31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
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---
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title: Single Or Default
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localeTitle: Único o predeterminado
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---
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# SingleOrDefault
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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.
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### Firma
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```csharp
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Enumerable.SingleOrDefault<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)
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```
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## Ejemplo
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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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var purpleFruit = fruits.SingleOrDefault(f => f.Color == "Purple"); // Grape
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var greenFruit = fruits.SingleOrDefault(f => f.Color == "Green"); // null
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```
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