如何通过代理服务器将WinForm连接到Internet

通过代理服务器连接到Web服务
http://www.codeproject.com/KB/webservices/web_service_by_proxy.aspx

示例代码:

' Search button: do a search, display number of results 
Private Sub btnSearch_Click(ByVal sender As System.Object, _
  ByVal e As System.EventArgs) Handles btnSearch.Click 

' Create a Google Search object 
Dim s As New Google.GoogleSearchService 

Try 

' google params 
Dim strLicenceseKey As String = "google license key" ' google license key 
Dim strSearchTerm As String = "Bruno Capuano" ' google license key 

' proxy settings 
Dim cr As New System.Net.NetworkCredential("user", "pwd", "MyDomain") 
Dim pr As New System.Net.WebProxy("127.0.1.2", 80) 

pr.Credentials = cr 
s.Proxy = pr 

' google search
Dim r As Google.GoogleSearchResult = s.doGoogleSearch(strLicenceseKey, _
  strSearchTerm, 0, 10, True, "", False, "", "", "")
' Extract the estimated number of results for the search and display it
Dim estResults As Integer = r.estimatedTotalResultsCount 

MsgBox(CStr(estResults))

Catch ex As System.Web.Services.Protocols.SoapException

MsgBox(ex.Message)

End Try

End Sub