MethodDeclaration Class

var method = new MethodDeclaration("Calculate");
method.Modifiers = Modifiers.Public;
method.ReturnType = typeof(int);
method.Arguments.Add(new MethodArgumentDeclaration(typeof(int), "value"));
method.Statements = new ReturnStatement(new LiteralExpression(42));

Assert.Equal("""
    public int Calculate(int value)
    {
        return 42;
    }

    """, method.ToCsharpString());