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C# switch in lambda expression

Is it possible to have a switch in a lambda expression? If not, why? Resharper displays it as an error.

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Toto Avatar asked Sep 16 '09 13:09

Toto


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1 Answers

You can in a statement block lambda:

Action<int> action = x =>
{
  switch(x)
  {
    case 0: Console.WriteLine("0"); break;
    default: Console.WriteLine("Not 0"); break;
  }
};

But you can't do it in a "single expression lambda", so this is invalid:

// This won't work
Expression<Func<int, int>> action = x =>
  switch(x)
  {
    case 0: return 0;
    default: return x + 1;
  };

This means you can't use switch in an expression tree (at least as generated by the C# compiler; I believe .NET 4.0 at least has support for it in the libraries).

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Jon Skeet Avatar answered Nov 16 '22 01:11

Jon Skeet