.First vs. FirstOrDefault in LINQ: When to Use Which?

In the use of the use of .first and .firstOnstOnterfault in linq

When to use .first?

In the following cases, use Method:

.First You expect or confirm that the sequence contains at least one element.

The situation where the element does not exist is an abnormal situation that needs to be processed immediately.
• When to use .firtOnEfault?

In the following cases, use

Method:

You expect the sequence may be empty.

.FirstOrDefault You need to clearly check whether the element exists before performing further operation.

• .take method comparison
Methods are different from

Methods:

Returns a sequence containing a specified quantity element.

In the case of only the first element, you can use .Take to get it. .First

Actual application example
• .Take
For example, if you have a list of names, you need to retrieve the first matching name or handle the unsatisfactory situation, you can use
• : .Take(1)

On the contrary, if you always include at least one name, you can use

to directly retrieve the first element.

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