38 lines
1.3 KiB
Markdown
38 lines
1.3 KiB
Markdown
---
|
||
title: Any
|
||
localeTitle: 任何
|
||
---
|
||
# 任何
|
||
|
||
如果至少有一个元素与谓词匹配，则返回true。 当使用空谓词（只有.Any（），而没有任何东西）时，如果集合不为空，它将返回true。
|
||
|
||
### 签名
|
||
|
||
```csharp
|
||
public static bool Any<TSource>(this IEnumerable<TSource> source);
|
||
public static bool Any<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
|
||
```
|
||
|
||
## 例
|
||
|
||
```csharp
|
||
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 }
|
||
};
|
||
|
||
// Check if any Fruits have a quantity greater than 20
|
||
var anyFruitGreaterThanTwenty = fruits.Any(f => f.Quantity > 20); // true
|
||
|
||
// Any Fruit with color Green
|
||
var anyGreen = fruits.Any(f => f.Color == "Green"); // false
|
||
|
||
var hasFruits = fruits.Any(); // true
|
||
|
||
var hasYellowFruit = fruits.Any(f => f.Color == "Yellow"); // true
|
||
|
||
``` |