How to send multipart/form-data to ASP.NET Core Web API?

How to send multipart/form-data to ASP.NET Core Web API?

To send a multipart/form-data request to an ASP.NET Core Web API, follow these steps:

  • First, add the [FromForm] attribute to the action method parameter that is expecting the file content.
public async Task<IActionResult> Upload([FromForm]IFormFile file) { // handle file upload return Ok(); }
  • In the client application, create a FormDataContent object to represent the multipart request body.
using (var content = new MultipartFormDataContent()) { var fileContent = new ByteArrayContent(fileBytes); fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse("image/jpeg"); content.Add(fileContent, "file", "image.jpg"); // add other form data if needed }
  • Create an HttpClient object and send the request using the PostAsync method.
using (var httpClient = new HttpClient()) { var response = await httpClient.PostAsync("api/upload", content); if (!response.IsSuccessStatusCode) { // handle error } }

Make sure to set the correct content type header on the HttpClient instance:

httpClient.DefaultRequestHeaders.Accept.Clear(); httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("multipart/form-data"));

That's it! The server should be able to receive the multipart/form-data request and extract the file content from the IFormFile parameter in the action method.

Examples

  1. How to send multipart/form-data to ASP.NET Core Web API using HttpClient?

    • Description: This query seeks guidance on utilizing HttpClient to send multipart/form-data requests to an ASP.NET Core Web API.
    using (var client = new HttpClient()) { using (var content = new MultipartFormDataContent()) { // Add file content var fileContent = new ByteArrayContent(fileBytes); fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse("multipart/form-data"); content.Add(fileContent, "file", "filename.txt"); // Add other form data if needed content.Add(new StringContent("value1"), "key1"); // Send request var response = await client.PostAsync("https://your-api-endpoint", content); // Handle response if (response.IsSuccessStatusCode) { // Process successful response } else { // Handle error response } } }

  2. How to upload files using multipart/form-data in ASP.NET Core Web API?

    • Description: This query targets uploading files using multipart/form-data requests specifically in the context of ASP.NET Core Web API.
    [HttpPost("upload")] public async Task<IActionResult> Upload(IFormFile file) { if (file == null || file.Length == 0) return BadRequest("No file uploaded."); // Process uploaded file // Example: Save to disk or database return Ok("File uploaded successfully."); }

  3. ASP.NET Core Web API multipart/form-data file upload example

    • Description: This query likely aims to find a comprehensive example demonstrating multipart/form-data file upload in ASP.NET Core Web API.
    [HttpPost("upload")] public async Task<IActionResult> Upload(IFormFile file) { if (file == null || file.Length == 0) return BadRequest("No file uploaded."); // Process uploaded file // Example: Save to disk or database return Ok("File uploaded successfully."); }

  4. Sending multipart/form-data requests to ASP.NET Core Web API from Postman

    • Description: This query focuses on understanding how to construct and send multipart/form-data requests to an ASP.NET Core Web API endpoint using Postman.

    (No code example needed; it involves setting up the form-data body in Postman)

  5. ASP.NET Core Web API multipart/form-data validation

    • Description: This query is about implementing validation for multipart/form-data requests in ASP.NET Core Web API to ensure data integrity and security.

    (Code example could involve model validation or custom validation logic)

  6. Handling multipart/form-data in ASP.NET Core Web API controller

    • Description: This query aims to understand how ASP.NET Core Web API controllers handle multipart/form-data requests internally.

    (Explanation of model binding for IFormFile or custom model binding)

  7. How to parse multipart/form-data in ASP.NET Core Web API?

    • Description: This query seeks information on how ASP.NET Core Web API parses and processes multipart/form-data requests.

    (Explanation of IFormFile and its usage in controller methods)

  8. Uploading multiple files using multipart/form-data in ASP.NET Core Web API

    • Description: This query is interested in uploading multiple files through a single multipart/form-data request in ASP.NET Core Web API.
    [HttpPost("upload-multiple")] public async Task<IActionResult> UploadMultiple(List<IFormFile> files) { if (files == null || files.Count == 0) return BadRequest("No files uploaded."); // Process each uploaded file // Example: Save to disk or database return Ok("Files uploaded successfully."); }

  9. ASP.NET Core Web API receive multipart/form-data request

    • Description: This query looks for guidance on receiving and handling multipart/form-data requests in ASP.NET Core Web API controllers.

    (Similar to earlier examples with additional emphasis on request handling)

  10. How to handle large files with multipart/form-data in ASP.NET Core Web API?

    • Description: This query focuses on strategies for handling large files efficiently when uploaded as multipart/form-data to an ASP.NET Core Web API.

    (Discussion of streaming uploads or using third-party libraries for efficient handling)

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