我有私有方法,它尝试生成pdf文件,然后发送带有此pdf的电子邮件。如果一切正常,则此方法将表单上的文本更改为"已成功生成 PDF"。
我的方法 :
private void RegenerateSubmissionPdf(int submissionId)
{
var submissionPath = PublisherConfigurationManager.SubmissionPath + submissionId;
var tasks = new List<Task>
{
HttpContext.Current.GeneratePdfTask(submissionPath, submissionId, PublisherConst.SubmissionPdfName,
_objSubmission.SaveSubmissionPdf)
};
tasks.SendEmailTasks(u => SendRegenerateSubmissionPdfEmail(submissionId, u));
}
和返回Task
的方法:
public static Task GeneratePdfTask(this HttpContext context, string path, int submissionId, string pdfName, Action<int, byte[]> postAction = null)
{
var local = context;
return Task.Factory.StartNew(() =>
{
HttpContext.Current = local;
SessionHelper.Set(SessionKey.IsPdfRendering, true);
var pdfFile = new PdfGenerator().Generate(path, pdfName, submissionId);
if (postAction != null && pdfFile != null)
{
postAction(submissionId, pdfFile);
}
});
}
在最后一种方法中,有时我遇到异常(可能是路径错误,某些图像丢失或其他内容)。我找到了这个解决方案,但不知道如何将其应用于我的情况。
你试过这个吗:
private void RegenerateSubmissionPdf(int submissionId)
{
var submissionPath = PublisherConfigurationManager.SubmissionPath + submissionId;
var tasks = new List<Task>
{
HttpContext.Current.GeneratePdfTask(submissionPath, submissionId, PublisherConst.SubmissionPdfName,
_objSubmission.SaveSubmissionPdf)
};
tasks.ForEach(t => t.ContinueWith(ExceptionHandler, TaskContinuationOptions.OnlyOnFaulted));
tasks.SendEmailTasks(u => SendRegenerateSubmissionPdfEmail(submissionId, u));
}
private void ExceptionHandler(Task task)
{
// Handle exception
}
创建并启动列表中的任务后,您可以为每个任务分配一个延续,以防引发异常。但是根据您的代码,我看不到需要任务列表。您可以简单地使用任务对象并为其分配延续。
据我了解,SendEmailTasks
是一种扩展方法,但您可以简单地使用一个任务,如下所示:
private void RegenerateSubmissionPdf(int submissionId)
{
var submissionPath = PublisherConfigurationManager.SubmissionPath + submissionId;
var task = HttpContext.Current.GeneratePdfTask(submissionPath, submissionId, PublisherConst.SubmissionPdfName,
_objSubmission.SaveSubmissionPdf);
task.ContinueWith(t =>
SendRegenerateSubmissionPdfEmail(submissionId, task),
TaskContinuationOptions.OnlyOnRanToCompletion);
task.ContinueWith(t =>
HandleException(task.Exception),
TaskContinuationOptions.OnlyOnFaulted);
await task;
}
如果没有异常,此方法将继续执行,如果有异常,则处理异常。并考虑使用await
结构或Run
方法而不是StartNew
(Stephen Cleary关于此的好文章)。