static IQueryable <TEntity> BuildOrderByThenBy <TEntity>(this IQueryable <TEntity> query, SearchySort searchySort, Type type, bool mainOrderBy)
{
switch (true)
{
case object _ when type.Equals(typeof(int)):
if (mainOrderBy)
{
return(query.BuildOrderBy <int, TEntity>(searchySort));
}
else
{
return(query.BuildThenBy <int, TEntity>(searchySort));
}
case object _ when type.Equals(typeof(string)):
if (mainOrderBy)
{
return(query.BuildOrderBy <string, TEntity>(searchySort));
}
else
{
return(query.BuildThenBy <string, TEntity>(searchySort));
}
case object _ when type.Equals(typeof(DateTime?)):
if (mainOrderBy)
{
return(query.BuildOrderBy <DateTime?, TEntity>(searchySort));
}
else
{
return(query.BuildThenBy <DateTime?, TEntity>(searchySort));
}
case object _ when type.Equals(typeof(DateTime)):
if (mainOrderBy)
{
return(query.BuildOrderBy <DateTime, TEntity>(searchySort));
}
else
{
return(query.BuildThenBy <DateTime, TEntity>(searchySort));
}
case object _ when type.Equals(typeof(byte)):
if (mainOrderBy)
{
return(query.BuildOrderBy <byte, TEntity>(searchySort));
}
else
{
return(query.BuildThenBy <byte, TEntity>(searchySort));
}
case object _ when type.Equals(typeof(short)):
if (mainOrderBy)
{
return(query.BuildOrderBy <short, TEntity>(searchySort));
}
else
{
return(query.BuildThenBy <short, TEntity>(searchySort));
}
case object _ when type.Equals(typeof(decimal)):
if (mainOrderBy)
{
return(query.BuildOrderBy <decimal, TEntity>(searchySort));
}
else
{
return(query.BuildThenBy <decimal, TEntity>(searchySort));
}
default:
throw new SWException("Unsupported sort datatype: " + type.ToString());
}
}
static IQueryable <TEntity> BuildThenBy <U, TEntity>(this IQueryable <TEntity> query, SearchySort searchySort)
{
var pe = Expression.Parameter(typeof(TEntity), "");
var orderedQuery = (IOrderedQueryable <TEntity>)query;
if (searchySort.Sort == SearchySortOrder.ASC)
{
return(orderedQuery.ThenBy(Expression.Lambda <Func <TEntity, U> >(Expression.Property(pe, searchySort.Field), new ParameterExpression[] { pe })));
}
else
{
return(orderedQuery.ThenByDescending(Expression.Lambda <Func <TEntity, U> >(Expression.Property(pe, searchySort.Field), new ParameterExpression[] { pe })));
}
}