Andrew Zhu | Xhinker

Use Try Catch activity in the pure C# way. First, Create a workflow with Try-Catch in pure C# code:

using System;
using System.Activities;
using System.Activities.Statements;
namespace ErrorHandling {
    public class ErrorHandlingWorkflow{
        public Activity GetInstance() {
            Variable<int> divisor = new Variable<int>("divisor", 10);
            Variable<int> dividend = new Variable<int>("dividend", 0);            
            Variable<int> result = new Variable<int>("result");
            DelegateInArgument<DivideByZeroException> eia = 
               new DelegateInArgument<DivideByZeroException>();
            Activity workflow = new Sequence() {
                Variables = { divisor, dividend, result },
                Activities ={
                    new TryCatch{
                        Try=new Assign{
                            To=new OutArgument<int>(result),
                            Value=new InArgument<int>(
                                aec=>divisor.Get(aec)/dividend.Get(aec)
                            )
                        },
                        Catches={
                            new Catch<DivideByZeroException>{
                                Action=
                                new ActivityAction<DivideByZeroException>{
                                    Argument=eia,
                                    Handler=new Sequence{
                                        Activities={
                                            new WriteLine{
                                                Text="Divide By Zero Exception"
                                            },
                                        }
                                    }
                                },
                            }
                        },
                        Finally=new WriteLine{Text="finally,calculation done"}
                    }
                }
            };
            return workflow;
        }
    }
}

Then, Call it in Main method:

using System.Activities;
namespace ErrorHandling {
    class Program {
        static void Main(string[] args) {
            ErrorHandlingWorkflow errorHandlingWorkflow=
                new ErrorHandlingWorkflow();
            WorkflowInvoker.Invoke(errorHandlingWorkflow.GetInstance());
        }
    }
}

Result:

WF4