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该文件来自Azure Files共享,但它可以是包含二进制文件的任何流.
在我看来,MVC序列化响应对象,并返回结果JSON,而不是返回响应对象本身.
这是我的控制器方法:
[HttpGet] [Route("GetFile")] public HttpResponseMessage GetFile(string Username,string Password,string FullName) { var client = new AzureFilesClient.AzureFilesClient(Username,Password); Stream azureFileStream = client.GetFileStream(FullName).Result; var fileName = Path.GetFileName(FullName); using (HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK)) { response.Content = new StreamContent(azureFileStream); response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = fileName }; return response; } }
AzureFilesClient上的GetFileStream方法在此处,但流源可以是包含二进制文件内容的任何内容:
public async Task<Stream> GetFileStream(string fileName) { var uri = new Uri(share.Uri + "/" + fileName); var file = new CloudFile(uri,credentials); using (var stream = new MemoryStream()) { await file.DownloadToStreamAsync(stream); stream.Seek(0,SeekOrigin.Begin); return stream; } }
编辑:以下是JSON响应的示例:
{ "Version": { "Major": 1,"Minor": 1,"Build": -1,"Revision": -1,"MajorRevision": -1,"MinorRevision": -1 },"Content": { "Headers": [ { "Key": "Content-Type","Value": [ "application/octet-stream" ] },{ "Key": "Content-Disposition","Value": [ "attachmentx; filename=\"samplefile.docx\"" ] } ] },"StatusCode": 200,"ReasonPhrase": "OK","Headers": [],"RequestMessage": null,"IsSuccessStatusCode": true }
Azure部分是使用nuGet包“WindowsAzure.Storage”(4.4.1预览版)制作的
首先是获得JSON序列化的输出.
这需要返回自定义操作结果.
using Microsoft.AspNet.Mvc; using System.IO; using System.Threading.Tasks; public class FileResultFromStream : ActionResult { public FileResultFromStream(string fileDownloadName,Stream fileStream,string contentType) { FileDownloadName = fileDownloadName; FileStream = fileStream; ContentType = contentType; } public string ContentType { get; private set; } public string FileDownloadName { get; private set; } public Stream FileStream { get; private set; } public async override Task ExecuteResultAsync(ActionContext context) { var response = context.HttpContext.Response; response.ContentType = ContentType; context.HttpContext.Response.Headers.Add("Content-Disposition",new[] { "attachment; filename=" + FileDownloadName }); await FileStream.CopyToAsync(context.HttpContext.Response.Body); } }
现在获取从Azure文件共享(或任何其他异步流源)流式传输的二进制数据
using Microsoft.WindowsAzure.Storage; using Microsoft.WindowsAzure.Storage.Auth; using Microsoft.WindowsAzure.Storage.File; using System; using System.Collections.Generic; using System.IO; using System.Text; using System.Threading.Tasks; public async Task<Stream> GetFileStreamAsync(string fileName) { var uri = new Uri(share.Uri + "/" + fileName); var file = new CloudFile(uri,credentials); // Note: Do not wrap the stream variable in a Using,since it will close the stream too soon. var stream = new MemoryStream(); await file.DownloadToStreamAsync(stream); stream.Seek(0,SeekOrigin.Begin); return stream; }
最后是控制器代码.注意使用IActionResult接口.
[HttpGet] [Route("GetFile")] public async Task<IActionResult> GetFile(string username,string password,string fullName) { var client = new AzureFilesClient.AzureFilesClient(username,password); Stream stream = await client.GetFileStreamAsync(fullName); string fileName = Path.GetFileName(fullName); return new CustomActionResults.FileResultFromStream(fileName,stream,"application/msword"); }
注意:此示例仅用于Word文件,您可能希望将ContentType参数设置为动态,而不是像这样静态.
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