UrlEncode eq php and java

main.cs

using System;
using System.Net;
using System.Text;
public class Program
{
    public static void Main()
    {

        Console.WriteLine(PhpLikeUrlHelper.UrlEncode("Hello World! 你好 #$&\'()*+,-./:;=?@[]!\'", Encoding.UTF8));
    }
}

public static class PhpLikeUrlHelper
{


    public static string UrlEncode(string value, Encoding encoding)
    {
        if (string.IsNullOrEmpty(value))
            return value;

        StringBuilder encodedString = new StringBuilder();

        foreach (char c in value)
        {
            if (c == ' ')
            {
                encodedString.Append('+'); // PHP/Java 将空格编码为 +
            }
            else if (IsSafe(c))
            {
                encodedString.Append(c);
            }
            else
            {
                // 对非 ASCII 字符进行 UTF-8 编码处理
                byte[] bytes = encoding.GetBytes(c.ToString());
                foreach (byte b in bytes)
                {
                    encodedString.Append('%');
                    encodedString.Append(b.ToString("X2")); // 转换为十六进制
                }
            }
        }

        return encodedString.ToString();
    }

    private static bool IsSafe(char c)
    {
        // 允许的安全字符
        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9')
               || c == '-' || c == '_' || c == '.' || c == '~'; // 添加其他安全字符
    }
}