[英]Get file name from Asp.net Web Api controller
我有一個Web Api控制器,可以獲取文件。 (服務器)
[HttpGet]
[Route("api/FileDownloading/download")]
public HttpResponseMessage GetDocuments()
{
var result = new HttpResponseMessage(HttpStatusCode.OK);
var fileName = "QRimage2.jpg";
var filePath = HttpContext.Current.Server.MapPath("");
var fileBytes = File.ReadAllBytes(@"c:\\TMP\\QRimage2.jpg");
MemoryStream fileMemStream = new MemoryStream(fileBytes);
result.Content = new StreamContent(fileMemStream);
var headers = result.Content.Headers;
headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
headers.ContentDisposition.FileName = fileName;
headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
headers.ContentLength = fileMemStream.Length;
return result;
}
還有Xamarin Android客戶端,該客戶端使用控制器下載文件( http:// localhost:6100 / api / FileDownloading / download )
public void DownloadFile(string url, string folder)
{
string pathToNewFolder = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, folder);
Directory.CreateDirectory(pathToNewFolder);
try
{
WebClient webClient = new WebClient();
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
string pathToNewFile = Path.Combine(pathToNewFolder, Path.GetFileName(url));
webClient.DownloadFileAsync(new Uri(url), null);
}
catch (Exception ex)
{
if (OnFileDownloaded != null)
OnFileDownloaded.Invoke(this, new DownloadEventArgs(false));
}
}
一切正常,但是在我的Android設備上的文件瀏覽器中,我的文件名為“下載”而不是“ QRimage2.jpg”。 如何使用此控制器獲取實際的文件名?
這總是會是jpg嗎? 如果是這樣,我將MediaTypeHeaderValue更改為image/jpeg
通過這樣做,您是在告訴瀏覽器文件的確切類型,而不是通用文件。 我想這是個問題,因為您告訴Android瀏覽器它只是一個通用二進制文件。
您將需要使用Web響應來閱讀內容配置。 因此,我們不能直接使用DownloadFileAsync。
public async Task<string> DownloadFileAsync(string url, string folder)
{
var request = WebRequest.Create(url);
var response = await request.GetResponseAsync().ConfigureAwait(false);
var fileName = string.Empty;
if (response.Headers["Content-Disposition"] != null)
{
var contentDisposition = new System.Net.Mime.ContentDisposition(response.Headers["Content-Disposition"]);
if (contentDisposition.DispositionType == "attachment")
{
fileName = contentDisposition.FileName;
}
}
if (string.IsNullOrEmpty(fileName))
{
throw new ArgumentException("Cannot be null or empty.", nameof(fileName));
}
var filePath = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, folder, fileName);
using (var contentStream = response.GetResponseStream())
{
using (var fileStream = File.Create(filePath))
{
await contentStream.CopyToAsync(fileStream).ConfigureAwait(false);
}
}
return filePath;
}
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