- 入门教程
- Join 运算符
- Set 运算符
- Generations 运算符
- LINQ Objects
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LINQ元素运算符
在LINQ中，元素运算符用于返回列表的第一个和最后一个元素，或者返回集合中的单个元素，或者基于集合中的索引值返回特定元素。
在LINQ中，我们有不同类型的元素运算符可用。这些是：
- First
- FirstOrDefault
- Last
- LastOrDefault
- ElementAt
- ElementAtOrDefault
- Single
- SingleOrDefualt
- DefaultfEmpty
通过使用这些元素运算符，我们可以获得特定位置的项目列表/集合。下表显示了与元素运算符相关的更详细信息。
| Operators | Description |
|---|---|
| First | It returns the first element in sequence or from the collection based on the condition. |
| FirstOrDefault | It is the same as First, but it returns the default value in case when no element is found in the collection. |
| Last | It returns the last element in sequence or the last element based on the matching criteria. |
| ElementAt | It returns an element from the list based on the specific index position. |
| ElementAtOrDefault | It is the same as ElementAt, but it returns the default value in case if no element is present at the specified index of the collection. |
| Single | It returns the single specific element from the collection. |
| SingleOrDefault | It is the same as Single, but it returns the default value in case if no element is found in the collection. |
| DefaultfEmpty | It returns the default value in case if the list or collection contains empty or null values. |
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