asp.net-mvc 使用响应流的 MVC 控制器
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MVC Controller Using Response Stream
提问by Neilski
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.
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。
In conventional ASP.net, I would have written something like:
在传统的 ASP.net 中，我会这样写：
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 ContentResultaction but it appears that I would need to create the result as a string, i.e.
我已经查看了ContentResult操作，但似乎我需要将结果创建为字符串，即
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.
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。
Could someone point me in the right direction? Thanks.
有人能指出我正确的方向吗？谢谢。
采纳答案by galets
I spent some time on the similar problem yesterday, and here's how to do it right way:
我昨天在类似的问题上花了一些时间，这是正确的方法：
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");
}
回答by Neilski
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:
我找到了解决此问题的一种可能方法。您可以简单地定义操作方法来返回一个 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();
}
This seems to work without any problems. Not sure how 'MVC' it is...
这似乎没有任何问题。不确定它是如何“MVC”的......
回答by Ofer Zelig
Try returning one the FileResults: http://msdn.microsoft.com/en-us/library/system.web.mvc.fileresult.aspx
尝试返回一个FileResults：http: //msdn.microsoft.com/en-us/library/system.web.mvc.fileresult.aspx
Also see this example: http://forums.asp.net/t/1491579.aspx/1
另请参阅此示例：http: //forums.asp.net/t/1491579.aspx/1
回答by cedd
Try something like this:
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);
}
