Question

I need to build a URL with a query string in C#. What is the best approach to doing this? Right now, I’m using something like,

string url = String.Format('foo.aspx?{0}={1}&{2}={3}', 'a', 123, 'b', 456); 

Is there a better, preferred approach?

Answer 1

I think that is a good method if it’s always know what parameters you have, if this is unknown at the time you could always keep a List<KeyValuePair<string,string>> with the key being the name and value being the value, then build the query string using a foreach loop like

StringBuilder sb = new StringBuilder(); foreach(KeyValuePair<string,string> q in theList) {  // build the query string here.     sb.Append(string.format('{0}={1}&', q.Key, q.Value); } 

note: the code is not tested and has not been compiled, so it may not work exactly as is.