我根据@Matt Greer的回答构建了这个

他完美地回答了那位警官的问题。

我想要这样的东西，同时保持Any的原始功能，同时还检查null。我张贴这个以防其他人需要类似的东西。

具体来说，我希望仍然能够传递一个谓词。

public static class Utilities
{
    /// <summary>
    /// Determines whether a sequence has a value and contains any elements.
    /// </summary>
    /// <typeparam name="TSource">The type of the elements of source.</typeparam>
    /// <param name="source">The <see cref="System.Collections.Generic.IEnumerable"/> to check for emptiness.</param>
    /// <returns>true if the source sequence is not null and contains any elements; otherwise, false.</returns>
    public static bool AnyNotNull<TSource>(this IEnumerable<TSource> source)
    {
        return source?.Any() == true;
    }

    /// <summary>
    /// Determines whether a sequence has a value and any element of a sequence satisfies a condition.
    /// </summary>
    /// <typeparam name="TSource">The type of the elements of source.</typeparam>
    /// <param name="source">An <see cref="System.Collections.Generic.IEnumerable"/> whose elements to apply the predicate to.</param>
    /// <param name="predicate">A function to test each element for a condition.</param>
    /// <returns>true if the source sequence is not null and any elements in the source sequence pass the test in the specified predicate; otherwise, false.</returns>
    public static bool AnyNotNull<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate)
    {
        return source?.Any(predicate) == true;
    }
}

扩展方法的命名可能会更好。

public static bool IsNullOrEmpty<T>(this IEnumerable<T> enumerable) {
    return enumerable == null || !enumerable.Any();
}

它为null将返回true

enter    public static bool IsNullOrEmpty<T>(this IEnumerable<T> enumerable)
    {

        try
        {
            return enumerable?.Any() != true;
        }
        catch (Exception)
        {

            return true;
        }
   
    }

代码

另一种方法是获取枚举器并调用MoveNext()方法来查看是否有任何项:

if (mylist != null && mylist.GetEnumerator().MoveNext())
{
    // The list is not null or empty
}

这适用于IEnumerable和IEnumerable<T>。

当它是关于引用(可空)类型的，并且项中不期望有空项时，可以使用这一行进行验证

myCollection?.FirstOrDefault() == null

我用简单的if来检查它

看看我的解决方案

foreach (Pet pet in v.Pets)
{
    if (pet == null)
    {
        Console.WriteLine(" No pet");// enumerator is empty
        break;
    }
    Console.WriteLine("  {0}", pet.Name);
}