主题：如何判断HttpClient是否有数据返回？而不至于报错

换一种方式

try
    Dim req = System.Net.WebRequest.Create("http://foxupdate.mbldt.com/MHClientUpdate/update123.txt")
    Dim pos = req.GetResponse
    Dim stm As System.IO.Stream = pos.GetResponseStream()
    Dim reader As New System.IO.StreamReader(stm)
    Dim str As String = reader.ReadToEnd
    pos.Close
    stm.Close
    reader.close
   
    msgbox(str)
catch ex As exception
    msgbox("出错")
    msgbox(ex.message)
End try