我正在尝试将一个或多个文件 (.doc) 发送到 ASP.NET Web API 2 服务并返回修改后的版本 (.docx)。我能够发送文件并获得响应,但是我在请求中 HTTPContent 的服务中使用的 HttpContentMultipartExtensions 在客户端中无法返回以用于响应。这是开箱即用的东西,可以连接起来,还是对 multipartform 的滥用?
有两个应用程序:MVC 客户端和 Web API 服务:
客户端 Controller (从 App_Data 读取示例文件,POST 到 serviceserver/api/mpformdata):
public async Task<ActionResult> PostMpFormData()
{
DirectoryInfo dir = new DirectoryInfo(Server.MapPath(@"~\App_Data"));
var files = dir.GetFiles().ToList();
using (HttpClient client = new HttpClient())
{
HttpResponseMessage result = new HttpResponseMessage();
using (MultipartFormDataContent mpfdc = new MultipartFormDataContent())
{
foreach (var file in files)
{
mpfdc.Add(new StreamContent(file.OpenRead()), "File", file.Name);
}
var requestUri = ConfigurationManager.AppSettings["DocumentConverterUrl"] + "/api/mpformdata";
client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("multipart/form-data"));
result = client.PostAsync(requestUri, mpfdc).Result;
}
ViewBag.ResultStatusCode = result.StatusCode;
ViewBag.ContentLength = result.Content.Headers.ContentLength;
// Fiddler show that it returns multipartform content, but how do I use it?
// var resultContent = result.Content;
}
return View();
}
Web API 服务的 Controller :
public class UploadController : ApiController
{
[HttpPost, Route("api/mpformdata")]
public async Task<HttpResponseMessage> PostMpFormData()
{
if (!Request.Content.IsMimeMultipartContent())
{
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
return await UseMultipartFormDataStream();
}
private async Task<HttpResponseMessage> UseMultipartFormDataStream()
{
string root = HttpContext.Current.Server.MapPath("~/App_Data");
var provider = new MultipartFormDataStreamProvider(root);
MultipartFormDataContent mpfdc = new MultipartFormDataContent();
try
{
await Request.Content.ReadAsMultipartAsync(provider);
foreach (MultipartFileData file in provider.FileData)
{
var filename = file.Headers.ContentDisposition.FileName;
Trace.WriteLine(filename);
Trace.WriteLine("Server file path: " + file.LocalFileName);
mpfdc.Add(new ByteArrayContent(File.ReadAllBytes(file.LocalFileName)), "File", filename);
}
var response = Request.CreateResponse();
response.Content = mpfdc;
response.StatusCode = HttpStatusCode.OK;
return response;
}
catch (System.Exception e)
{
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
}
}
}
最佳答案
多部分扩展是 System.Net.Http.Formatting
dll 的一部分。确保在客户端安装了 nuget 包 Microsoft.AspNet.WebApi.Client
。
关于c# - Web API POST MultipartFormDataContent : Can response return multipartform content?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21173536/