The element operators are used to return a single, or a specific element from the sequence or collection. For example, in a school when we ask, who is the principal? Then there will be only one person that will be the principal of the school. So the number of students is a collection and the principal is the only result that comes from the collection.
The LINQ Standard Query Operator supports 8 types of element operators:
The First operator is used to return the first element of the given collection or sequence. Or it can also return the first element according to the given condition. This method can be overloaded in two different ways:
- First<TSource>(IEnumerable<TSource>): This method returns the first element of the given sequence or collection without any condition.
- First<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>): This method returns the first element which specifies the given condition.
- It does not support query syntax in C# and VB.Net languages.
- It support method syntax in both C# and VB.Net languages.
- It present in both the Queryable and Enumerable class.
- If the given collection or sequence does not contain any element in it, then this method will throw an InvalidOperationException.
- It will throw an error if the given collection or sequence does not contain any element that satisfies the given condition or it contains null.
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