Vb.Net修改WebBrowser控件UserAgent的方法 -

Imports System.Runtime.InteropServices
Imports System.Reflection
Public Class Form1
    Dim isUserAgentSet As Boolean = False
    <DllImport("urlmon.dll", CharSet:=CharSet.Ansi)> _
    Private Shared Function UrlMkSetSessionOption(ByVal dwOption As Integer, ByVal pBuffer As String, ByVal dwBufferLength As Integer, ByVal dwReserved As Integer) As Integer
    End Function
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
    Private Shared defaultUserAgent As String = Nothing

    Const URLMON_OPTION_USERAGENT As Integer = &H10000001
    ''' <summary>
    ''' 在默认的UserAgent后面加一部分
    ''' </summary>
    Public Shared Sub AppendUserAgent(ByVal Str As String)
        If String.IsNullOrEmpty(defaultUserAgent) Then
            defaultUserAgent = GetDefaultUserAgent()
        End If
        Dim ua As String = defaultUserAgent & Str
        ChangeUserAgent(ua)
    End Sub
    ''' <summary>
    ''' 修改UserAgent
    ''' </summary>
    Public Shared Sub ChangeUserAgent(ByVal userAgent As String)
        UrlMkSetSessionOption(URLMON_OPTION_USERAGENT, userAgent, userAgent.Length, 0)
    End Sub
    ''' <summary>
    ''' 一个很BT的获取IE默认UserAgent的方法
    ''' </summary>
    Private Shared Function GetDefaultUserAgent() As String
        Dim wb As New WebBrowser()
        wb.Navigate("about:blank")
        While wb.IsBusy
            Application.DoEvents()
        End While
        Dim window As Object = wb.Document.Window.DomWindow
        Dim wt As Type = window.[GetType]()
        Dim navigator As Object = wt.InvokeMember("navigator", BindingFlags.GetProperty, Nothing, window, New Object() {})
        Dim nt As Type = navigator.[GetType]()
        Dim userAgent As Object = nt.InvokeMember("userAgent", BindingFlags.GetProperty, Nothing, navigator, New Object() {})
        Return userAgent.ToString()
    End Function

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        AppendUserAgent("Tiancao.net")
        ' ChangeUserAgent("Tiancao.net")
        MsgBox(GetDefaultUserAgent)
        WebBrowser1.Refresh()
    End Sub
End Class

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