General Lambda syntax question

So I seem to be confident that the following 2 statements are the same

List<object> values = new List<object>();
values.ForEach(value => System.Diagnostics.Debug.WriteLine(value.ToString()));

AND

List<object> values = new List<object>();
values.ForEach((object value) => { 
    System.Diagnostics.Debug.WriteLine(value.ToString());
});

AND I know I can insert multiple lines of code in the second example like

List<object> values = new List<object>();
values.ForEach((object value) => { 
    System.Diagnostics.Debug.WriteLine(value.ToString());
    System.Diagnostics.Debug.WriteLine("Some other action");
});

BUT can you do the same thing in the first example? I can't seem to work out开发者_运维问答 a way.

---

Yes you can :)

        List<object> values = new List<object>();
        values.ForEach(value =>
                           {
                               System.Diagnostics.Debug.WriteLine(value.ToString());
                               System.Diagnostics.Debug.WriteLine("Some other action");
                           }

            );

---

This works fine:

values.ForEach(value =>
        { System.Diagnostics.Debug.WriteLine(value.ToString()); }
);

Maybe you forgot the ;

---

The only real difference between the first and the second is the { }. Add that to the first one and you can then add as many lines as you want. It isn't the (object value) that is allowing you to add multiple lines.

---

As others have shown, you can use a statement lambda (with braces) to do this:

parameter-list => { statements; }

However, it's worth noting that this has a restriction: you can't convert a statement lambda into an expression tree, only a delegate. So for example, this works:

Func<int> x = () => { return 5; };

But this doesn't:

Expression<Func<int>> y = () => { return 5; };