32 lines
1022 B
Markdown
32 lines
1022 B
Markdown
---
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title: All
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localeTitle: 所有
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---
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# 所有
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如果集合中的所有元素与谓词匹配，则返回true。
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### 签名
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```csharp
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public static bool All<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
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```
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## 例
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```csharp
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var fruits = new List<Fruit>() {
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new Fruit() { Id = 1, Name = "Orange", Color = "Orange", Quantity: 3 },
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new Fruit() { Id = 2, Name = "Strawberry", Color = "Red", Quantity: 12 },
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new Fruit() { Id = 3, Name = "Grape", Color = "Purple", Quantity: 25 },
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new Fruit() { Id = 4, Name = "Pineapple", Color = "Yellow", Quantity: 1 },
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new Fruit() { Id = 5, Name = "Apple", Color = "Red", Quantity: 5 },
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new Fruit() { Id = 6, Name = "Mango", Color = "Yellow", Quantity: 2 }
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};
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// All Fruit have a quantity greater than 0.
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var allFruitsHaveAQuantity = fruits.All(f => f.Quantity > 0); // true
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// All Fruit have the Color Yellow
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var allYellow = fruits.All(f => f.Color == "Yellow"); // false
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``` |