How Can I Handle File Uploads in ASP.NET Web API Without Disk Storage?

Using HttpClient to handle file uploads in ASP.NET Web API

Handling file uploads is a common requirement when developing RESTful services using ASP.NET Web API. This article explores how to use the Web API framework to receive an image or file POSTed by a client application.

The original code uses the HttpPostedFile parameter, this approach requires a physical location on the server to save the uploaded file. However, this article describes an alternative that keeps everything in memory without writing to the file system.

Updated code uses MultipartMemoryStreamProvider to read multi-part form data for POST requests. It iterates over file contents, accessing file names and their binary data. This approach allows processing of uploaded files without the need for file system storage.

The following is the modified code:

<code class="language-csharp">[HttpPost("api/upload")]
public async Task<IHttpActionResult> Upload()
{
    if (!Request.Content.IsMimeMultipartContent())
        throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);

    var provider = new MultipartMemoryStreamProvider();
    await Request.Content.ReadAsMultipartAsync(provider);
    foreach (var file in provider.Contents)
    {
        var filename = file.Headers.ContentDisposition.FileName.Trim('\"');
        var buffer = await file.ReadAsByteArrayAsync();
        // 使用文件名和其二进制数据执行任何操作。
    }

    return Ok();
}</code>

This solution provides a more flexible and efficient way to handle file uploads in Web API services, avoiding the need for file system storage and enabling seamless processing of uploaded content.

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