[英]Multipart Data Upload - Azure Function V2
正在將文檔上傳到 HTTP 觸發器 Azure 函數(版本 2)。 在我的函數中收到請求時,我看到 Files 部分為空,並且流被移動到 formdata 字典。 下面是如何上傳文檔的代碼,有人可以幫助我為什么它不在 IFormFileCollection 中填充流。
using (var _httpClient = new HttpClient())
{
MultipartFormDataContent form = new MultipartFormDataContent();
String headerValue = "form-data; name=\"file\"; filename=\"" + fileName + "\"";
byte[] bytes = Encoding.UTF8.GetBytes(headerValue);
headerValue = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
fileContent.Headers.Add("Content-Disposition", headerValue);
fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse("multipart/form-data");
form.Add(fileContent);
form.Add(new StringContent(metadataValue), metadataKey);
_httpClient.Timeout = TimeSpan.FromMinutes(15);
_httpClient.DefaultRequestHeaders.Add("Authorization", "Bearer " + bearerToken);
logger.LogInformation($"HttpUtils: UploadFileByMultipart() url:{url}, request param: {metadataValue} reference: {traceLogId}");
var response = await _httpClient.PostAsync(url, form).Result.Content.ReadAsStringAsync();
logger.LogInformation("HttpUtils: UploadFileByMultipart() end");
return response;
}
其他注意如何從字符串格式的 Formdata 字典中獲取流並將其轉換為我可以玩的流。 我在下面嘗試過,結果是一個空白文檔,破壞了所有流
requestHandler.stream = new MemoryStream();
var Content = formdata["file"].ToString();
var fileContent = new MemoryStream(Encoding.ASCII.GetBytes(Content));
如果我們想使用HttpClient
發送 Multipart Data,可以使用MultipartFormDataContent
來創建數據。
例如
我發送請求的代碼
MultipartFormDataContent form = new MultipartFormDataContent();
form.Add(new StringContent("jack"), "userName");
var fileContent = new ByteArrayContent(File.ReadAllBytes(@"D:\my.csv"));
// I use package MimeMapping : https://www.nuget.org/packages/MimeMapping/ to get file mine type
fileContent.Headers.ContentType = new MediaTypeHeaderValue(MimeUtility.GetMimeMapping("my.csv"));
fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
{
Name = "file",
FileName = "my.csv"
};
form.Add(fileContent);
using (var client = new HttpClient())
{
var res = await client.PostAsync("<function app url>", form);
if (res.IsSuccessStatusCode)
{
var content = await res.Content.ReadAsStringAsync();
Console.WriteLine(content);
}
}
using System.Net;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Newtonsoft.Json;
public static async Task<IActionResult> Run( [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
log.LogInformation("-------------------read file----------------------");
// read file
var files = req.Form.Files;
if (files.Count != 0) {
var file = files[0];
log.LogInformation(file.ContentType);
log.LogInformation(file.FileName);
log.LogInformation(file.ContentDisposition);
// use file.OpenReadStream to get a stream then use stream to rread file content
}
// read key
log.LogInformation("-------------------read key----------------------");
log.LogInformation($"The userName is {req.Form["userName"]}");
return new OkObjectResult("OK");
}
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