在
MSDN,它提到GetHostByName已过时.替换是GetHostEntry.它们有什么区别？
解决方法
看起来像GetHostEntry做了更多的错误检查,也支持
Network Tracing
GetHostByName已解压缩：
public static IPHostEntry GetHostByName(string hostName)
{
if (hostName == null)
throw new ArgumentNullException("hostName");
Dns.s_DnsPermission.Demand();
IPAddress address;
if (IPAddress.TryParse(hostName,out address))
return Dns.GetUnresolveAnswer(address);
else
return Dns.InternalGetHostByName(hostName,false);
}
GetHostEntry已解压缩：
public static IPHostEntry GetHostEntry(string hostNameOrAddress)
{
if (Logging.On)
Logging.Enter(Logging.Sockets,"DNS","GetHostEntry",hostNameOrAddress);
Dns.s_DnsPermission.Demand();
if (hostNameOrAddress == null)
throw new ArgumentNullException("hostNameOrAddress");
IPAddress address;
IPHostEntry ipHostEntry;
if (IPAddress.TryParse(hostNameOrAddress,out address))
{
if (((object) address).Equals((object) IPAddress.Any) || ((object) address).Equals((object) IPAddress.IPv6Any))
throw new ArgumentException(SR.GetString("net_invalid_ip_addr"),"hostNameOrAddress");
ipHostEntry = Dns.InternalGetHostByAddress(address,true);
}
else
ipHostEntry = Dns.InternalGetHostByName(hostNameOrAddress,true);
if (Logging.On)
Logging.Exit(Logging.Sockets,(object) ipHostEntry);
return ipHostEntry;
}