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public static float? Average(this IEnumerable<float?> source) { if (source == null) throw Error.ArgumentNull("source"); double sum = 0; long count = 0 阅读全文
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官网上给的案例: // Custom class. class Clump<T> : List<T> { // Custom implementation of Where(). public IEnumerable<T> Where(Func<T, bool> predicate) { Conso 阅读全文
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相关源码: public static bool All<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate) { if (source == null) throw Error.ArgumentNull( 阅读全文