使用LINQ查找价格最便宜的产品？

Question

我正在学习LINQ,我想从以下列表中找到最便宜的产品:

List<Product> products = new List<Product> { 
                new Product {Name = "Kayak", Price = 275M, ID=1}, 
                new Product {Name = "Lifejacket", Price = 48.95M, ID=2}, 
                new Product {Name = "Soccer ball", Price = 19.50M, ID=3}, 
            };

我想出了以下内容,但不知何故感觉它不是最好的方法:

var cheapest = products.Find(p => p.Price == products.Min(m => m.Price));

你能告诉我实现这个目标的正确方法吗？

Answer 1

你应该使用MinBy:

public static TSource MinBy<TSource>(
    this IEnumerable<TSource> source,
    Func<TSource, IComparable> projectionToComparable
) {
    using (var e = source.GetEnumerator()) {
        if (!e.MoveNext()) {
            throw new InvalidOperationException("Sequence is empty.");
        }
        TSource min = e.Current;
        IComparable minProjection = projectionToComparable(e.Current);
        while (e.MoveNext()) {
            IComparable currentProjection = projectionToComparable(e.Current);
            if (currentProjection.CompareTo(minProjection) < 0) {
                min = e.Current;
                minProjection = currentProjection;
            }
        }
        return min;                
    }
}

只需将其添加为public static类(EnumerableExtensions？)中的方法即可.

现在你可以说

var cheapest = products.MinBy(x => x.Price);