Install

PM> Install-Package ChiKien276.AspNetCore.MultipartHelper -Version 0.0.6 

Usage

At first, you have to verify that is a multipart request

if (!MultipartRequestHelper.IsMultipartContentType(Request.ContentType))
{
    return BadRequest();
}

Use temporary folder

Uploaded files is temporarily saved in folder /Your/Temporary/Folder at LocalMultipartFileInfo.TemporaryLocaltion. LocalMultipartFileInfo also contains Length, FileName and Name of multipart file.

[HttpPost("Upload")]
[DisableFormValueModelBinding]
public async Task<IActionResult> Upload()
{
    ...
    
    //List<LocalMultipartFileInfo> files;
    
    (var model, var files) = await FileUploadHelper
                    .ParseRequestForm(this, "/Your/Temporary/Folder", new YourModel());

    if (!ModelState.IsValid)
    {
        foreach(var file in files)
        {
            // Delete files here
            System.IO.File.Delete(file.TemporaryLocation);
        }
        
        return BadRequest();
    }
    
    ...
}

Handle file stream yourself

[HttpPost("Upload")]
[DisableFormValueModelBinding]
public async Task<IActionResult> Upload()
{
    ...
    
    var model2 = await FileUploadHelper.ParseRequestForm(this, async (section, formFileInfo) =>
    {
        // This function will be called every time parser got a file 
        using (var fileStream = System.IO.File.Create($"/Path/To/{Guid.NewGuid().ToString()}"))
        {
            await section.Body.CopyToAsync(fileStream);
        }
    }, new StreamUpload());

    if (!ModelState.IsValid)
    {
        foreach(var file in files)
        {
            // Delete files here
            System.IO.File.Delete(file.TemporaryLocation);
        }
        
        return BadRequest();
    }
    
    ...
    
}

TODO

• Make it a custorm parser instead of extension method
• I haven't wrote any UnitTest at all