How to reload the current page with a query string parameter

Question

I'm trying to refresh a page when clicking tag href.

But I could not get the current page URI in my MVC Razor view and How I get the current page URI and how I refresh the same page?

e.g.: www.local.url/articles

I need: local.url/articles and local.url/articles?querystring

Answer 1

If you only want to refresh the querystring and nothing else, you don't have to write the url for the current page, you can just write the querystring part:

click <a href="?test">here</a> to set the querystring to "?test" in your current url

If for some reason you still want to add the current url to the link though, you can do it by either finding it from the current request url or from the httpcontext

@{ 
  var option1 = Sitecore.Links.LinkManager.GetItemUrl(Sitecore.Context.Item);
  var option2 = System.Web.HttpContext.Current.Request.Url;
}

Answer 2

You can redirect user to same page by following the steps:

1. Add the javascript function:

function RefreshPage(queryString) {
    var newUrl = window.location.origin + window.location.pathname + "?key=" + queryString;
    window.location.href = newUrl;
    return false;
}

2. Use the JavaScript function in html href tag in view: For example i added in aboutus controller method http://localhost:49422/Home/About

<a href="javascript:void(0)" onclick="RefreshPage('@ViewBag.Key')"  class="btn btn-primary btn-lg">Redirect To Current Page &raquo;</a>

3.Generate the Random string and pass to ViewBag. This is just for the example purpose , you can pass value from Model also: Reference https://stackoverflow.com/questions/1344221/how-can-i-generate-random-alphanumeric-strings

public string GetUniqueKey(int size)
{
    char[] chars =
                "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".ToCharArray();
    byte[] data = new byte[size];
    using (RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider())
    {
        crypto.GetBytes(data);
    }
    StringBuilder result = new StringBuilder(size);
    foreach (byte b in data)
    {
        result.Append(chars[b % (chars.Length)]);
    }
    return result.ToString();
}

4. After following above steps, when user will click on the Href tag then in the url you will see:

http://localhost:49422/Home/About?key=<dynamic string>