32 lines
1.1 KiB
C#
32 lines
1.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Threading.Tasks;
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using Generic.Contracts.Generics;
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namespace Generic.Services;
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public static class QueryableExtensions
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{
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public static IQueryable<T> ApplySorting<T>(this IQueryable<T> source, SortModel sortBy)
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{
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// Parameter for lambda expression, e.g., "p" in "p => p.Property"
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var parameter = Expression.Parameter(typeof(T), "p");
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// Access the property on the parameter, e.g., "p.Property"
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var property = Expression.Property(parameter, sortBy.SortBy);
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// Cast property access to an object (boxing value types)
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var converted = Expression.Convert(property, typeof(object));
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// Create the lambda expression, e.g., "p => (object)p.Property"
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var keySelector = Expression.Lambda<Func<T, object>>(converted, parameter);
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// Apply OrderBy or OrderByDescending based on the ascending flag
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return sortBy.SortDirection == SortDir.Ascending
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? source.OrderBy(keySelector)
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: source.OrderByDescending(keySelector);
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}
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}
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