System.Linq.Expressions.Expression.Catch C# (CSharp) Method

        public static CatchBlock Catch(ParameterExpression variable, Expression body)
        {
            ContractUtils.RequiresNotNull(variable, nameof(variable));
            return MakeCatchBlock(variable.Type, variable, body, filter: null);
        }

        public EvaluationCallback Create(Node node)
        {
            var compilerstate = new CompilerState
            {
                FunctionState = Exp.Parameter(typeof(Character), "state"),
                ErrorVariable = Exp.Parameter(typeof(bool), "error")
            };
            var result = Make(compilerstate, node);

            if (result.Type == typeof(bool))
            {
                result = ToInteger(result);
            }
            if (result.Type == typeof(int) || result.Type == typeof(float))
            {
                // int or float convert to number
                var constructor = typeof(Number).GetConstructor(new[] { result.Type });
                result = Exp.New(constructor, new[] { result });

                // wrap the evaluation in a try..catch
                var exceptionParameter = Exp.Parameter(typeof(Exception), "e");
                var writeLineMethod    = typeof(Console).GetMethod(nameof(Console.WriteLine), new Type[] { typeof(string) });
                var toStringMethod     = typeof(Exception).GetMethod(nameof(Exception.ToString));
                var catchBody          = Exp.Block(
                    Exp.Call(null, writeLineMethod, Exp.Call(exceptionParameter, toStringMethod)),
                    Exp.Constant(new Number(0)));
                result = Exp.TryCatch(result, Exp.Catch(exceptionParameter, catchBody));
                // create lambda
                var func = Exp.Lambda <Func <Character, bool, Number> >(result, compilerstate.FunctionState, compilerstate.ErrorVariable).Compile();
                return(new EvaluationCallback(o => func(o, false)));
            }
            throw new Exception();
        }