Core 6 Middleware Component error uploading file: "Form key length limit 2048 or value length limit 4194304 exceeded"

Question

I recently converted a .Net http handler to a .Net Core Middleware Component and am having trouble when uploading files. I'm getting the following error on this statement:

 if (context.Request.Form.ContainsKey(param))

System.IO.InvalidDataException: Form key length limit 2048 or value length limit 4194304 exceeded.

It appears that the entries in web.config of the .Net handler don't work in Core:

<httpRuntime requestValidationMode="2.0" maxRequestLength="2097151" executionTimeout="9999999" requestLengthDiskThreshold="10024000" />
<requestFiltering>
     <requestLimits maxAllowedContentLength="1024000000" maxQueryString="32768" maxUrl="65536" />
</requestFiltering>

I've seen where there may be issues with that in 3.1 and higher. Other references about creating a custom attribute to explicitly set key/value length limit. And others that simply used DisableRequestSizeLimit. Unfortunately, their examples referenced MVC applications and mine is very different. Here is the start of the code:

    private readonly RequestDelegate _next;

    public FileManager(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext context)
    {
    ....

I tried putting [DisableRequestSizeLimit] immediately before the public async Task Invoke but that still gave the error.

Can someone let me know what and where I need to add the higher limits to upload large files?.. or what other information I can provide?

EDIT FOR ANSWER:

I awarded the correct answer to Ruikai Feng but to make it clear for any future readers, here's the details.

Code was inside startup.cs:

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

I got carried away with maxing out all the values just to get it to work but it appeared x.ValueLengthLimit and x.KeyLengthLimit were the key players.

Answer 1

You could try to set as below:

services.Configure<FormOptions>(x => { x.KeyLengthLimit = newkeylength;x.MultipartBodyLengthLimit = newcontentlength; });

You could check this document related with file upload for more details