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

Code

Now

// Read-only property
public string FullName => FirstName + " " + LastName;

// 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

// Read-only property
public string FullName
{
    get { return FirstName + " " + LastName; }
}

// 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);
}

Notes

• The body must be a single expression, and for members with a return type its value is returned without needing return
• Support was extended to constructors, finalizers and get/set accessors with Expanded expression bodied members ^{C# 7.0}
• Unlike Lambda expressions ^{C# 3.0} there is no block-bodied form, use a normal {} body when you need multiple statements

More information

• Expression body definition (C# reference)