public async Task <DnsDetail> GetDnsDetailAsync(string hostName)
{
DnsDetail dnsDetail = null;
try
{
WebRequest request = WebRequest.Create(string.Format("https://{0}", hostName));
HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync();
if (response != null && response.StatusCode.Equals(HttpStatusCode.OK))
{
string serverName = response.GetResponseHeader(AppConstant.SERVER);
dnsDetail = new DnsDetail
{
Name = hostName,
WebServer = string.IsNullOrEmpty(serverName) ? string.Empty : serverName,
IPAddresses = await this.GetIpAddressesAsync(hostName)
};
}
}
catch
{
}
return(dnsDetail);
}
public async Task <List <DnsDetail> > GetDnsDetailsAsync(string[] dnsList)
{
List <DnsDetail> dnsDetails = new List <DnsDetail>();
var taskList = dnsList.Select(async hName =>
{
try
{
if (this.ValidateDns(hName))
{
hName = hName.Trim().ToLower();
var dnsDetailsCached = this.GetDnsDetailFromCache(hName);
if (dnsDetailsCached != null)
{
dnsDetails.Add(dnsDetailsCached);
}
else
{
DnsDetail dnsDetail = await this.webRequestHandler.GetDnsDetailAsync(hName);
if (dnsDetail != null)
{
dnsDetails.Add(dnsDetail);
}
}
}
}
finally
{
}
});
await Task.WhenAll(taskList);
return(dnsDetails);
}