Roslyn Scripting Evaluate a Script with Parameters

When you need to send some information to a method, you can do it by passing the parameters, and parameters act as variables inside the method.

You can send parameters to the expression and use them in the script logic.

public class Point
{
    public int X;
    public int Y;
}

static async Task EvaluateWithParameters()
{
    var point = new Point { X = 3, Y = 5 };
    var result = await CSharpScript.EvaluateAsync<int>("X*2 + Y*2", globals: point);
    Console.WriteLine(result);
}

You can also create a script and execute it multiple times, as shown below.

static async Task EvaluateWithParameters1()
{
    var script = CSharpScript.Create<int>("X*Y", globalsType: typeof(Point));

    script.Compile();
    
    for (int i = 0; i < 10; i++)
    {
        var result = await script.RunAsync(new Point 
        { 
            X = i, 
            Y = i 
        });

        Console.WriteLine(result.ReturnValue);
    }
}

The CSharpScript.Create method creates a script, and then the RunAsync method executes that script multiple times in a `for loop.

You can also use the CreateDelegate method of a Script class to create a delegate to a script. The delegate doesn't hold compilation resources alive.

static async Task EvaluateWithParameters2()
{
    var script = CSharpScript.Create<int>("X*Y", globalsType: typeof(Point));

    ScriptRunner<int> runner = script.CreateDelegate();
    
    for (int i = 0; i< 10; i++)
    {
        var result = await runner(new Point
        {
            X = i,
            Y = i
        });

        Console.WriteLine(result);
    }
}