Convert a Dictionary to string of url parameters?

Question

Is there a way to convert a Dictionary in code into a url parameter string?

e.g.

// An example list of parameters Dictionary<string, object> parameters ...; foreach (Item in List) {     parameters.Add(Item.Name, Item.Value); }  string url = "http://www.somesite.com?" + parameters.XX.ToString(); 

Inside MVC HtmlHelpers you can generate URLs with the UrlHelper (or Url in controllers) but in Web Forms code-behind the this HtmlHelper is not available.

string url = UrlHelper.GenerateUrl("Default", "Action", "Controller",      new RouteValueDictionary(parameters), htmlHelper.RouteCollection ,      htmlHelper.ViewContext.RequestContext, true); 

How could this be done in C# Web Forms code-behind (in an MVC/Web Forms app) without the MVC helper?

Answer 1

One approach would be:

var url = string.Format("http://www.yoursite.com?{0}",     HttpUtility.UrlEncode(string.Join("&",         parameters.Select(kvp =>             string.Format("{0}={1}", kvp.Key, kvp.Value))))); 

You could also use string interpolation as introduced in C#6:

var url = $"http://www.yoursite.com?{HttpUtility.UrlEncode(string.Join("&", parameters.Select(kvp => $"{kvp.Key}={kvp.Value}")))}"; 

And you could get rid of the UrlEncode if you don't need it, I just added it for completeness.

Answer 2

Make a static helper class perhaps:

public static string QueryString(IDictionary<string, object> dict) {     var list = new List<string>();     foreach(var item in dict)     {         list.Add(item.Key + "=" + item.Value);     }     return string.Join("&", list); }