url parser

CSharp · Console

/Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine(RemoveEmptyUrlParameters("one=aa&two=&three=aaa&four="));
	}
	
	public static string RemoveEmptyUrlParameters(string input)
    {
		var results = HttpUtility.ParseQueryString(input);
		
		Dictionary<string, string> nonEmpty = new Dictionary<string, string>();
		foreach(var k in results.AllKeys)
		{
			if(!string.IsNullOrWhiteSpace(results[k]))
			{
				nonEmpty.Add(k, results[k]);
			}
		}

        return string.Join("&", nonEmpty.Select(kvp => $"{kvp.Key}={kvp.Value}"));
    }
}