c# request.querystring add and remove few key value pairs in an efficient manner?

Question

We want to remove query string (a,b,c,d) and add query string (z). For example:

Input: /example.com/?a=1&b=2&c=3&d=4&e=5&f=6
Output: /example.com/?&e=5&f=6&z=6

Dictionary<string, string> dict = new Dictionary<string, string>();
    foreach (var key in Request.QueryString.AllKeys)
    {
        if (key != "a" && key != "b" && key != "c" && key != "d")
        {
            dict.Add(key, Request.QueryString[key]);
        }
    }
queryString = string.Join("&", dict.Select(x => x.Key + "=" + x.Value));

if (!string.IsNullOrEmpty(queryString ))
{
    searchViewModel.CurrQS += "&z=6";
}

I have done this so far. But is it worth converting this to dictionary and then to string for this. Any other better method?

Try `Regex.Replace(queryString, @"(\?[abcd]=.+?|&[abcd]=.+?(?=&)|&[abcd]=.+?$)", "");` — JohnyL, Dec 12 '17 at 07:59

Pranay Rana · Answer 1 · 2017-12-12T07:53:06.543

0

Dictionary<string, string> dict = new Dictionary<string, string>();
    foreach (var key in Request.QueryString.AllKeys)
    {
        if (key != "a" && key != "b" && key != "c" && key != "d")
        {
            dict.Add(key, Request.QueryString[key]);
        }
    }

queryString = Request.RawUrl.Split(new[] {'?'})[0] +
              string.Join("&", dict.Select(x => x.Key + "=" + x.Value));

if (!string.IsNullOrEmpty(queryString ))
{
    queryString  += "&z=6";
}

Easy way out of this is, if you have url then do this:

var stringURL = Request.RawUrl.Split(new[] {'?'});
var urlwithoutQuerystring=stringURL.First();
var newUrl = urlwithoutQuerystring + "?c=abc"

or do like this

var stringURL = Request.RawUrl.Split(new[] {'?'})[0];
var newUrl = strinULR + "?c=abc"

edited Dec 12 '17 at 07:53

answered Dec 12 '17 at 07:43

Pranay Rana

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how would this remove query string keys a,b,c,d? – Sahil Sharma Dec 12 '17 at 07:48
@maverick - if you do this var stringURL = Request.RawUrl.Split(new[] {'?'})[0]; it will give you row url without querystring ...so your query string will get remove ..not need to worry about it..if you want to store data then just store it and replace – Pranay Rana Dec 12 '17 at 07:51
@maverick - updated for you – Pranay Rana Dec 12 '17 at 07:53
@maverick - is that worked for you ?? – Pranay Rana Dec 12 '17 at 09:02
please provide reason of putting - 1?? – Pranay Rana Dec 12 '17 at 10:53

c# request.querystring add and remove few key value pairs in an efficient manner?

1 Answers1