freeCodeCamp/guide/chinese/csharp/linq/all/index.md

title, localeTitle

title	localeTitle
All	所有

所有

如果集合中的所有元素与谓词匹配，则返回true。

签名

public static bool All<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate); 

例

var fruits = new List<Fruit>() { 
    new Fruit() { Id = 1, Name = "Orange",     Color = "Orange", Quantity: 3   }, 
    new Fruit() { Id = 2, Name = "Strawberry", Color = "Red",    Quantity: 12  }, 
    new Fruit() { Id = 3, Name = "Grape",      Color = "Purple", Quantity: 25  }, 
    new Fruit() { Id = 4, Name = "Pineapple",  Color = "Yellow", Quantity: 1   }, 
    new Fruit() { Id = 5, Name = "Apple",      Color = "Red",    Quantity: 5   }, 
    new Fruit() { Id = 6, Name = "Mango",      Color = "Yellow", Quantity: 2   } 
 }; 
 
 // All Fruit have a quantity greater than 0. 
 var allFruitsHaveAQuantity = fruits.All(f => f.Quantity > 0); // true 
 // All Fruit have the Color Yellow 
 var allYellow = fruits.All(f => f.Color == "Yellow"); // false