使用响应流的 MVC 控制器

发布于 2024-12-01 03:51:37 字数 494 浏览 2 评论 0原文

我正在使用 MVC 3，我想动态创建一个 CSV 文件以供下载，但我不确定正确的面向 MVC 的方法。

在传统的 ASP.net 中，我会编写如下内容：

Response.ClearHeaders();
Response.ContentType = "text/csv";
Response.AddHeader("content-disposition", attachment;filename='Test.csv'");
Response.Write("1,2,3");
Response.End();

我已经查看了 ContentResult 操作，但看来我需要将结果创建为字符串，即

return Content(myData, "text/csv");

我想，我可以构建一个字符串，但由于这些文件可能有几千行长，这对我来说似乎效率低下。

有人能指出我正确的方向吗？谢谢。

原文

I'm using MVC 3 I would like to dynamically create a CSV file for download, but I am unsure as to the correct MVC orientated approach.

In conventional ASP.net, I would have written something like:

Response.ClearHeaders();
Response.ContentType = "text/csv";
Response.AddHeader("content-disposition", attachment;filename='Test.csv'");
Response.Write("1,2,3");
Response.End();

I have looked at the ContentResult action but it appears that I would need to create the result as a string, i.e.

return Content(myData, "text/csv");

I could, I suppose, build a string, but since these files could be several thousand lines long, this seems inefficient to me.

Could someone point me in the right direction? Thanks.

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神回复 2024-12-08 03:51:37

我找到了解决这个问题的一个可能的方法。您可以简单地定义操作方法来返回 EmptyResult() 并直接写入响应流。例如：

public ActionResult RobotsText() {
    Response.ContentType = "text/plain";
    Response.Write("User-agent: *\r\nAllow: /");
    return new EmptyResult();
}

这似乎工作没有任何问题。不知道它是如何“MVC”......

I have found one possible solution to this problem. You can simply define the action method to return an EmptyResult() and write directly to the response stream. For example:

public ActionResult RobotsText() {
    Response.ContentType = "text/plain";
    Response.Write("User-agent: *\r\nAllow: /");
    return new EmptyResult();
}

This seems to work without any problems. Not sure how 'MVC' it is...

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铁轨上的流浪者 2024-12-08 03:51:37

我昨天花了一些时间来解决类似的问题，以下是正确的解决方法：

public ActionResult CreateReport()
{
    var reportData = MyGetDataFunction();
    var serverPipe = new AnonymousPipeServerStream(PipeDirection.Out);
    Task.Run(() => 
    {
        using (serverPipe)
        {
             MyWriteDataToFile(reportData, serverPipe)
        }
    });

    var clientPipe = new AnonymousPipeClientStream(PipeDirection.In,
             serverPipe.ClientSafePipeHandle);
    return new FileStreamResult(clientPipe, "text/csv");
}

I spent some time on the similar problem yesterday, and here's how to do it right way:

public ActionResult CreateReport()
{
    var reportData = MyGetDataFunction();
    var serverPipe = new AnonymousPipeServerStream(PipeDirection.Out);
    Task.Run(() => 
    {
        using (serverPipe)
        {
             MyWriteDataToFile(reportData, serverPipe)
        }
    });

    var clientPipe = new AnonymousPipeClientStream(PipeDirection.In,
             serverPipe.ClientSafePipeHandle);
    return new FileStreamResult(clientPipe, "text/csv");
}

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忆梦 2024-12-08 03:51:37

尝试返回一个 FileResult：http://msdn.microsoft.com/en-us/library/system.web.mvc.fileresult.aspx

另请参阅此示例：http://forums.asp.net/t/1491579.aspx/1

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究竟谁懂我的在乎 2024-12-08 03:51:37

尝试这样的事情：

public ActionResult CreateReport(string report, string writer)
{
    var stream = new MemoryStream();
    var streamWriter = new StreamWriter(stream);

    _generateReport.GenerateReport(report, writer);

    streamWriter.Flush();
    stream.Seek(0, SeekOrigin.Begin);

    return new FileStreamResult(stream, writer.MimeType);
}

Try something like this:

public ActionResult CreateReport(string report, string writer)
{
    var stream = new MemoryStream();
    var streamWriter = new StreamWriter(stream);

    _generateReport.GenerateReport(report, writer);

    streamWriter.Flush();
    stream.Seek(0, SeekOrigin.Begin);

    return new FileStreamResult(stream, writer.MimeType);
}

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