---
title: Select
localeTitle: 选择
---
# 选择

从数据集中投射数据。

### 签名

```csharp
Enumerable.Select<TSource, TResult> Method (IEnumerable<TSource>, Func<TSource, TResult>) 
```

## 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   } 
 }; 
 
 var mangoQnt = fruits.Where(f => f.Name == "Mango").Select(f => f.Quantity).FirstOrDefault(); // 2 
 
 var grapeColor = fruits.Where(f => f.Name == "Grape").Select(f => f.Color).FirstOrDefault(); // Purple 

```