GetSearchCriteria method that generates dictionary of SearchParameters

gistfile1.cs

// All site search criteria in a dictionary for easy lookup/manipulation
// when dynamically building the query.
public static Dictionary<string, SearchParameter> GetSearchCriteria()
{
   var results = new Dictionary<string, SearchParameter>
      {
         {
            "SiteID", new SearchParameter
               (
                  "SiteID", 
                  "(it.site_uid LIKE {0})", 
                  "@site_uid",
                  "site_uid",
                  "System.String",
                  true,
                  false
               )
         },
         {
            "SiteName", new SearchParameter
               (
                  "SiteName", 
                  "(it.site_name LIKE {0})", 
                  "@site_name", 
                  "site_name",
                  "System.String",
                  true,
                  false
               )
         },
         {
            "MarketName", new SearchParameter
               (
                  "MarketName", 
                  "(it.market_name = {0})", 
                  "@market_name",
                  "market_name",
                  "System.String" ,
                  false,
                  true
               )
         },
         {
            "SiteClassDesc", new SearchParameter
               (
                  "SiteClassDesc", 
                  "(it.site_class_desc = {0})", 
                  "@site_class_desc",
                  "site_class_desc",
                  "System.String",
                  false,
                  true
               )
         },
         {
            "SiteStatusDesc", new SearchParameter
               (
                  "SiteStatusDesc", 
                  "(it.site_status_desc = {0})", 
                  "@site_status_desc",
                  "site_status_desc",
                  "System.String",
                  false,
                  true
               )
         },
         {
            "SiteOnlineFrom", new SearchParameter
               (
                   "SiteOnlineFrom", 
                   "(it.site_online_date >= {0})", 
                   "@site_online_date",
                   "site_online_date",
                   "System.DateTime"
                )
          },
          {
             "SiteOnlineTo", new SearchParameter
                (
                   "SiteOnlineTo", 
                   "(it.site_online <= {0})",
                   "@site_online",
                   "site_online_date",
                   "System.DateTime"
                )
          },
          {
             "SiteOnlineRange", new SearchParameter
                (
                   "SiteOnlineRange", 
                   "(it.site_online_date >= {0} AND it.site_online_date <= {1})",
                   "@site_online_date_from",
                   "site_online_date_from",
                   "System.DateTime",
                   "@site_online_date_to",
                   "site_online_date_to",
                   "System.DateTime"
                )
          },
          {
             "SiteOnlineStatus", new SearchParameter
                (                   
                   "SiteOnlineStatus", 
                   "(it.site_online_status_id = {0})", 
                   "@site_online_status_id", 
                   "site_online_status_id",
                   "System.Int32"
                )
          }
      };

   return results;
}