Client code to upload file via ASP.NET MVC WebApi

Question

I am trying to write code to upload file(s) by WinForm app to WebApi.

The WebApi code is like:

[HttpPost] [Route("UploadEnvelope")] [HostAuthentication(DefaultAuthenticationTypes.ExternalBearer)] public Task<HttpResponseMessage> PostUploadEnvelope() { HttpRequestMessage request = this.Request; if (!request.Content.IsMimeMultipartContent()) { throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); } string root = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/uploads"); var provider = new MultipartFormDataStreamProvider(root); var task = request.Content.ReadAsMultipartAsync(provider).ContinueWith<HttpResponseMessage>(o => { foreach (MultipartFileData fileData in provider.FileData) { if (string.IsNullOrEmpty(fileData.Headers.ContentDisposition.FileName)) { return Request.CreateResponse(HttpStatusCode.NotAcceptable, "This request is not properly formatted"); } string fileName = fileData.Headers.ContentDisposition.FileName; if (fileName.StartsWith("\"") && fileName.EndsWith("\"")) { fileName = fileName.Trim('"'); } if (fileName.Contains(@"/") || fileName.Contains(@"\")) { fileName = Path.GetFileName(fileName); } File.Move(fileData.LocalFileName, Path.Combine(root, fileName)); } return new HttpResponseMessage() { Content = new StringContent("Files uploaded.") }; } ); return task; }

But I am not sure how to call it and pass file in a client app.

static string UploadEnvelope(string filePath, string token, string url) { using (var client = new HttpClient()) { client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token); // How to pass file here ??? var response = client.GetAsync(url + "/api/Envelope/UploadEnvelope").Result; return response.Content.ReadAsStringAsync().Result; } }

Any help or suggestion is welcome. Thanks in advance!

Antti29 · Accepted Answer · 2017-09-26 06:18:01Z

First you are using Get method which is used for reading. You have to use Post instead.

Try the following:

public static string UploadEnvelope(string filePath,string token, string url) { using (var client = new HttpClient()) { client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token); using (var content = new MultipartFormDataContent("Envelope" + DateTime.Now.ToString(CultureInfo.InvariantCulture))) { content.Add(new StreamContent(new MemoryStream(File.ReadAllBytes(filePath))), "filename", "filename.ext"); using (var message = await client.PostAsync(url + "/api/Envelope/UploadEnvelope", content)) { var input = await message.Content.ReadAsStringAsync(); return "success"; } } } }

Note: For a large file you have to change configuration on IIS web.config.

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