Create a function with CSharpScript and execute it

Question

Is it possible to define a function as a Script and then run it ?

I'm trying to achive something like that:

//defined in a namespace
public class Params{public string input { get; set; }}


string script = "string TryToUpper(string input){ return input.ToUpper(); }";
var v = CSharpScript.Create(script,  globalsType: typeof(Params) );

// what to do to execute TryToUpper and get "GIUSEPPE" back?
var val = v.RunAsync(???);

I am not sure this is possible with CSharpScript; what if you create an in-memory assembly (using Roslyn) with that function? Would that be an acceptable solution for your use case? — CoolBots
– CoolBots, Commented Oct 2, 2017 at 11:30
@CoolBots if that's easy to do yes :) My end-goal is to easily have some code snippets that my application can execute — gsharp
– gsharp, Commented Oct 2, 2017 at 11:40

Avo Nappo · Accepted Answer · 2017-10-02 11:47:09Z

3

You have to do two things in that script: first, define the function, then actually run it and return it's result. Like this:

public class Params
{
    public string input;
}

Params globals = new Params();
globals.input = "some lowercase text";

string script = "string TryUpper(string str) { return str.ToUpper(); } return TryUpper(input);";

string result = await CSharpScript.EvaluateAsync<string>(script, globals: globals);

answered Oct 2, 2017 at 11:47

Avo Nappo

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4 Comments

gsharp Over a year ago

I do not really understand why I have to call return TryUpper at the end, but it does what I want :) thanks!

CoolBots Over a year ago

Looks like the entire script is evaluated, and the result assigned to the string in the executing code. You can likely substitute the entire script with string script = "input.ToUpper()"; with the same effect.

Avo Nappo Over a year ago

Almost. You still need to actually return someting. so, you could replace it with string script = "return input.ToUpper();";

CoolBots Over a year ago

@Avo, I just tried it - works without return, but not with it.

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