protected override Expression VisitMethodCall(MethodCallExpression node)
{
Expression result = base.VisitMethodCall(node);
if (node.Method.Name == nameof(Enumerable.OrderBy) || node.Method.Name == nameof(Enumerable.ThenBy))
{
_sqlQuery.OrderBy(ChangeType((LambdaExpression)node.Arguments.OfType <UnaryExpression>().ExtendedSingle($"Finding Operand in {node.Method.Name}").Operand));
}
if (node.Method.Name == nameof(Enumerable.OrderByDescending) || node.Method.Name == nameof(Enumerable.ThenByDescending))
{
_sqlQuery.OrderByDescending(ChangeType((LambdaExpression)node.Arguments.OfType <UnaryExpression>().ExtendedSingle($"Finding Operand in {node.Method.Name}").Operand));
}
return(result);
}
/// <summary>
/// Return posts based on pagination and sorting parameters.
/// </summary>
/// <param name="pageNo">Page index</param>
/// <param name="pageSize">Page size</param>
/// <param name="sortColumn">Sort column name</param>
/// <param name="sortByAscending">True to sort by ascending</param>
/// <returns></returns>
public IList<Post> Posts(int pageNo, int pageSize, string sortColumn, bool sortByAscending)
{
SqlLamBase.SetAdapter(SqlAdapter.SqlServer2008);
var query = new SqlLam<Post>();
switch (sortColumn)
{
case "Title":
query = sortByAscending ? query.OrderBy(x => x.Title) : query.OrderByDescending(x => x.Title);
break;
case "Published":
query = sortByAscending ? query.OrderBy(x => x.Published) : query.OrderByDescending(x => x.Published);
break;
case "Modified":
query = sortByAscending ? query.OrderBy(x => x.Modified) : query.OrderByDescending(x => x.Modified);
break;
default:
query = sortByAscending ? query.OrderBy(x => x.PostedOn) : query.OrderByDescending(x => x.PostedOn);
break;
}
var posts = CONN.SQLQuery<Post>(query.QueryStringPage(pageSize, pageNo), query.QueryParameters);
return posts.ToList();
}
