'HttpPostedFileBase' in Asp.Net Core 2.0

问题

I'm recently working on a ReactJS app that's calling an API (developed with .NET Core 2.0).

My question is how to use HttpPostedFileBase in an .NET Core 2.0 API in order to get file content and save it in database.

回答1:

You don't have HttpPostedFileBase in ASP.NET Core 2.0, but you can use IFormFile.

[HttpPost("UploadFiles")]
public async Task<IActionResult> Post(List<IFormFile> files)
{
    long size = files.Sum(f => f.Length);

    // full path to file in temp location
    var filePath = Path.GetTempFileName();

    foreach (var formFile in files)
    {
        if (formFile.Length > 0)
        {
            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                await formFile.CopyToAsync(stream);
            }
        }
    }

    // process uploaded files
    // Don't rely on or trust the FileName property without validation.

    return Ok(new { count = files.Count, size, filePath});
}

More here: https://docs.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads?view=aspnetcore-2.1

IFormFile is in the following namespace Microsoft.AspNetCore.Http.

回答2:

HttpPostedFileBase doesn't exist in ASP.NET Core. You should use IFormFile now, instead. However, that only works when you send the request as multipart/form-data, which you're likely not doing if you're working with a client-side framework like React. If you're posting JSON, you should set the JSON member that corresponds with your file property with the file encoded as a Base64 string. Server-side, you should then bind to byte[].

回答3:

You should also be able to get the files like this :

    [HttpPost]
    public ActionResult UploadFiles()
    {
        var files = Request.Form.Files;
        return Ok();
    }

来源：https://stackoverflow.com/questions/51021182/httppostedfilebase-in-asp-net-core-2-0