.net实现ping的实例代码

class ServicePinger
{
private static readonly ILog log = LogManager.GetLogger(typeof(ServicePinger));
public ServicePinger(string siteName, string siteUrl, string serviceUrl)
{
if (siteName == null)
throw new ArgumentException("siteName can't be null");

if (siteUrl == null)
throw new ArgumentException("siteUrl can't be null");

if (serviceUrl == null)
throw new ArgumentException("serviceUrl can't be null");

if (siteName.Length == 0)
throw new ArgumentException("siteName can't be empty");

if (siteUrl.Length == 0)
throw new ArgumentException("siteUrl can't be empty");

if (serviceUrl.Length == 0)
throw new ArgumentException("serviceUrl can't be empty");

pingingSiteName = siteName;
pingingSiteUrl = siteUrl;
serviceUrlToPing = serviceUrl;

}

private string pingingSiteName = string.Empty;
private string pingingSiteUrl = string.Empty;
private string serviceUrlToPing = string.Empty;
private int timeoutInMilliseconds = 3000;

/// <summary>
/// Does the actual pinging of the service
/// </summary>
public void Ping()
{
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serviceUrlToPing);
request.Method = "POST";
request.ContentType = "text/xml";
request.Timeout = timeoutInMilliseconds;
request.Credentials = CredentialCache.DefaultNetworkCredentials;

Stream stream = (Stream)request.GetRequestStream();
using (XmlTextWriter writer = new XmlTextWriter(stream, Encoding.ASCII))
{
writer.WriteStartDocument();
writer.WriteStartElement("methodCall");
writer.WriteElementString("methodName", "weblogUpdates.ping");
writer.WriteStartElement("params");
writer.WriteStartElement("param");
writer.WriteElementString("value", pingingSiteName);
writer.WriteEndElement();
writer.WriteStartElement("param");
writer.WriteElementString("value", pingingSiteUrl);
writer.WriteEndElement();
writer.WriteEndElement();
writer.WriteEndElement();
}

request.GetResponse();
}
catch (InvalidOperationException ex)
{
log.Error(ex);
}
catch (NotSupportedException ex)
{
log.Error(ex);
}

}

}