Returns true if the provided predicate function returns true for all elements in a collection, false otherwise.

Use IEnumerable.ToArray(), Array.TrueForAll() to test if all elements in the collection return true based on the predicate function, match.
Omit the predicate function, match, to use the overload that checks if each value is different from null by default.

代码片段

using System.Collections.Generic;
using System.Linq;

public static partial class _30s 
{
  public static bool All<T>(IEnumerable<T> data, Predicate<T> match) 
  {
    return Array.TrueForAll(data.ToArray(), match);
  }
  public static bool All<T>(IEnumerable<T> data) 
  {
    return Array.TrueForAll(data.ToArray(), val => val != null);
  }
}

使用样例

int[] nums = { 4, 2, 3 };

_30s.All(nums, x => x > 1); // true
_30s.All(nums); // true