进来看看呗

[dengNeeo]

我的网站里面有 到百度去 网址是 http://www.baidu.com 但是如果不能连接外网的时候 我想弹出 没有外网访问权限
该怎么做呢

[bleach001]

访问之前ping一下 ping 不通就不让访问

[dengNeeo]

能不能具体点呀

[haoyubin87]

ping命令使用方法

[haoyubin87]

       
Microsoft.VisualBasic.Devices.Computer com = new Microsoft.VisualBasic.Devices.Computer();            
bool result = com.Network.Ping(TextBox1.Text);            
Response.Write("ping " + TextBox1.Text + "结果:" + result.ToString());

[堆代码的爱因斯坦]

写个方法

 public bool Ping(string ip)
    {
        System.Net.NetworkInformation.Ping p = new System.Net.NetworkInformation.Ping();
        System.Net.NetworkInformation.PingOptions options = new System.Net.NetworkInformation.PingOptions();
        options.DontFragment = true;
        string data = "L";
        byte[] buffer = Encoding.ASCII.GetBytes(data);
        int timeout = 1000; // Timeout 时间，单位：毫秒
        System.Net.NetworkInformation.PingReply reply = p.Send(ip, timeout, buffer, options);
        if (reply.Status == System.Net.NetworkInformation.IPStatus.Success)
            return true;
        else
            return false;
    }

[子夜__]

public   static   bool   IsWebAccessible() 
                { 
                        HttpWebRequest   request; 
                        HttpWebResponse   response; 
                        string   Url   =   Config.Config.AppConfig[ "TestUrl "].ToString(); 
                        bool   bConnected   =   false; 
                        try 
                        { 
                                request   =   (HttpWebRequest)WebRequest.Create(Url); 
                                response   =   (HttpWebResponse)request.GetResponse(); 
                                if   (response.StatusCode   ==   HttpStatusCode.OK) 
                                { 
                                        bConnected   =   true; 
                                } 
                                response.Close(); 
                        } 
                        catch   (WebException   we) 
                        { 
                                bConnected   =   false; 
                                EventLog.Write(we); 
                                EventLog.Write(new   Exception( "无法连接到服务器： "   +Url)); 
                        } 
                        catch   (Exception   ex) 
                        { 
                                bConnected   =   false; 
                                EventLog.Write(ex); 
                        } 
                        finally 
                        { 
                                request   =   null; 
                                response   =   null; 
                        } 
                        return   bConnected; 
                }

false你就弹。。