How Can C#'s Lambda Operator Simplify Delegate Creation and Expression-Bodied Members?

In-depth understanding of the Lambda operator in C#

The Lambda operator ("=>") in C# is a powerful syntactic sugar that simplifies the creation of anonymous delegates and expression bodies.

Lambda expression

Lambda expressions provide a cleaner alternative to anonymous methods without explicitly declaring a delegate. They are typically used as Lambda parameters of delegate types, such as Func<T, TResult> or Action<T>.

For example, create a delegate that returns a person’s name:

Traditional commission writing method:

<code class="language-csharp">Func<Person, string> nameProjection = delegate (Person p) { return p.Name; };</code>

Simplified using Lambda syntax:

<code class="language-csharp">Func<Person, string> nameProjection = p => p.Name;</code>

Expression body members

Starting in C# 6, Lambda syntax is extended to support expression body members for properties and methods. This allows the implementation of a property or method to be defined using simplified expressions without using traditional code blocks.

For example, define a IsValid attribute to check whether the person's name is not empty and the ID is not -1:

<code class="language-csharp">public int IsValid => name != null && id != -1;</code>

Similarly, the GetHashCode method can be implemented using Lambda syntax:

<code class="language-csharp">public int GetHashCode() => id.GetHashCode();</code>

More learning resources

Deep Learning:

• What is the difference between anonymous methods and Lambda expressions?
• What is a Lambda expression?
• Why should you use Lambda expressions in C#?

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