检查网络可用性vb.net

尝试 NetworkInterface.GetIsNetworkAvailable :

指示是否有可用的网络连接。

如果任何网络接口标记为“up”,并且不是环回或隧道接口,则认为网络连接可用。

要查看是否有可用的网络,可以使用vb.net my命名空间:

My.Computer.Network.IsAvailable

我想这是对 NetworkInterface 安德鲁答案中的属性。要查看是否可以使用可用网络访问特定服务器,可以使用

My.Computer.Network.Ping(host name or IP address, or a System.Uri)

我喜欢挖旧线!我的解决方案是用DNS进行测试。通过这种方式,您可以测试xxx网络中的特定名称,以判断您是否在内部/外部。嵌套的try语句显示了这个概念。

Imports System.Net

Module Networker

Dim Online_Status As Boolean = vbFalse
Dim InsideJoeNetwork As Boolean = vbFalse
Dim CurrentJoeIPAddress As New IPHostEntry



Public ReadOnly Property GetOnlineStatus() As String
    Get
        Return Online_Status
    End Get

End Property



Public ReadOnly Property InsideJoeNet() As String
    Get
        Return InsideJoeNetwork
    End Get

End Property



Sub Initialize()
    Set_Online_Status()

End Sub



Public Sub Set_Online_Status()

    If My.Computer.Network.IsAvailable Then
        Try
            Dim DNSTest As IPHostEntry = Dns.GetHostEntry("google.com")
            If DNSTest.AddressList.Length > 0 Then
                Online_Status = True
                Detect_Joe_Network()
            Else : Online_Status = False

            End If

        Catch ex As System.Net.Sockets.SocketException

            Online_Status = False

        End Try
    End If

End Sub



Public Sub Detect_Joe_Network()

    If Online_Status = True Then

        Dim JoeIP As IPHostEntry = New IPHostEntry()

        Try
            JoeIP = Dns.GetHostEntry("laptop")
            If JoeIP.AddressList.Length > 0 Then

                InsideJoeNetwork = True
                CurrentJoeIPAddress = JoeIP
                'MessageBox.Show(JoeIP.HostName.ToString(), "JoeIP", MessageBoxButtons.OK, MessageBoxIcon.Information)
            End If
        Catch ex As Sockets.SocketException

            Try
                JoeIP = Dns.GetHostEntry("laptop.exampledomain.com")
                If JoeIP.AddressList.Length > 0 Then

                    InsideJoeNetwork = False
                    CurrentJoeIPAddress = JoeIP
                    ' MessageBox.Show(JoeIP.HostName.ToString(), "JoeIP", MessageBoxButtons.OK, MessageBoxIcon.Information)
                End If
            Catch ey As Sockets.SocketException

            End Try
        End Try
    End If

End Sub

End Module