
    btnTestLogin.Enabled = False
    'Fill a list of credentials (the use of a Dictionary is just one possible method)
    _CredentialsList.Add("Username1", "Password1")
    _CredentialsList.Add("Username2", "Password2")
    _CredentialsList.Add("Username3", "Password3")
    _AuthenticationObject = New AuthObject
    _AuthenticationObject.URL = "http://somesite.com"
    _AuthenticationObject.ProxyParameters.Host = "somehostaddress"
    _AuthenticationObject.ProxyParameters.Port = 8080
    'Or simple proxy URI
    '_AuthenticationObject.ProxyParameters.Uri = New Uri("http://someproxyhost")
    _AuthenticationObject.ProxyParameters.BypassLocal = False
    _AuthenticationObject.ProxyParameters.Credentials = New String() {"proxyuserid", "proxypassword"}
    'If you don't want to use an Async starter, use this
    'And of course => For Each _item In _result.Result
    'Dim _result As Task(Of List(Of String())) = Task.Run(Function() CheckAuthentication(_AuthenticationObject, True))
    'Task.WaitAny(_result)
    Dim _result As List(Of String()) = Await CheckAuthentication(_AuthenticationObject, False)
    For Each _item In _result
        DataGridView1.Rows.Add(_item)
    Next
    btnTestLogin.Enabled = True
End Sub

这是用于协调顺序请求的网关函数：

Public Async Function CheckAuthentication(ByVal _AuthenticationObject As AuthObject, ByVal _useproxy As Boolean) As Task(Of List(Of String()))
    Dim _authresult As List(Of String()) = New List(Of String())
    _AuthenticationObject.UseProxy = _useproxy
    For Each _item In _CredentialsList
        _AuthenticationObject.LogInData = "Username=" & _item.Key & "&Password=" & _item.Value & "&submitLogin=Log+In&ReturnUrl="
        'This an Async version of you original function, plus some editing
        '_AuthenticationObject = Await PostAsync(_AuthenticationObject)
        'Test it first using a delay
        Await Task.Delay(1000)
        _authresult.Add(New String() {_item.Key,
                                      _item.Value,
                                      If(_AuthenticationObject.StatusCode = HttpStatusCode.OK, "OK", "Failed"),
                                      If(_AuthenticationObject.UseProxy = True, "Proxy", "No Proxy")})
    Next
    Return _authresult
End Function

这是您的原始功能，用于支持更复杂的身份验证对象

Private Async Function PostAsync(ByVal _PostData As AuthObject) As Task(Of AuthObject)
    Dim httpRequest As HttpWebRequest
    Dim _StatusCode As HttpStatusCode
    Dim _Payload As String = String.Empty
    Dim _postparameters As Byte() = Encoding.UTF8.GetBytes(_PostData.LogInData)
    Try
        httpRequest = WebRequest.CreateHttp(_PostData.URL)
        httpRequest.Timeout = 10000
        httpRequest.AllowAutoRedirect = False
        httpRequest.ServicePoint.Expect100Continue = False
        httpRequest.AutomaticDecompression = DecompressionMethods.GZip Or DecompressionMethods.Deflate
        httpRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0"
        httpRequest.Accept = "ext/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
        httpRequest.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate;q=0.8")
        httpRequest.Method = WebRequestMethods.Http.Post
        httpRequest.ContentType = "application/x-www-form-urlencoded"
        httpRequest.ContentLength = _postparameters.Length
        If _PostData.UseProxy Then
            If Not IsNothing(_PostData.ProxyParameters) Then
                If (_PostData.ProxyParameters.Host.Length > 0) Then
                    httpRequest.Proxy = New WebProxy(_PostData.ProxyParameters.Host, _PostData.ProxyParameters.Port)
                Else
                    httpRequest.Proxy = New WebProxy(_PostData.ProxyParameters.Uri, _PostData.ProxyParameters.BypassLocal)
                End If
                httpRequest.Proxy.Credentials = New NetworkCredential(_PostData.ProxyParameters.Credentials(0), _
                                                                                        _PostData.ProxyParameters.Credentials(1))
            Else
                httpRequest.Proxy = WebRequest.GetSystemWebProxy()
            End If
        End If
        Using _stream As Stream = Await httpRequest.GetRequestStreamAsync()
            _stream.Write(_postparameters, 0, _postparameters.Length)
        End Using
        Using httpResponse As HttpWebResponse = CType(Await httpRequest.GetResponseAsync(), HttpWebResponse)
            Dim _encoding As System.Text.Encoding
            _encoding = If(httpResponse.CharacterSet.Length > 0, 
                           Encoding.GetEncoding(httpResponse.CharacterSet), 
                           Encoding.GetEncoding("utf-8"))
            Using _stream As Stream = httpResponse.GetResponseStream()
                _stream.Position = 0
                Using _reader As StreamReader = New StreamReader(_stream, _encoding)
                    _Payload = _reader.ReadToEnd().Trim()
                End Using
            End Using
            _StatusCode = httpResponse.StatusCode
        End Using
    Catch exW As WebException
        If Not IsNothing(exW.Response) Then
            _StatusCode = CType(exW.Response, HttpWebResponse).StatusCode
        End If
        _Payload = String.Empty
    Catch exS As System.Exception
        _StatusCode = If(exS.HResult = COR_E_INVALIDOPERATION,
                         CType(WebExceptionStatus.ConnectFailure, HttpStatusCode),
                         CType(WebExceptionStatus.RequestCanceled, HttpStatusCode))
        _Payload = String.Empty
    End Try
    _PostData.StatusCode = _StatusCode
    _PostData.PayLoad = _Payload
    Return _PostData
End Function

