I need explanations.. I using C#.NET to web applications, I always write:
string val = Request.QueryString["foo"];
and then
if(!string.IsNullOrEmpty(val))
What's the difference:
string val = Request.QueryString["foo"];
I was advised to do:
string val = Request.QueryString["foo"] as string;
if(!string.IsNullOrEmpty(val))
What's the difference?
The first is better:
string val = Request.QueryString["foo"];
The second version returns null if the result of the call is not a string, but you know it always will be a string because the QueryString member has type NameValueCollection. The indexer is defined to return a string:
public class NameValueCollection : NameObjectCollectionBase
{
// ...
public string this[string name] { get; set; }
// ...
}
The as string is redundant as Request.QueryString["foo"] already is a string. (So there is no other difference than the second makes you look like you don't know your framework ;-) )
