What Does the `>=` Symbol Mean in C# Lambda Expressions?

Deeply explore the meaning and usage of the => symbol in C#

In C#, the => symbol represents the Lambda expression operator, a powerful feature introduced in C# 3 and improved in subsequent versions.

Lambda expression: simplified anonymous method

Lambda expressions are a concise way to define anonymous methods, which were introduced in C# 2. They provide a cleaner, more readable way to pass delegates inline. Consider the following example:

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

This Lambda expression is equivalent to the following anonymous method:

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

Both forms create a delegate that takes a Person parameter and returns the person's name.

Expression body members in C# 6 and above

In C# 6, Lambda syntax is expanded to include expression body members. These members allow for single-line implementation of properties and methods as follows:

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

Understanding Lambda Operators

The

Lambda operator (=>) takes the form:

<code>parameter => expression</code>

Among them:

• parameter is the input parameter of the Lambda expression.
• expression is the code that is executed when the Lambda expression is called.

Example of Lambda usage

Lambda is commonly used in various scenarios, including:

• Passed as delegate to other methods and events
• Filter and transform data in LINQ (Language Integrated Query)
• As part of an expression tree for performance optimization

Related Resources

To learn more about lambda expressions and expression body members, consider the following resources:

• C# Lambda Expression Documentation
• Expression body members
• Anonymous methods and Lambda expressions

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