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OltOrderByExtensions.cs
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OltOrderByExtensions.cs
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using OLT.Core;
using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Text;
namespace System.Linq
{
public static class OltOrderByExtensions
{
/// <summary>
/// Order <see cref="IQueryable"/> by name of property (<paramref name="memberPath"/>) in class
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="queryable"></param>
/// <param name="memberPath"></param>
/// <param name="isAscending"></param>
/// <returns></returns>
public static IOrderedQueryable<T> OrderByPropertyName<T>(this IQueryable<T> queryable, string memberPath, bool isAscending)
{
if (queryable == null)
{
throw new ArgumentNullException(nameof(queryable));
}
var parameter = Expression.Parameter(typeof(T), "item");
var member = memberPath.Split('.').Aggregate((Expression)parameter, Expression.PropertyOrField);
var keySelector = Expression.Lambda(member, parameter);
var methodCall = Expression.Call(typeof(Queryable), isAscending ? "OrderBy" : "OrderByDescending", new[] { parameter.Type, member.Type }, queryable.Expression, Expression.Quote(keySelector));
return (IOrderedQueryable<T>)queryable.Provider.CreateQuery(methodCall);
}
/// <summary>
/// Order <see cref="IQueryable"/> by <see cref="IOltSortParams.PropertyName"/> in class
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="queryable"></param>
/// <param name="sortParams"></param>
/// <returns></returns>
public static IOrderedQueryable<T> OrderBy<T>(this IQueryable<T> queryable, IOltSortParams sortParams)
{
if (sortParams?.PropertyName == null)
{
throw new ArgumentNullException(nameof(sortParams));
}
return OrderByPropertyName(queryable, sortParams.PropertyName, sortParams.IsAscending);
}
/// <summary>
/// Order <see cref="IQueryable"/> by <see cref="IOltSortParams.PropertyName"/> in class
/// Defaults to <paramref name="defaultOrderBy"/> is <paramref name="sortParams"/> is null
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="queryable"></param>
/// <param name="sortParams"></param>
/// <param name="defaultOrderBy"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static IQueryable<T> OrderBy<T>(this IQueryable<T> queryable, IOltSortParams sortParams, Func<IQueryable<T>, IQueryable<T>> defaultOrderBy)
{
if (queryable == null)
{
throw new ArgumentNullException(nameof(queryable));
}
if (defaultOrderBy == null)
{
throw new ArgumentNullException(nameof(defaultOrderBy));
}
if (sortParams?.PropertyName != null && !string.IsNullOrEmpty(sortParams.PropertyName))
{
return OrderBy(queryable, sortParams);
}
return defaultOrderBy(queryable);
}
}
}