//public static IEnumerable<T> FilterBy<T, TKey>(
// this IEnumerable<T> items
// , Filter filter
// , Expression<Func<T, TKey>> keySelector)
//{
// var fields = new FieldMap(filter);
// return DoFilterBy(items, fields, keySelector);
//}
//public static IEnumerable<T> ThenBy<T, TKey>(
// this IEnumerable<T> items
// , Filter filter
// , Expression<Func<T, TKey>> keySelector)
//{
// var fields = new FieldMap(filter);
// return DoFilterBy(items, fields, keySelector);
//}
private static IEnumerable <T> DoFilterBy <T, TKey>(
this IEnumerable <T> items
, FieldMap fields
, Expression <Func <T, TKey> > keySelector)
{
if (fields == null || fields.Count == 0)
{
return(items);
}
var expression = ExpressionUtils.FindMemberExpression(keySelector);
if (expression == null)
{
throw new Exception("A expressão não é válida. Apenas um seletor de propriedade de objeto é suportado.");
}
var name = expression.Member.Name;
var field = fields.FirstOrDefault(x => x.Key.EqualsIgnoreCase(name));
if (field.Key != null)
{
var comparison = CreateComparisonExpression <T>(field.Key, field.Value, forSql: false);
items = items.Where(comparison.Compile());
}
return(items);
}
private static ISortableEnumerable <T> DoSortBy <T, TKey>(
this IEnumerable <T> items
, Sort sort
, Expression <Func <T, TKey> > keySelector
, bool reset)
{
if (sort == null)
{
return(new SortableEnumerable <T>(items));
}
var expression = ExpressionUtils.FindMemberExpression(keySelector);
if (expression == null)
{
throw new Exception("A expressão não é válida. Apenas um seletor de propriedade de objeto é suportado.");
}
var name = expression.Member.Name;
var field = sort.GetSortedField(name);
if (field?.Order == SortOrder.Ascending)
{
var source = (items as ISortableEnumerable <T>)?.Source ?? items;
if (reset)
{
items = source.OrderBy(keySelector.Compile());
}
else
{
items =
(source is IOrderedEnumerable <T>)
? ((IOrderedEnumerable <T>)source).ThenBy(keySelector.Compile())
: source.OrderBy(keySelector.Compile());
}
}
if (field?.Order == SortOrder.Descending)
{
var source = (items as ISortableEnumerable <T>)?.Source ?? items;
if (reset)
{
items = source.OrderByDescending(keySelector.Compile());
}
else
{
items =
(source is IOrderedEnumerable <T>)
? ((IOrderedEnumerable <T>)source).ThenByDescending(keySelector.Compile())
: source.OrderByDescending(keySelector.Compile());
}
}
return(new SortableEnumerable <T>(items));
}
public static Sort AddField <T>(this Sort sort, Expression <Func <T, object> > keySelector)
{
var expression = ExpressionUtils.FindMemberExpression(keySelector);
if (expression == null)
{
throw new Exception("A expressão não é válida. Apenas um seletor de propriedade de objeto é suportado.");
}
var fieldName = expression.Member.Name;
sort.Add(fieldName);
return(sort);
}
private static void ExtractInfo <T>(
Expression <Func <T, object> > keySelector
, out string fieldName
, out string fieldTitle
, out string fieldDataType)
{
var expression = ExpressionUtils.FindMemberExpression(keySelector);
if (expression == null)
{
throw new Exception("A expressão não é válida. Apenas um seletor de propriedade de objeto é suportado.");
}
var memberType =
(expression.Member as PropertyInfo)?.PropertyType
?? (expression.Member as System.Reflection.FieldInfo)?.FieldType
?? typeof(string);
fieldName = Conventions.MakeName(expression.Member.Name);
fieldTitle = Conventions.MakeTitle(expression.Member.Name);
fieldDataType = Conventions.MakeDataType(memberType);
}