C# 实现 IP 地址有效性验证

using System.Net;
using System.Text.RegularExpressions;
public class IpValidator
{
    // IPv4 正则表达式
    private const string Ipv4Pattern = @"^((25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(25[0-5]|2[0-4]\d|[01]?\d\d?)$";
    // 验证IP地址是否有效
    public static bool IsValidIp(string ip)
    {
        if (string.IsNullOrEmpty(ip)) return false;
        // 方式1：使用IPAddress类验证
        if (IPAddress.TryParse(ip, out _))
        {
            return true;
        }
        return false;
    }
    // 验证是否为有效的IPv4地址
    public static bool IsValidIpv4(string ip)
    {
        if (string.IsNullOrEmpty(ip)) return false;
        return Regex.IsMatch(ip, Ipv4Pattern, RegexOptions.Compiled);
    }
    // 调用示例
    public static void TestIpValidation()
    {
        string[] testIps = { "192.168.1.1", "256.0.0.1", "::1", "abc" };
        foreach (var ip in testIps)
        {
            Console.WriteLine($"IP: {ip} | 有效: {IsValidIp(ip)} | IPv4: {IsValidIpv4(ip)}");
        }
    }
}