31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
|
---
|
||
|
title: Single Or Default
|
||
|
localeTitle: Único o predeterminado
|
||
|
---
|
||
|
# SingleOrDefault
|
||
|
|
||
|
Devuelve el elemento único en una secuencia que satisface la condición especificada o el valor predeterminado si no se encuentra ningún elemento. El método lanzará una excepción si se encuentra más de un elemento que satisface la condición especificada.
|
||
|
|
||
|
### Firma
|
||
|
|
||
|
```csharp
|
||
|
Enumerable.SingleOrDefault<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)
|
||
|
```
|
||
|
|
||
|
## Ejemplo
|
||
|
|
||
|
```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 purpleFruit = fruits.SingleOrDefault(f => f.Color == "Purple"); // Grape
|
||
|
|
||
|
var greenFruit = fruits.SingleOrDefault(f => f.Color == "Green"); // null
|
||
|
|
||
|
```
|