/// <summary>
/// Create a dynamic where clause for a given property selector, comparison method and reference value.
/// </summary>
/// <typeparam name="T">The type of the query data.</typeparam>
/// <param name="query">The query to filter.</param>
/// <param name="selector">The property selector to parse.</param>
/// <param name="comparer">The comparison method to use.</param>
/// <param name="value">The reference value to compare with.</param>
/// <param name="provider">The culture-specific formatting information.</param>
/// <returns>The filtered query.</returns>
public static IAsyncQueryable <T> Where <T>(this IAsyncQueryable <T> query, string selector, string comparer, string value, IFormatProvider provider = null)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
if (string.IsNullOrEmpty(selector))
{
throw new ArgumentNullException(nameof(selector));
}
if (string.IsNullOrEmpty(comparer))
{
throw new ArgumentNullException(nameof(comparer));
}
var target = Expression.Parameter(typeof(T));
var comparison = DynamicQuery.CreateComparison(target, selector, comparer, value, provider);
return(query.Provider.CreateQuery <T>(CreateAsyncWhereClause(target, query.Expression, comparison)));
}
/// <summary>
/// Create a dynamic where clause for a given property selector, comparison method and reference value.
/// </summary>
/// <param name="query">The query to filter.</param>
/// <param name="selector">The property selector to parse.</param>
/// <param name="comparer">The comparison method to use.</param>
/// <param name="value">The reference value to compare with.</param>
/// <param name="provider">The culture-specific formatting information.</param>
/// <returns>The filtered query.</returns>
public static IQueryable Where(this IQueryable query, string selector, DynamicCompare comparer, string value, IFormatProvider provider = null)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
if (string.IsNullOrEmpty(selector))
{
throw new ArgumentNullException(nameof(selector));
}
if (!Enum.IsDefined(typeof(DynamicCompare), comparer))
{
throw new ArgumentOutOfRangeException(nameof(comparer));
}
var target = Expression.Parameter(query.ElementType);
var comparison = DynamicQuery.CreateComparison(target, selector, comparer, value, provider);
return(query.Provider.CreateQuery(CreateWhereClause(target, query.Expression, comparison)));
}
