Error with implicitly typed variables

Question

When assigning a linq choice to the implicitly typed local variable "var", I get the following error.

Error :Cannot assign method group to an implicitly-typed local variable

in

root : var mailgroup = emails.Where(p =>IsValidFormat(p.Value)).Select;

Dictionary of Elements

        Dictionary<int, string> emails = new Dictionary<int, string>();
        emails.Add(1, "[e-mail]");
        emails.Add(2, "[e-mail]");
        emails.Add(3, "Rose");
        emails.Add(4, "Ana");
        emails.Add(5, "[e-mail]");
        Dictionary<int, string> dc = new Dictionary<int, string>();

How to fix it?

Answer 1

What do you expect from this? You probably want to make an actual method call, for example:

var mailgroup = emails.Where(p =>IsValidFormat(p.Value))
                      .Select(p => p.Value);

Or, if you just need key / value pairs, you can simply use:

var mailgroup = emails.Where(p =>IsValidFormat(p.Value));

and completely remove the "Select".

If you just need the values ​​(according to the first code snippet), I would suggest using:

var mailgroup = emails.Values.Where(p =>IsValidFormat(p));

Without any brackets, your “Select” link is a group of methods — what you convert to a delegate, for example.

Func<int> x = SomeMethod; // Where SomeMethod is declared as "int SomeMethod()"

Select , ...

Answer 2

() Select. , , , Select, " ".

, , , , .Select() .