27 lines
1021 B
Markdown
27 lines
1021 B
Markdown
|
---
|
||
|
title: First
|
||
|
localeTitle: أول
|
||
|
---
# أول
|
||
|
|
||
|
إرجاع العنصر الأول الذي يفي بشرط معين اختياري. في حالة عدم العثور على أي عنصر ، يتم عرض `InvalidOperationException` ،
|
||
|
|
||
|
### التوقيع
|
||
|
|
||
|
`Enumerable.First<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)
|
||
|
`
|
||
|
|
||
|
## مثال
|
||
|
|
||
|
`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 firstFruit = fruits.First(); // Orange
|
||
|
|
||
|
var firstYellowFruit = fruits.First(f => f.Color == "Yellow"); // Pineapple
|
||
|
`
|