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c# - 从 byte[] 下载 PDF 文件

问题描述

我一直在努力从ASP.Net MVC C# 中PDF下载文件。bytes[]下面的代码工作正常。

我需要将代码转换.NET Core为相同的PDF下载过程。 

string fileName = "testFile.pdf";

byte[] pdfasBytes = Encoding.ASCII.GetBytes(fileBytes);   // Here the fileBytes are already encoded (Encrypt) value. Just convert from string to byte
Response.Clear();
MemoryStream ms = new MemoryStream(pdfasBytes);
Response.ContentType = "application/pdf";
Response.Headers.Add("content-disposition", "attachment;filename=" + fileName);
Response.Buffer = true;
ms.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();

我试图将上面的代码转换为.NET Core. 我收到一个错误：OutputStream方法不包含此 ms.WriteTo(Response.OutputStream)行的响应。提前致谢。！

标签： c#asp.net-core-2.0

解决方案

@Luaan 先生已经给出了答案，但可能我的代码也对你有帮助，所以我分享一下。

从文件夹下载PDF文件

[HttpGet]
        public FileStreamResult DownloadPdfFile(string fileName)
        {            
            var stream = new FileStream(Directory.GetCurrentDirectory() + "\\wwwroot\\WriteReadData\\" + fileName, FileMode.Open);
            return new FileStreamResult(stream, "application/pdf");
        }

从数据库下载pdf文件

[HttpGet]
        public FileStreamResult DownloadFileFromDataBase(string id)
        {
            var _fileUpload = _db.FileUpload.SingleOrDefault(aa => aa.fileid == id);         // _fileUpload.FileContent type is byte
            MemoryStream ms = new MemoryStream(_fileUpload.FileContent);
            return new FileStreamResult(ms, "application/pdf");
        }

For more info please also see this question and answer. Return PDF to the Browser using Asp.net core

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