How to pass an argument into a workflow activity in code?

Question

I am using Windows Workflow Foundation 4.5.

I want to pass an argument into a WriteLine activity. Code as below:

class Program
{
    static void Main(string[] args)
    {
        WriteLine wf1 = new WriteLine();
        wf1.Text = "arg1";

        Dictionary<String, Object> arg = new Dictionary<String, Object>();
        arg.Add("arg1", "Hello,world!");

        WorkflowInvoker.Invoke(wf1, arg);
    }
}

But I get the following error at runtime:

Unhandled Exception: System.ArgumentException: The values provided for the root activity's arguments
 did not satisfy the root activity's requirements:
'WriteLine': The following keys from the input dictionary do not map to arguments and must be remove
d: arg1.  Please note that argument names are case sensitive.

So what's the correct way to do it?

Answer 1

The name of the argument is "Text". This will work:

class Program
{
    static void Main(string[] args)
    {
        WriteLine wf1 = new WriteLine();

        Dictionary<String, Object> arg = new Dictionary<String, Object>();
        arg.Add("Text", "Hello,world!");

        WorkflowInvoker.Invoke(wf1, arg);
    }
}