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: =>
Func<Person, string> nameProjection = p => p.Name;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:
Func<Person, string> nameProjection = delegate (Person p) { return p.Name; };
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: =>
// 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();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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