Get int Id from the Querystring(TryParse)

Posted Date: 18 Nov 2008	Resource Type: Code Snippets	Category: C# Syntax
Author: Jessica	Member Level: Gold
Rating:	Points: 5

Hi All,

We can get int Id from the query string using tryparse method. I have noticed in many code that developer using the following method to get Id.


if(Request.QueryString!=null)
{
  if(Request.QueryString.Count > 0)
  {
    if(Request.QueryString["Id"]!=null && Request.QueryString["Id"]!=string.Empty)
    {
      int Id = Convert.Toint32(Request.QueryString["Id"]);
    }
  }
}

But this is not a good way to do so. One can do this with the TryParse method of the int. Like shown as below.


int Id= 0;
if((int.TryParse(Request["Id"]),out Id)
{
  //do some work
}
else
{
  //do some other work
}

Benefit:
(1) We can avoid too many if..else condition and ultimately less LOC(Line of code)
(2) We can check the querystring null and blank condition simultaneously
(3) Main part is "out Id". If the query string is not null and have value then
it will be assign to the Id variable. So in the if condition we can use it directly.
(4) More Readable.

Limitations:
(1) Only applicable to the int parameter as a query string.

Regards.

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