GetHostEntry-如何处理找不到主机

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问题描述

是否可以处理在GetHostEntry查找中找不到的主机?

Is there a way to handle host not found on a GetHostEntry lookup?

例如我的下面代码将返回计算机的IP，除非未找到主机名，否则它将崩溃.

Ex. My code below will return the IP of a machine, unless the hostname is not found, it then crashes.

DIM sysMachineName，sysIPAddress AS字符串

DIM sysMachineName, sysIPAddress AS String

sysMachineName = Me.txtbx_Text1.Text

sysIPAddress = System.Net.DNS.GetHostEntry(sysMachineName).Addresslist(0).ToString()

Me.Text =系统信息:" + sysMachineName +" -" & sysIPAddress

Me.Text = "System Info For: " + sysMachineName + " - " & sysIPAddress

推荐答案

        Dim testnms() As String = {"", "foo.bar", "social.microsoft.com", "google.com"}
        For Each nm As String In testnms
            Try
                Dim iphe As Net.IPHostEntry = Net.Dns.GetHostEntry(nm)
                Debug.WriteLine(iphe.AddressList(0))
            Catch sex As Net.Sockets.SocketException
                Stop 'hostname not found
            Catch ex As Exception
                Stop 'other exceptions. see https://msdn.microsoft.com/en-us/library/ms143998(v=vs.110).aspx
            End Try
        Next

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