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using System.Linq;
using System.Web.Util;
namespace System.Web.UI.WebControls {
internal static class QueryableHelpers {
//Methods in this class are found using GetMethod - so avoid defining overloads of the methods.
//This method is a helper to be able to use reflection on only this method instead of each SortyBy, Skip and Take methods.
public static IQueryable<T> SortandPageHelper<T>(IQueryable<T> queryable, int? startRowIndex, int? maxRowIndex, string sortExpression) where T : class {
if (queryable == null)
throw new ArgumentNullException("queryable");
if (!String.IsNullOrEmpty(sortExpression)) {
queryable = queryable.SortBy<T>(sortExpression);
}
if (startRowIndex != null && maxRowIndex != null) {
queryable = queryable.Skip<T>((int)startRowIndex).Take<T>((int)maxRowIndex);
}
return queryable;
}
//This method is a helper to be able to use GetMethod to get this one method and execute instead of finding the Count method on Queryable class.
public static int CountHelper<T>(IQueryable<T> queryable) where T : class {
if (queryable == null)
throw new ArgumentNullException("queryable");
return queryable.Count<T>();
}
public static bool IsOrderingMethodFound<T>(IQueryable<T> queryable) where T : class {
return OrderingMethodFinder.OrderMethodExists(queryable.Expression);
}
}
}
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