Linq: assign variables in Lambda expressions

Question

when using the "from.. select" form I can assign local variables in Linq with the let statement. How to capture variables with lambdas? Non working example of what I need:

var result = list.Select(a =>
    let localVariable = a.number + 2 // <- obviously non working
    new {
        Variable = localVariable 
    }
);

Atanas Korchev · Accepted Answer · 2011-03-03 09:54:34Z

17

This should work:

var result = list.Select(a =>
  {
    var localVariable = a.number + 2;
    return new 
    {
        Variable = localVariable 
    };
  }
);

edited Mar 3, 2011 at 9:54

answered Mar 3, 2011 at 9:47

Atanas Korchev

30.6k8 gold badges62 silver badges94 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Will Over a year ago

+1 Yep, just stick a ; on the end of "var localVariable = a.number + 2"

pistacchio Over a year ago

thanks i think this is what i'm looking for, but i get the following error: A lambda expression with a statement body cannot be converted to an expression tree

CodesInChaos Over a year ago

You didn't state you were using Linq on an IQueryable. What provider are you using? EF? Linq-to-sql? Or something else?

Collectives™ on Stack Overflow

Linq: assign variables in Lambda expressions

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related