What does the `=>` operator mean in C#?

In-depth understanding of the Lambda operator (=>) in C#

Question:

What does the

syntax in C# stand for? =>

Answer: The

syntax represents the Lambda operator. This operator was introduced in C# 3 and has multiple uses. =>

Lambda expression (C# 3-5):

In this context,

is used to create Lambda expressions. These expressions are a concise form of anonymous methods, allowing you to write anonymous functions as a single expression. For example: =>

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

This code creates a delegate that accepts a Person parameter and returns its name as a string. It is equivalent to the following anonymous method:

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

Expression body member (C# 6):

In C# 6, the same

syntax is used for expression body members. These are properties or methods whose bodies are defined as expressions rather than blocks of code. For example: =>

<code class="language-csharp">// 表达式主体属性
public int IsValid => name != null && id != -1;

// 表达式主体方法
public int GetHashCode() => id.GetHashCode();</code>

These features provide syntactic sugar for writing cleaner, more expressive code.

More resources:

• Difference between anonymous methods and Lambda expressions
• What is a Lambda expression?
• C# Lambda expression, why should I use it?

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