从主机名创建IPEndPoint

Question

我正在使用需要“IPEndPoint”的第三方dll。由于用户可以输入IP地址或主机名，因此我需要先将主机名转换为IP地址，然后才能创建IPEndPoint。是否有任何功能在.net中执行此操作，或者我将不得不编写自己的DNS查找代码？

Answer 1

System.Net.Dns.GetHostAddresses

public static IPEndPoint GetIPEndPointFromHostName(string hostName, int port, bool throwIfMoreThanOneIP)
{
    var addresses = System.Net.Dns.GetHostAddresses(hostName);
    if (addresses.Length == 0)
    {
        throw new ArgumentException(
            "Unable to retrieve address from specified host name.", 
            "hostName"
        );
    }
    else if (throwIfMoreThanOneIP && addresses.Length > 1)
    {
        throw new ArgumentException(
            "There is more that one IP address to the specified host.", 
            "hostName"
        );
    }
    return new IPEndPoint(addresses[0], port); // Port gets validated here.
}

Answer 2

您可以使用以下内容：

var addresses = Dns.GetHostAddresses(uri);
Debug.Assert(addresses.Length > 0);
var endPoint = new IPEndPoint(addresses[0], port);