这些是使用的类对象：

Public Class AuthObject
    Private _URL As String = String.Empty
    Private _LogInData As String = String.Empty
    Private _UseProxy As Boolean = False
    Private _ProxyParameters As ProxyParameters
    Private _PayLoad As String = String.Empty
    Private _StatusCode As HttpStatusCode
    Public Sub New()
        Me._ProxyParameters = New ProxyParameters
    End Sub
    Public Property URL() As String
        Get
            Return Me._URL
        End Get
        Set(ByVal value As String)
            Me._URL = value
        End Set
    End Property
    Public Property LogInData() As String
        Get
            Return Me._LogInData
        End Get
        Set(ByVal value As String)
            Me._LogInData = value
        End Set
    End Property
    Public Property UseProxy() As Boolean
        Get
            Return Me._UseProxy
        End Get
        Set(ByVal value As Boolean)
            Me._UseProxy = value
        End Set
    End Property
    Public Property ProxyParameters() As ProxyParameters
        Get
            Return Me._ProxyParameters
        End Get
        Set(ByVal value As ProxyParameters)
            Me._ProxyParameters = value
        End Set
    End Property
    Public Property PayLoad() As String
        Get
            Return Me._PayLoad
        End Get
        Set(ByVal value As String)
            Me._PayLoad = value
        End Set
    End Property
    Public Property StatusCode() As HttpStatusCode
        Get
            Return Me._StatusCode
        End Get
        Set(ByVal value As HttpStatusCode)
            Me._StatusCode = value
        End Set
    End Property
End Class
Public Class ProxyParameters
    Private _Uri As Uri
    Private _Host As String
    Private _Port As Integer
    Private _Credentials As String()
    Private _BypassLocal As Boolean
    Public Sub New()
    End Sub
    Public Property Uri() As Uri
        Get
            Return Me._Uri
        End Get
        Set(ByVal value As Uri)
            Me._Uri = value
        End Set
    End Property
    Public Property Host() As String
        Get
            Return Me._Host
        End Get
        Set(ByVal value As String)
            Me._Host = value
        End Set
    End Property
    Public Property Port() As Integer
        Get
            Return Me._Port
        End Get
        Set(ByVal value As Integer)
            Me._Port = value
        End Set
    End Property
    Public Property Credentials() As String()
        Get
            Return Me._Credentials
        End Get
        Set(ByVal value As String())
            Me._Credentials = value
        End Set
    End Property
    Public Property BypassLocal() As Boolean
        Get
            Return Me._BypassLocal
        End Get
        Set(ByVal value As Boolean)
            Me._BypassLocal = value
        End Set
    End Property
End Class