Assigning function invocation to anonymous field in c#

Question

I am returning anonymous type from my linq query:

select new {
Exists = true,
Code = new Func<string,string>((string param) => {
                                      if (param == "T")
                                          return "Tab";
                                      if (param == "E")
                                          return "Eub";
                                      if (param == "C")
                                          return "GTW";
                                      if (param == "X")
                                          return "XUX";
                                      return "";
}
}

An error:

A lambda expression with a statement body cannot be converted to an expression tree

is being thrown but it does not tell me anything.

Question: How to handle that without creating new nonanonymous function?

Answer 1

Why use Func<string,string> ?

something.Select(x => new {
Exists = true,
Code = x.param == "T" ? "Tab" :
       x.param == "E" ? "Eub" :
       x.param == "C" ? "GTW" :
       x.param == "X" ? "XUX" : ""
});