How to get max value of a column using Entity Framework?

Question

To get maximum value of a column that contains integer, I can use the following T-SQL comand

SELECT MAX(expression )
FROM tables
WHERE predicates;


        

Answer 1

In VB.Net it would be

Dim maxAge As Integer = context.Persons.Max(Function(p) p.Age)

Answer 2

Try this int maxAge = context.Persons.Max(p => p.Age);

And make sure you have using System.Linq; at the top of your file

Answer 3

Maybe help, if you want to add some filter:

context.Persons
.Where(c => c.state == myState)
.Select(c => c.age)
.DefaultIfEmpty(0)
.Max();

Answer 4

As many said - this version

int maxAge = context.Persons.Max(p => p.Age);

throws an exception when table is empty.

Use

int maxAge = context.Persons.Max(x => (int?)x.Age) ?? 0;

or

int maxAge = context.Persons.Select(x => x.Age).DefaultIfEmpty(0).Max()