public static MyODataConfigurates GetConfiguratesFromQueryString(string queryString)
{
var configurates = new MyODataConfigurates();
configurates.PropertiesFilter = GetPropertiesFilter(queryString);
var orders = MatchesBySelector("orderby", queryString);
configurates.OrderBy = orders.Count > 0 ? orders[orders.Count - 1].Groups["value"].Value : "";
var types = MatchesBySelector("ordertype", queryString);
configurates.IsOrderAsceneding = types.Count > 0
? types[types.Count - 1].Groups["value"].Value.ToLower() != "descending"
: true;
return(configurates);
}
public static Expression <Func <T, bool> > CompileFilters <T>(MyODataConfigurates config)
{
var filters = GetFiltersFromConfigurates <T>(config);
var firstFilter = filters.FirstOrDefault();
if (firstFilter == null)
{
return(x => true);
}
var body = firstFilter.Body;
var param = firstFilter.Parameters.ToArray();
foreach (var nextFilter in filters.Skip(1))
{
var nextBody = Expression.Invoke(nextFilter, param);
body = Expression.OrElse(body, nextBody);
}
return(Expression.Lambda <Func <T, bool> >(body, param));
}
public static IEnumerable <T> OrderBy <T>(IEnumerable <T> items, MyODataConfigurates config)
{
var result = items;
if (string.IsNullOrEmpty(config.OrderBy))
{
return(items);
}
if (config.IsOrderAsceneding)
{
result =
result.OrderBy(
item => item.GetValueFromPublicProperyWithIgnoreCase(config.OrderBy));
}
else
{
result =
result.OrderByDescending(
item => item.GetValueFromPublicProperyWithIgnoreCase(config.OrderBy));
}
return(result);
}
public static IEnumerable <T> ApplyMyODataCongigurates <T>(IEnumerable <T> items, MyODataConfigurates config)
{
foreach (var prop in config.PropertiesFilter)
{
items =
items.Where(
item =>
((string)item.GetType().GetTypeInfo().GetProperty(prop.Name).GetValue(item)).IndexOf(
prop.Filter) > -1);
}
if (string.IsNullOrEmpty(config.OrderBy))
{
return(items);
}
if (config.IsOrderAsceneding)
{
items =
items.OrderBy(
item =>
item.GetType()
.GetTypeInfo()
.GetProperty(config.OrderBy,
BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance)
.GetValue(item, null));
}
else
{
items =
items.OrderByDescending(
item =>
item.GetType()
.GetTypeInfo()
.GetProperty(config.OrderBy,
BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance)
.GetValue(item, null));
}
return(items);
}
private static IEnumerable <Expression <Func <T, bool> > > GetFiltersFromConfigurates <T>(MyODataConfigurates config)
{
var filters = new List <Expression <Func <T, bool> > >();
foreach (var prop in config.PropertiesFilter)
{
filters.Add(item => GetFilter(prop, item));
}
return(filters);
}