一、动态添加或移除活动

　　首先添加一个顺序的空白工作流。

　　然后添加一个Winform程序，界面如下：

　　代码如下：

namespace WinForm
{
    public partial class Form1 : Form
    {
        private WorkflowRuntime workflowRuntime = null;
        private WorkflowInstance workflowInstance = null;
        private WorkflowChanges wfchange = null;

        public Form1()
        {
            InitializeComponent();
            workflowRuntime = new WorkflowRuntime();
            workflowRuntime.StartRuntime();
        }

        //添加一个工作流
        private void button1_Click(object sender, EventArgs e)
        {
            Type type = typeof(WorkflowConsoleApplication1.Workflow1);
            workflowInstance = workflowRuntime.CreateWorkflow(type);
            Activity Act = workflowInstance.GetWorkflowDefinition();
            wfchange = new WorkflowChanges(Act);

            CodeActivity code1 = new CodeActivity("codeactivity1");
            code1.ExecuteCode += delegate(object s, EventArgs ea)
            {
                MessageBox.Show("工作流被调用!");
            };
            wfchange.TransientWorkflow.Activities.Insert(0, code1);
        }

        //移除一个工作流
        private void button3_Click(object sender, EventArgs e)
        {
            Activity Code1 = wfchange.TransientWorkflow.Activities["codeactivity1"];
            wfchange.TransientWorkflow.Activities.Remove(Code1);
        }

        //执行
        private void button2_Click(object sender, EventArgs e)
        {
            workflowInstance.ApplyWorkflowChanges(wfchange);
            workflowInstance.Start();
        }
    }
}

　　效果如下：

　　点击"添加Code"后，再执行，Code1活动会被执行。

　　如果点击"添加Code"再点击"移除Code"，那么不会弹出任何提示框。