I've been trying for long but can't seem to figure out the solution.
A function that takes a string and returns an object of type IVehicle.
Method Signature
public class Car: IVehicle
{
public static IVehicle GetCar(Func<string, IVehicle> lambda)
{
//...
}
Method Call
Car.GetCar("lambo" => new Car("lambo"));
Question:
What changes can I do to my call to be compatible with the method signature?
Targeting .NET Framework 4.5.1
GetCar needs a method which takes a string and returns a type which implements IVehicle.
Therefore, you need to provide a method like below:
Car.GetCar(x => new Car(x));
Here is a longer version, without lambda, to explain what is going on there:
Car.GetCar(CallThisMethod);
// See the signature of this method: it takes a string and returns IVehicle
public static IVehicle CallThisMethod(string someString)
{
return new Car();
}
As @odingYoshi suggested you need to change it so that the Func takes in a variable and uses that one:
Car.GetCar(x => new Car(x));
If you need to pass in the variable x, you could hardcode it in the Func:
Car.GetCar(x => new Car("lambo"));
However, if you need to do that you probably shouldn't be using a Func at all:
public static IVehicle GetCar(string carName)
{
IVehicle car = new Car(carName);
//Anything extra
}
Another alternative is to pass the string into the method as well:
public static IVehicle GetCar(Func<string, IVehicle> lambda, string carName)
{
IVehicle car = lambda(carName);
//Anything extra
}
x => new Car(x)is shorthand for(string x) => new Car(x), makes it easier to see why you can't substitute"lambo"forx.