如何确定字符串在C#中是否为有效的IPv4或IPv6地址?

 IPAddress.TryParse

然后检查 AddressFamily

    string input = "your IP address goes here";

    IPAddress address;
    if (IPAddress.TryParse(input, out address))
    {
        switch (address.AddressFamily)
        {
            case System.Net.Sockets.AddressFamily.InterNetwork:
                // we have IPv4
                break;
            case System.Net.Sockets.AddressFamily.InterNetworkV6:
                // we have IPv6
                break;
            default:
                // umm... yeah... I'm going to need to take your red packet and...
                break;
        }
    }

只是一个关于使用的警告 System.Net.IpAddress.TryParse() :

如果向其传递一个包含整数(例如“3”)的字符串,则TryParse函数将其转换为“0.0.0.3”,从而转换为有效的InterNetworkV4地址。因此,至少应该将重新格式化的“0.0.0.3”返回给用户应用程序,以便用户知道如何解释其输入。

string myIpString = "192.168.2.1";
System.Net.IPAddress ipAddress = null;

bool isValidIp = System.Net.IPAddress.TryParse(myIpString, out ipAddress);

如果 isValidIp ipAddress.AddressFamily 以确定它是IPv4还是IPv6。它是 AddressFamily.InterNetwork 对于IPv4和 AddressFamily.InterNetworkV6 对于IPv6。

你可以退房 System.Uri.CheckHostName( value ) Unknown , Dns , IPv4 , IPv6 .

if( Uri.CheckHostName( value ) != UriHostNameType.Unknown)
    //then 'value' is a valid IP address or hostname

. : 对于IPv6。

        if (input.Contains(".") || input.Contains(":"))
        {
            IPAddress address;
            if (IPAddress.TryParse(input, out address))
            {
                switch (address.AddressFamily)
                {
                    case AddressFamily.InterNetwork:
                        return Ip4Address;
                    case AddressFamily.InterNetworkV6:
                        return Ip6Address;
                }
            }
        }

        IPAddress someIP;

        if (someIP.GetAddressBytes().Length == 4)
        {
            // IPV4
        }
        else (someIP.GetAddressBytes().Length == 16)
        {
            // IPV6
        }
        else
        {
            // Unknown
        }

我想应该有用

应用于字符串或IP地址的测试组合对我很有用。。

        /// <summary>
    /// Test string for valid ip address format
    /// </summary>
    /// 
    /// <param name="Address">The ip address string</param>
    /// 
    /// <returns>Returns true if address is a valid format</returns>
    public static bool IsValidIP(IPAddress Ip)
    {
        byte[] addBytes = Ip.GetAddressBytes();

        switch (Ip.AddressFamily)
        {
            case AddressFamily.InterNetwork:
                if (addBytes.Length == 4)
                    return true;
                break;
            case AddressFamily.InterNetworkV6:
                if (addBytes.Length == 16)
                    return true;
                break;
            default:
                break;
        }

        return false;
    }

    /// <summary>
    /// Test string for valid ip address format
    /// </summary>
    /// 
    /// <param name="Address">The ip address string</param>
    /// 
    /// <returns>Returns true if address is a valid format</returns>
    public static bool IsValidIP(string Address)
    {
        IPAddress ip;
        if (IPAddress.TryParse(Address, out ip))
        {
            switch (ip.AddressFamily)
            {
                case System.Net.Sockets.AddressFamily.InterNetwork:
                    if (Address.Length > 6 && Address.Contains("."))
                    {
                        string[] s = Address.Split('.');
                        if (s.Length == 4 && s[0].Length > 0 &&  s[1].Length > 0 &&  s[2].Length > 0 &&  s[3].Length > 0)
                            return true;
                    }
                    break;
                case System.Net.Sockets.AddressFamily.InterNetworkV6:
                    if (Address.Contains(":") && Address.Length > 15)
                        return true;
                    break;
                default:
                    break;
            }
        }

        return false;
    }