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动态修改工作流<第九篇>
一、动态添加或移除工作流活动
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(); } 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); } private void button2_Click(object sender, EventArgs e) { workflowInstance.ApplyWorkflowChanges(wfchange); workflowInstance.Start(); } }}
效果如下：
二、动态添加或移除容器活动
向工作流的容器类型复合活动中动态添加一个子活动。
添加一个Sequence容器，然后通过代码向其内部动态添加一个Code类型的子活动。
添加一个Winform程序，界面不变：
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); //创建一个Code活动 CodeActivity code1 = new CodeActivity("codeactivity1"); code1.ExecuteCode += delegate(object s, EventArgs ea) { MessageBox.Show("sequenceActivity里的Code工作流被调用!"); }; //添加工作流到容器中 SequenceActivity seq = (SequenceActivity)wfchange.TransientWorkflow.Activities["sequenceActivity1"]; seq.Activities.Add(code1); } //移除一个工作流 private void button3_Click(object sender, EventArgs e) { Activity Code1 = wfchange.TransientWorkflow.Activities["codeactivity1"]; SequenceActivity seq = (SequenceActivity)wfchange.TransientWorkflow.Activities["sequenceActivity1"]; seq.Activities.RemoveAt(0); } //执行 private void button2_Click(object sender, EventArgs e) { workflowInstance.ApplyWorkflowChanges(wfchange); workflowInstance.Start(); } }}
改动的部分就是红色部分代码，添加删除一个活动一样是Add、Remove。
动态修改工作流<第九篇>
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