How to add one parameter to current url in c#

Question

I have 2 links

 <li class="active">
  <a href="<%#CurrentSearchUrl%>"><span>Current search Page
 </span></a> 

  <li><a href="<%#CurrentSearchUrlParam%>"><span>Add param </span>
      </a>

in the Page_Load

    CurrentSearchUrl = Request.Url.AbsoluteUri;
    CurrentSearchUrlParam = Request.Url+"&discount=1";

param is added but url is not correct my current url is

http://localhost:1067/search/default.aspx?q=test

I want to add one parameter, the desired result should be

http://localhost:1067/search/default.aspx?q=test&discount=1

Thanks in advance

You are looking for [Query String](http://stackoverflow.com/questions/19987952/how-to-properly-use-a-querystring-in-net-asp-c) — Wahtever, Feb 18 '14 at 13:32
CurrentSearchUrlParam and CurrentSearchUrlDiscount are different. are you using correct parameter on page? — Amit Tiwari, Feb 18 '14 at 13:52

score 22 · Answer 1 · edited Apr 27 '23 at 13:50

22

var uriBuilder = new UriBuilder(Request.Url.AbsoluteUri);
var paramValues = HttpUtility.ParseQueryString(uriBuilder.Query);
paramValues.Add("param1", "value1");
paramValues.Add("param2", "value2");
uriBuilder.Query = paramValues.ToString();

Link1.HRef=uriBuilder.Uri;

edited Apr 27 '23 at 13:50

Dan Atkinson

11,391
14
81
114

answered Feb 18 '14 at 13:56

Victor Mukherjee

10,487
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97

This is actually the correct answer, I think, since it takes care of the case in which the original URL had no querystring parameters as well. – Francesco Gallarotti Apr 25 '14 at 09:47

score 11 · Answer 2 · edited Apr 27 '23 at 13:51

11

Be careful of already existing parameters. Here is a small modification of Victor' code:

var uriBuilder = new UriBuilder(Request.Url.AbsoluteUri);
var paramValues = HttpUtility.ParseQueryString(uriBuilder.Query);

if(paramValues.Get("param1")!=null) paramValues.Remove("param1");
paramValues.Add("param1", "value1");
paramValues.Add("param2", "value2");
uriBuilder.Query = paramValues.ToString();

Link1.HRef=uriBuilder.Uri;

edited Apr 27 '23 at 13:51

Dan Atkinson

11,391
14
81
114

answered Mar 03 '17 at 15:58

bruno leclerc

333
2
9

thank you but why the page won't open up, it just change the parameter? – ABDULLAH MAKKI Feb 25 '20 at 07:12

Habib Rahmoun · Accepted Answer · 2014-02-18T13:51:57.693

2

There are many way to do that. For example :

Your HTML :

<li class="active">
  <a href="" runat="server" ID="Link1"><span>Current search Page
 </span></a> 

  <li><a href="" runat="server" ID="Link2"><span>Add param </span>
      </a>

In the Page_Load :

Link1.HRef = HttpContext.Current.Request.Url.ToString();
Link2.HRef = HttpContext.Current.Request.Url.ToString()+"&discount=1";

edited Feb 18 '14 at 13:51

answered Feb 18 '14 at 13:42

Habib Rahmoun

218
2
8

what I did gives me same result as what you propose – Alex Feb 18 '14 at 13:53
2

What if there are other parameters in the url? – Ben Bozorg Jan 18 '17 at 23:56
same question here what if there's a parameter in the url and i need to replace after doing so? – ABDULLAH MAKKI Feb 25 '20 at 07:01

How to add one parameter to current url in c#

3 Answers3

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