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在C#工作流中实现条件分支可以使用条件分支活动(IfElseActivity)或Switch活动(SwitchActivity)来实现。以下是一个简单的示例代码:
using System;
using System.Workflow.Activities;
namespace ConditionalWorkflow
{
class Program
{
static void Main(string[] args)
{
WorkflowRuntime workflowRuntime = new WorkflowRuntime();
IfElseActivity ifElseActivity = new IfElseActivity();
CodeActivity conditionActivity = new CodeActivity();
conditionActivity.ExecuteCode += new EventHandler(conditionActivity_ExecuteCode);
ifElseActivity.Activities.Add(conditionActivity);
CodeActivity trueActivity = new CodeActivity();
trueActivity.ExecuteCode += new EventHandler(trueActivity_ExecuteCode);
ifElseActivity.ThenActivities.Add(trueActivity);
CodeActivity falseActivity = new CodeActivity();
falseActivity.ExecuteCode += new EventHandler(falseActivity_ExecuteCode);
ifElseActivity.ElseActivities.Add(falseActivity);
SequentialWorkflowActivity workflow = new SequentialWorkflowActivity();
workflow.Activities.Add(ifElseActivity);
workflowRuntime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(workflowRuntime_WorkflowCompleted);
workflowRuntime.WorkflowTerminated += new EventHandler<WorkflowTerminatedEventArgs>(workflowRuntime_WorkflowTerminated);
workflowRuntime.CreateWorkflow(workflow).Start();
Console.ReadLine();
}
static void conditionActivity_ExecuteCode(object sender, EventArgs e)
{
Console.WriteLine("Checking condition...");
// Simulate a condition
Random random = new Random();
bool condition = random.Next(0, 2) == 1;
((CodeActivity)sender).WorkflowExecutionContext.ConditionResult = condition;
}
static void trueActivity_ExecuteCode(object sender, EventArgs e)
{
Console.WriteLine("Condition is true");
}
static void falseActivity_ExecuteCode(object sender, EventArgs e)
{
Console.WriteLine("Condition is false");
}
static void workflowRuntime_WorkflowCompleted(object sender, WorkflowCompletedEventArgs e)
{
Console.WriteLine("Workflow completed");
}
static void workflowRuntime_WorkflowTerminated(object sender, WorkflowTerminatedEventArgs e)
{
Console.WriteLine("Workflow terminated");
}
}
}
在上面的示例中,我们创建了一个简单的工作流,其中包含一个条件分支活动(IfElseActivity),根据一个随机生成的条件执行不同的代码。条件的结果通过CodeActivity中的ConditionResult属性设置,然后根据条件的结果执行对应的代码。当工作流执行完成时,会触发WorkflowCompleted事件;如果工作流终止,则会触发WorkflowTerminated事件。
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