private IQueryable <XElement> ProcessFilter(string filterOption, IQueryable <XElement> iQueryable)
{
IQueryable <XElement> source = iQueryable;
ParameterExpression[] it = new ParameterExpression[] { Expression.Parameter(source.ElementType, "") };
DynamicQueryable.OGDIExpressionParser parser = new DynamicQueryable.OGDIExpressionParser(it, filterOption, null, ColumnsInformation.ToArray());
LambdaExpression lambda = Expression.Lambda(parser.Parse(typeof(bool)), it);
IQueryable <XElement> result = (IQueryable <XElement>)source.Provider.CreateQuery(
Expression.Call(
typeof(Queryable), "Where",
new Type[] { source.ElementType },
source.Expression, Expression.Quote(lambda)));
return(result);
}
private IQueryable <XElement> ProcessOrder(string orderOption, IQueryable <XElement> iQueryable)
{
IQueryable <XElement> source = iQueryable;
ParameterExpression[] it = new ParameterExpression[] { Expression.Parameter(source.ElementType, "") };
DynamicQueryable.OGDIExpressionParser parser = new DynamicQueryable.OGDIExpressionParser(it, orderOption, null, ColumnsInformation.ToArray());
IEnumerable <DynamicQueryable.DynamicOrdering> orderings = parser.ParseOrdering();
Expression queryExpr = source.Expression;
string methodAsc = "OrderBy";
string methodDesc = "OrderByDescending";
foreach (DynamicQueryable.DynamicOrdering o in orderings)
{
queryExpr = Expression.Call(
typeof(Queryable), o.Ascending ? methodAsc : methodDesc,
new Type[] { source.ElementType, o.Selector.Type },
queryExpr, Expression.Quote(Expression.Lambda(o.Selector, it)));
methodAsc = "ThenBy";
methodDesc = "ThenByDescending";
}
IQueryable <XElement> result = (IQueryable <XElement>)source.Provider.CreateQuery(queryExpr);
return(result);
}