/// <summary>
/// Filters a sequence of values based on a filter.
/// </summary>
/// <typeparam name="T">The element type of the sequence.</typeparam>
/// <param name="source">An <see cref="IQueryable{T}"/> to filter.</param>
/// <param name="filter">A filter to test each element for a condition.</param>
/// <returns>An <see cref="IQueryable{T}"/> that contains elements from the input sequence that satisfy the condition specified by filter.</returns>
/// <exception cref="ArgumentNullException">Thrown when source or filter is null.</exception>
public static IQueryable <T> Filter <T>(this IQueryable <T> source, QueryableFilter <T> filter)
{
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
return(filter.Apply(source));
}
/// <summary>
/// Filters a sequence of values based on a query string.
/// </summary>
/// <typeparam name="T">The element type of the sequence.</typeparam>
/// <param name="source">An <see cref="IQueryable{T}"/> to filter.</param>
/// <param name="filterQuery">A query string to be interpreted as a filter to test each element for a condition.</param>
/// <returns>An <see cref="IQueryable{T}"/> that contains elements from the input sequence that satisfy the condition specified by filter query.</returns>
/// <exception cref="ArgumentNullException">Thrown when source is null.</exception>
/// <exception cref="ArgumentException">Thrown when filter query is invalid.</exception>
public static IQueryable <T> Filter <T>(this IQueryable <T> source, string filterQuery)
{
return(QueryableFilter.TryParse(filterQuery, out QueryableFilter <T> filter)
? source.Filter(filter)
: throw new ArgumentException("Invalid filter query", nameof(filterQuery)));
}
public static IQueryable <TData> Filter <TModel, TData>(this IQueryable <TData> source, IMapper mapper, QueryableFilter <TModel> filter)
{
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
if (mapper == null)
{
throw new ArgumentNullException(nameof(mapper));
}
var f = mapper.MapExpression <Expression <Func <TData, bool> > >(filter.FilterExpression);
return(source.WhereIf(f != null, f));
}
public static IQueryable <TData> Filter <TModel, TData>(this IQueryable <TData> source, IMapper mapper, string filterQuery)
{
return(QueryableFilter.TryParse(filterQuery, out QueryableFilter <TModel> filter)
? source.Filter(mapper, filter)
: throw new ArgumentException("Invalid filter query", nameof(filterQuery)));
}
