ASP.NET Core MVC：上传的文件很大时，IFormFile 返回 Null

Question

I have a student project for C# Course implemented in ASP.NET Core MVC. Its file upload website, smaller files uploads flawlessly (65 mb, more or less) but large files as for example, 600 mb movie the IFormFile is null. I use .NET 6.0.

Uploading logic is implemented in MovieController -> https://dpaste.org/PBgks (a variable "file" is null) and CSHTML view uploadfile is here -> https://dpaste.org/25mOS

My project passed but I want to solve this bug once and for all

PS: If I forgot to mention some crucial info to solve this problem, please feel free to remind me.

Sorry for my rusty English.

UPDATE #1: After repeating a uploading process with larger files, it magically uploads (I had to click on upload button a dozen times). It's really weird.

Answer 1

Try to find a way to change the maxRequestLength property. Although I don't think the problem with it when the default value is only 4MB or has been changed by you before.

Answer 2

Did you try to apply RequestFormLimits attribute and set the MultipartBodyLengthLimit , like below?

[RequestFormLimits(MultipartBodyLengthLimit = 6104857600)] 
public async Task<IActionResult> UploadFile(IFormFile file, int id)
{
    // your core here...
}

In additional, if you are running under the IIS set maxAllowedContentLength parameter in the web.config . For the ASP.NET Core MVC project this file doesn't added automatically, but it still needed for the IIS and should be added manually.

<system.webServer>
    <security>
      <requestFiltering>
         <requestLimits maxAllowedContentLength="4147483648" /> 
      </requestFiltering>
    </security>
    ...
</system.webServer>

Configuring the FormsOptions parameters through the startup.cs file:

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<FormOptions>(o =>
    {
        o.ValueLengthLimit = int.MaxValue;
        o.MultipartBodyLengthLimit = long.MaxValue; 
    });

    services.AddControllersWithViews();
}

Answer 3

code for _storageServices.UploadFile is not provided. though i think you code:

public async Task<IActionResult> UploadFile(IFormFile file, int id)
    {
        var viewMod = new UploadViewModel();
        viewMod.Id = id;
      
        try
        {
            await _storageServices.UploadFile(file, id).ConfigureAwait(false);
            ViewBag.Message = "File Uploaded Successfully!!";               
            return View(viewMod);
        }
        catch
        {
            ViewBag.Message = "File upload failed!!";
            return View(viewMod);
        }
    }

looks like you are just passing it to the service which then updates the database.

if your intention is to upload it to some dir then use this code:

try
{   
    //this will upload the file to directory
    using (var stream = new FileStream("upload path", FileMode.Create))
    {
        await file.CopyToAsync(stream);
    }

    //your code for entry of file in database
    await _storageServices.UploadFile(file, id).ConfigureAwait(false);
    ViewBag.Message = "File Uploaded Successfully!!";               
    return View(viewMod);
}
catch
{
    ViewBag.Message = "File upload failed!!";
    return View(viewMod);
}