30 lines
994 B
Markdown
30 lines
994 B
Markdown
---
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title: First
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localeTitle: primero
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---
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# primero
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Devuelve el primer elemento que satisface una condición dada opcional. Si no se encuentra ningún elemento, lanza una `InvalidOperationException` ;
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### Firma
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```csharp
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Enumerable.First<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 firstFruit = fruits.First(); // Orange
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var firstYellowFruit = fruits.First(f => f.Color == "Yellow"); // Pineapple
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``` |