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BOOK: ASP.NET 2.0 Website Programming Problem Design Solution ISBN: 978-0-7645-8464-0
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Old December 15th, 2009, 03:51 PM
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Default EnsureValidSortExpression method

hi

The following questions all refer to the EnsureValidSortExpression method ( page 397 ):


a) I assume the reason we replace substring “title” with “tbh_posts.title” is so that SQL server processing our query doesn’t get confused whether we are referring to tbh_Forums.Title or to tbh_Post.Title column:

Code:
         if (sortExpr.StartsWith("title"))
              sortExpr = sortExpr.Replace("title", "tbh_posts.title");


b) For each of the GridView’s columns that enable sorting, EnsureValidSortExpression method checks whether supplied sortExpression parameter equals to one of three kinds of strings à “column_name” or “column_name desc” or “column_name asc”. GridView automatically appends “ASC" or “DESC” to a “column_name”, so I don’t see the point in EnsureValidSortExpression also checking whether supplied parameter equals to “column_name” type of string, since as far as I know, sortExpression string will always also contain “ASC” or “DESC” value?! Thus, wouldn’t the following code be just as efficient:


Code:
      protected virtual string EnsureValidSortExpression(string sortExpression)
        { 
  ... 
   
  if (!sortExpr.Equals("lastpostdate asc") && !sortExpr.Equals("lastpostdate desc") &&
              !sortExpr.Equals("viewcount asc") && !sortExpr.Equals("viewcount desc") &&
              !sortExpr.Equals("replycount asc") && !sortExpr.Equals("replycount desc") &&
              !sortExpr.Equals("addeddate asc") && !sortExpr.Equals("addeddate desc") &&
              !sortExpr.Equals("addedby asc") && !sortExpr.Equals("addedby desc") &&
              !sortExpr.Equals("title asc") && !sortExpr.Equals("title desc") &&
              !sortExpr.Equals("lastpostby asc") && !sortExpr.Equals("lastpostby desc"))
           {
              sortExpr = "lastpostdate desc";
           }
   
  ...
thanx
 


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