public override async Task <string> RunAsync(TaskContext context, string input)
{
JArray jArray = JArray.Parse(input);
int parameterCount = jArray.Count;
ParameterInfo[] methodParameters = MethodInfo.GetParameters();
if (methodParameters.Length < parameterCount)
{
throw new TaskFailureException(
"TaskActivity implementation cannot be invoked due to more than expected input parameters. Signature mismatch.");
}
var inputParameters = new object[methodParameters.Length];
for (int i = 0; i < methodParameters.Length; i++)
{
Type parameterType = methodParameters[i].ParameterType;
if (i < parameterCount)
{
JToken jToken = jArray[i];
var jValue = jToken as JValue;
if (jValue != null)
{
inputParameters[i] = jValue.ToObject(parameterType);
}
else
{
string serializedValue = jToken.ToString();
inputParameters[i] = DataConverter.Deserialize(serializedValue, parameterType);
}
}
else
{
if (methodParameters[i].HasDefaultValue)
{
inputParameters[i] = Type.Missing;
}
else
{
inputParameters[i] = parameterType.IsValueType ? Activator.CreateInstance(parameterType) : null;
}
}
}
string serializedReturn;
try
{
object invocationResult = InvokeActivity(inputParameters);
if (invocationResult is Task)
{
var invocationTask = invocationResult as Task;
if (MethodInfo.ReturnType.IsGenericType)
{
serializedReturn = DataConverter.Serialize(await((dynamic)invocationTask));
}
else
{
await invocationTask;
serializedReturn = string.Empty;
}
}
else
{
serializedReturn = DataConverter.Serialize(invocationResult);
}
}
catch (TargetInvocationException e)
{
Exception realException = e.InnerException ?? e;
string details = Utils.SerializeCause(realException, DataConverter);
throw new TaskFailureException(realException.Message, details);
}
catch (Exception e)
{
string details = Utils.SerializeCause(e, DataConverter);
throw new TaskFailureException(e.Message, details);
}
return(serializedReturn);
}
