WEB API - File upload with json data

Question

Hello to all, I am trying to make a web API in c# for sending an email. My API is ready to send an email with the body part. Now I am trying to implement attachment. I have to upload attachment files to the server and I studied many documents to upload file on the server. I also got the success to upload files with MultiPart Async. But can anyone suggest me that how can I handle the upload files and also send the JSON data in a single request? Means when I call the API to send the email I have to send the data like, From email address, to address, body part. And also I want to upload the attachment file in the same request. I appreciate the suggestion. Thank You.

Ajay Gohil · Answer

File Upload Web API: [HttpPost] [Route("api/DocumentUpload/MediaUpload")] public async Task MediaUpload() { // Check if the request contains multipart/form-data. if (!Request.Content.IsMimeMultipartContent()) { throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); } var provider = await Request.Content.ReadAsMultipartAsync (new InMemoryMultipartFormDataStreamProvider()); NameValueCollection formData = provider.FormData; IList files = provider.Files; HttpContent file1 = files[0]; var thisFileName = file1.Headers.ContentDisposition.FileName.Trim('\"'); ////-------------------------------------For testing---------------------------------- //to append any text in filename. //var thisFileName = file1.Headers.ContentDisposition.FileName.Trim('\"') + DateTime.Now.ToString("yyyyMMddHHmmssfff"); //ToDo: Uncomment this after UAT as per Jeeevan //List tempFileName = thisFileName.Split('.').ToList(); //int counter = 0; //foreach (var f in tempFileName) //{ // if (counter == 0) // thisFileName = f; // if (counter > 0) // { // thisFileName = thisFileName + "_" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + "." + f; // } // counter++; //} ////-------------------------------------For testing---------------------------------- string filename = String.Empty; Stream input = await file1.ReadAsStreamAsync(); string directoryName = String.Empty; string URL = String.Empty; string tempDocUrl = WebConfigurationManager.AppSettings["DocsUrl"]; if (formData["ClientDocs"] == "ClientDocs") { var path = HttpRuntime.AppDomainAppPath; directoryName = System.IO.Path.Combine(path, "ClientDocument"); filename = System.IO.Path.Combine(directoryName, thisFileName); //Deletion exists file if (File.Exists(filename)) { File.Delete(filename); } string DocsPath = tempDocUrl + "/" + "ClientDocument" + "/"; URL = DocsPath + thisFileName; } using (Stream file = File.OpenWrite(filename)) { input.CopyTo(file); file.Close(); } var response = Request.CreateResponse(HttpStatusCode.OK); response.Headers.Add("DocsUrl", URL); return response; }

Keyur Mehta · Answer

Hello Ahay, Thank you for your response. But I can see that you are sending the data in the file header. Is there any other way to send the JSON data in the same request.

Rajeesh Menoth · Answer

Hi, Please have a look at my sending email with attachment article may be this will give you some idea. Reference : https://www.c-sharpcorner.com/UploadFile/2a6dc5/send-multiple-email-with-attachment-using-Asp-Net-with-C-Sharp/

Guest User · Answer

You could send the attachment encoded as base64 in your JSON.