Expression-bodied methods in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an expression-bodied method in C#?

An expression-bodied method is a concise way to write methods using the => syntax to return a single expression instead of a full block with braces.

beginner

Rewrite this method using expression-bodied syntax:<br>

int Square(int x) { return x * x; }

int Square(int x) => x * x;

beginner

Can expression-bodied methods have multiple statements inside?

No, expression-bodied methods can only have a single expression. For multiple statements, use the regular method body with braces.

intermediate

How do expression-bodied methods improve code readability?

They make simple methods shorter and clearer by removing unnecessary braces and return keywords, making the code easier to read and write.

intermediate

Which C# version introduced expression-bodied methods?

Expression-bodied methods were introduced in C# 6.0.

Which symbol is used to define an expression-bodied method in C#?

A ->

B =>=

C ::

D =>

Expression-bodied methods use the lambda arrow => to define the method body as a single expression.

Can an expression-bodied method contain multiple statements?

A Yes, with semicolons separating them

B No, only a single expression is allowed

C Yes, if enclosed in parentheses

D Only if marked async

Expression-bodied methods only allow a single expression, not multiple statements.

What is the benefit of using expression-bodied methods?

A They allow multiple return values

B They enable method overloading

C They make code shorter and more readable for simple methods

D They improve runtime performance

Expression-bodied methods simplify code by making simple methods shorter and easier to read.

Which C# version first introduced expression-bodied methods?

A C# 6.0

B C# 5.0

C C# 7.0

D C# 8.0

Expression-bodied methods were introduced in C# 6.0.

How would you convert this method to expression-bodied syntax?<br>

string GetName() { return "Alice"; }

A string GetName() => "Alice";

B string GetName() => { return "Alice"; };

C string GetName() => return "Alice";

D string GetName() => { "Alice"; };

The correct expression-bodied syntax uses => followed by the expression without braces or return keyword.

Explain what expression-bodied methods are and when you would use them.

Think about how to write short methods more clearly.

Show how to convert a normal method with a return statement into an expression-bodied method.

Focus on replacing the method body with a single expression.