/// <summary>
/// Get the first or default item using a predicate, order items, load related object using navigationProperties
/// </summary>
/// <param name="predicate"></param>
/// <param name="orderby"></param>
/// <param name="navigationProperties"></param>
/// <returns></returns>
public T FirstOrDefault(Expression <Func <T, bool> > predicate, IGenericDataOrder <T> orderby, params Expression <Func <T, object> >[] navigationProperties)
{
T ret = null;
using (var context = (DbContext)Activator.CreateInstance(ContextType, ContextParameters))
{
IQueryable <T> dbQuery = context.Set <T>();
//apply eager loading
foreach (Expression <Func <T, object> > navigationProperty in navigationProperties)
{
dbQuery = dbQuery.Include <T, object>(navigationProperty);
}
//set the predicate
if (predicate != null)
{
dbQuery = dbQuery.AsNoTracking().Where(predicate);
}
if (orderby != null)
{
//apply order
IOrderedQueryable <T> dbQueryOrdered = orderby.ApplyOrders(dbQuery);
ret = dbQueryOrdered.FirstOrDefault();
}
else
{
ret = dbQuery.FirstOrDefault();
}
}
return(ret);
}
/// <summary>
/// Get items using a predicate, order items and limit with an offset the selection, load related object using navigationProperties
/// </summary>
/// <param name="predicate"></param>
/// <param name="orderby"></param>
/// <param name="skip"></param>
/// <param name="take"></param>
/// <param name="navigationProperties"></param>
/// <returns></returns>
public virtual IList <T> List(Expression <Func <T, bool> > predicate, IGenericDataOrder <T> orderby, Nullable <int> skip, Nullable <int> take, params Expression <Func <T, object> >[] navigationProperties)
{
List <T> ret = new List <T>();
using (var context = (DbContext)Activator.CreateInstance(ContextType, ContextParameters))
{
IQueryable <T> dbQuery = context.Set <T>();
//apply eager loading
foreach (Expression <Func <T, object> > navigationProperty in navigationProperties)
{
dbQuery = dbQuery.Include <T, object>(navigationProperty);
}
//set the predicate
if (predicate != null)
{
dbQuery = dbQuery.AsNoTracking().Where(predicate);
}
if (orderby != null)
{
//apply order
IOrderedQueryable <T> dbQueryOrdered = orderby.ApplyOrders(dbQuery);
//limits
if (skip == null && take == null)
{
ret = dbQueryOrdered.ToList <T>();
}
else if (skip != null && take != null)
{
ret = dbQueryOrdered.Skip((int)skip).Take((int)take).ToList <T>();
}
else if (skip != null && take == null)
{
ret = dbQueryOrdered.Skip((int)skip).ToList <T>();
}
else if (skip == null && take != null)
{
ret = dbQueryOrdered.Take((int)take).ToList <T>();
}
}
else
{
//limits
if (take != null)
{
ret = dbQuery.Take((int)take).ToList <T>();
}
else
{
ret = dbQuery.ToList <T>();
}
}
}
return(ret);
}
/// <summary>
/// Apply order to query
/// </summary>
/// <param name="query"></param>
/// <returns></returns>
public IOrderedQueryable <T> ApplyOrders(IQueryable <T> query)
{
//get the order list
IGenericDataOrder <T>[] orderlist = new IGenericDataOrder <T>[] { };
IGenericDataOrder <T> currentOrder = this;
while (currentOrder != null)
{
orderlist = orderlist.Concat(new IGenericDataOrder <T>[] { currentOrder }).ToArray();
IGenericDataOrder <T> parentOrder = currentOrder.GetParent();
if (parentOrder != null)
{
currentOrder = parentOrder;
}
else
{
currentOrder = null;
}
}
orderlist = orderlist.Reverse().ToArray();
//build the ordered query
IOrderedQueryable <T> queryOrdered = null;
foreach (IGenericDataOrder <T> order in orderlist)
{
if (queryOrdered == null)
{
if (order.SortAscending)
{
queryOrdered = order.ApplyOrderByAscending(query);
}
else
{
queryOrdered = order.ApplyOrderByDescending(query);
}
}
else
{
if (order.SortAscending)
{
queryOrdered = order.ApplyThenByAscending(queryOrdered);
}
else
{
queryOrdered = order.ApplyThenByDescending(queryOrdered);
}
}
}
return(queryOrdered);
}
/// <summary>
/// Get the parent IGenericDataOrder
/// </summary>
public IGenericDataOrder <T> GetParent()
{
IGenericDataOrder <T> parent = _caller as IGenericDataOrder <T>;
if (parent != null)
{
return(parent);
}
else
{
return(null);
}
}
/// <summary>
/// Get the first or default item, order items
/// </summary>
/// <param name="orderby"></param>
/// <returns></returns>
public T FirstOrDefault(IGenericDataOrder <T> orderby)
{
return(FirstOrDefault(null, orderby));
}
/// <summary>
/// Get the first or default item using a predicate, order items
/// </summary>
/// <param name="predicate"></param>
/// <param name="orderby"></param>
/// <returns></returns>
public T FirstOrDefault(Expression <Func <T, bool> > predicate, IGenericDataOrder <T> orderby)
{
return(FirstOrDefault(predicate, orderby, new Expression <Func <T, object> >[] { }));
}
/// <summary>
/// Get items using a predicate, order items and limit with an offset the selection
/// </summary>
/// <param name="predicate"></param>
/// <param name="orderby"></param>
/// <param name="skip"></param>
/// <param name="take"></param>
/// <param name="navigationProperties"></param>
/// <returns></returns>
public IList <T> List(Expression <Func <T, bool> > predicate, IGenericDataOrder <T> orderby, Nullable <int> skip, Nullable <int> take)
{
return(List(predicate, orderby, skip, take, new Expression <Func <T, object> >[] { }));
}
/// <summary>
/// Get all items, order items
/// </summary>
/// <param name="orderby"></param>
/// <returns></returns>
public IList <T> List(IGenericDataOrder <T> orderby)
{
return(List(null, orderby, null, null));
}
/// <summary>
/// Get all items, order items and limit the selection
/// </summary>
/// <param name="orderby"></param>
/// <param name="take"></param>
/// <returns></returns>
public IList <T> List(IGenericDataOrder <T> orderby, Nullable <int> take)
{
return(List(null, orderby, null, take));
}
/// <summary>
/// Get items using a predicate, order items
/// </summary>
/// <param name="predicate"></param>
/// <param name="orderby"></param>
/// <returns></returns>
public IList <T> List(Expression <Func <T, bool> > predicate, IGenericDataOrder <T> orderby)
{
return(List(predicate, orderby, null, null));
}
/// <summary>
/// Get items using a predicate, order items and limit the selection
/// </summary>
/// <param name="predicate"></param>
/// <param name="orderby"></param>
/// <param name="take"></param>
/// <returns></returns>
public IList <T> List(Expression <Func <T, bool> > predicate, IGenericDataOrder <T> orderby, Nullable <int> take)
{
return(List(predicate, orderby, null, take));
}
