39 lines
1.5 KiB
C#
39 lines
1.5 KiB
C#
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);
|
|
}
|
|
}
|
|
}
|