The rise of the lambda "goes-to" operator => has seen a surge in a variety of languages and now C# 6.0 allows members to be defined with this syntax instead of the traditional {} block.

Code

Now

// Takes and returns a value
public string GetPostExcerpt(Post p)
    => string.Join(' ', p.Body.Split(' ').Take(25)) + " ...";

// No return type
public void StartCache() => cache.Start(this, cachePolicy);

Before

// Takes and returns a value
public string GetPostExcerpt(Post p) {
    return string.Join(' ', p.Body.Split(' ').Take(25)) + " ...";
}

// No return type
public void StartCache()
{
    cache.Start(this, cachePolicy);
}

Note

• return is automatically implied for any member with a return type and only a single statement
• Support was extended to constructors, properties, finalizers and indexers with Expanded expression bodied members ^{C# 7.0}
• Unlike Lambda expressions ^{C# 3.0} multi-line operations are not permitted
  • There would be little point as it would be longer as unlike JavaScript C# does not use the function keyword

More information

• C# Programming Guide