Question

I have converted 4,000 lines of code from VB.net to c#… I am totally tripped up on this one problem. This keeps giving me the error that “Only assignment, call increment, decrement, await, and new object expressions can be used as a statement”

Any help on what the error is here? It also is throwing an error that a query body must end with a select clause or a group clause.

protected static string AssembleArgumentString(Dictionary<string, string> @params,   bool urlEncode)
{
   if (urlEncode) {
     return string.Join("&", (from kv in @params where !string.IsNullOrEmpty(kv.Value)kv.Key + "=" + System.Web.HttpUtility.UrlEncode(kv.Value)).ToArray);
   } 
   else {
     return string.Join("&", (from kv in @params where !string.IsNullOrEmpty(kv.Value)kv.Key + "=" + kv.Value).ToArray);
   } 
 }

Answer 1

You need a select clause in your LINQ query. For example:

return string.Join("&", (from kv in @params where !string.IsNullOrEmpty(kv.Value) select kv.Key + "=" + kv.Value).ToArray());

Also, don’t forget the () at the end of the ToArray method call. You actually don’t even need the ToArray() because String.Join() can take an IEnumerable as well.