public Task <bool> IsReachable(string host, TimeSpan timeout)
{
return(Task <bool> .Run(() =>
{
if (!DeviceNetworkInformation.IsNetworkAvailable)
{
return false;
}
AutoResetEvent e = new AutoResetEvent(false);
bool isReachable = false;
NameResolutionCallback d = delegate(NameResolutionResult result)
{
isReachable = result.NetworkErrorCode == NetworkError.Success;
e.Set();
};
DeviceNetworkInformation.ResolveHostNameAsync(new System.Net.DnsEndPoint(host, 0), d, this);
e.WaitOne(timeout);
return isReachable;
}));
}
/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// nameresolutioncallback.BeginInvoke(result, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this NameResolutionCallback nameresolutioncallback, NameResolutionResult result, AsyncCallback callback)
{
if (nameresolutioncallback == null)
{
throw new ArgumentNullException("nameresolutioncallback");
}
return(nameresolutioncallback.BeginInvoke(result, callback, null));
}
