vb.net - 如果没有可读取的内容，StreamReader 将挂起

Question

我有这个代码来读取 TCP 流：

  Function checkdata() As String
    Dim Stream As NetworkStream = client.GetStream()
    sr = New StreamReader(Stream)

    Dim s As String = sr.ReadLine() <------------
    Return s
  End Function

问题是如果流上没有新数据，代码会挂在标记的行上。为什么？我该如何解决？

Answer 1

您可以使用NetworkStream 的.DataAvailable 属性吗？

Function checkdata() As String
    Dim Stream As NetworkStream = client.GetStream()
    If Stream.DataAvailable Then
        Dim SR = New StreamReader(Stream)
        Dim s As String = SR.ReadLine()
        Return s
    Else
        Return Nothing
    End If
End Function