从FileResult重定向到MVC的ActionResult

问题描述

这可能是一个简单的人，但这里有云：

This might be a simple one but here goes:

我实施我MVC3应用程序的Excel下载的报告。我用在过去此方法和它的工作完全，但是在这种情况下，有机会的销售数据可能没有针对报告存在。这里是我的code：

I'm implementing an excel downloadable report in my MVC3 application. I've used this method in the past and it's worked perfectly, however in this case, there is a chance that sales data may not exist for the report. Here is my code:

我有一个报告控制器内的FileResult动作：

I have a FileResult action within a Reports controller:

    [HttpPost]
    public FileResult ExcelReportDownload(ReportExcelDownloadRequest reportRequest)
    {
        ReportEngine re = new ReportEngine();

        Stream report = re.GetReport(reportRequest);

        return new FileStreamResult(report, "application/ms-excel")
        {
            FileDownloadName = "SalesReport.xls"
        };
    }

我的问题是，有时，报告流可以为空的意思，有没有销售信息可用，在这种情况下，我宁愿重定向到显示一条消息，说没有可用的销售信息视图，但我不知道如何实现这一点。

My issue is that sometimes the report stream may be null meaning that there's no sales info available, in which case I would rather redirect to a View that displays a message to say there is no sales information available, however I am not sure how to achieve this.

有没有办法做到这一点？

Is there a way to do this?

推荐答案

好了， FileResult 从的ActionResult 继承：

如果您导致可以是 RedirectToRouteResult （继承的ActionResult ）或 FileResult ，然后......你的行动必须是类型的ActionResult ，它可以同时管理。

If you result can be either a RedirectToRouteResult (inheriting from ActionResult) or a FileResult, then... your action must be of type ActionResult, which can manage both.

这样的事情：

    [HttpPost]
    public ActionResult ExcelReportDownload(ReportExcelDownloadRequest reportRequest)
    {
        ReportEngine re = new ReportEngine();

        Stream report = re.GetReport(reportRequest);
        if (report == null)
           return RedirectToAction(<action Name>);
        else
           return new FileStreamResult(report, "application/ms-excel")
           {
               FileDownloadName = "SalesReport.xls"
           };
    }

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