You can create arguments to workflow and can pass the values from outside. For creating arguments, you can use the Arguments Tab in the WorkFlow designer.

In the last post I mentioned about loading and invoking a WorkFlow, the WorkFlowInvoker class’s Invoke method has an overload, which accepts inputs parameter, which is type of IDictionary<string, object>. You can create an Dictionary<string, object> and pass it as the parameter to the Invoke method.

You can get the results from the WorkFlow in similar fashion, it is also returning IDictionary<string, object>. Here is the code snippet, which provides one input parameter and accepts the results.

var inputParameters = new Dictionary<string, object>();
inputParameters.Add("CurrentDate", DateTime.Now.AddDays(-20));
var result = WorkflowInvoker.Invoke(activity, inputParameters);
object timeAgo = string.Empty;
if (result.TryGetValue("Result", out timeAgo))
{
    Console.WriteLine(timeAgo);
}

You can use any type as the argument type.

Happy Coding :)