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在C#工作流中實現(xiàn)條件分支可以使用條件分支活動(IfElseActivity)或Switch活動(SwitchActivity)來實現(xiàn)。以下是一個簡單的示例代碼:
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,我們創(chuàng)建了一個簡單的工作流,其中包含一個條件分支活動(IfElseActivity),根據(jù)一個隨機生成的條件執(zhí)行不同的代碼。條件的結(jié)果通過CodeActivity中的ConditionResult屬性設(shè)置,然后根據(jù)條件的結(jié)果執(zhí)行對應(yīng)的代碼。當(dāng)工作流執(zhí)行完成時,會觸發(fā)WorkflowCompleted事件;如果工作流終止,則會觸發(fā)WorkflowTerminated事件。
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