我想你只需要：[禁用请求大小限制]
下面是一个解决方案，我将Zip文件和附加的表单数据上传到运行.Net Core 3的API

// MultipartBodyLengthLimit  was needed for zip files with form data.
// [DisableRequestSizeLimit] works for the KESTREL server, but not IIS server 
// for IIS: webconfig... <requestLimits maxAllowedContentLength="102428800" />
[RequestFormLimits(ValueLengthLimit = int.MaxValue, MultipartBodyLengthLimit = int.MaxValue)] 
[DisableRequestSizeLimit] 
[Consumes("multipart/form-data")] // for Zip files with form data
[HttpPost("MyCustomRoute")]
public IActionResult UploadZippedFiles([FromForm] MyCustomFormObject formData)
{ }

注意：这是我在将应用程序从www.example.com core 2.1迁移到3.0时遇到的问题asp.net
为了在www.example.com core 3.0中解决这个问题asp.net，我已经修改了我的program.cs，以修改最大请求正文大小，如下所示。

public class Program
{
    public static void Main(string[] args)
    {
       CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args)
    {
       return WebHost.CreateDefaultBuilder(args)
            .ConfigureKestrel((context, options) =>
            {
                options.Limits.MaxRequestBodySize = 737280000;
            })
            .UseStartup<Startup>();
        }
    }
}

我的意思是，我刚刚添加了ConfigureKestrel部分，并在我的action方法[RequestSizeLimit(737280000)]上添加了一个属性，如下所示

[HttpPost]
[RequestSizeLimit(737280000)]
[Route("SomeRoute")]
public async Task<ViewResult> MyActionMethodAsync([FromForm]MyViewModel myViewModel)
{
   //Some code
   return View();
}

我的应用程序再次开始正常运行，没有抛出BadHttpRequestException: Request body too large
参考：https://learn.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads?view=aspnetcore-3.0#kestrel-maximum-request-body-size

对我来说（ASP.NET core 3.1），解决方案是在Startup.cs的ConfigureServices方法中添加以下行：

// 200 MB
    const int maxRequestLimit = 209715200;
    // If using IIS
    services.Configure<IISServerOptions>(options =>
    {
        options.MaxRequestBodySize = maxRequestLimit;
    });
    // If using Kestrel
    services.Configure<KestrelServerOptions>(options =>
    {
        options.Limits.MaxRequestBodySize = maxRequestLimit;
    });
    services.Configure<FormOptions>(x =>
    {
        x.ValueLengthLimit = maxRequestLimit;
        x.MultipartBodyLengthLimit = maxRequestLimit;
        x.MultipartHeadersLengthLimit = maxRequestLimit;
    });

和编辑web.config：

<system.webServer>
      <security>
        <requestFiltering>
          <requestLimits maxAllowedContentLength="209715200" />
        </requestFiltering>
      </security>
    </system.webServer>

我使用web.config进行配置（而我们的API托管在IIS中）：

<system.webServer>
    <security>
        <requestFiltering>
            <requestLimits maxAllowedContentLength="157286400" />
        </requestFiltering>
    </security>
</system.webServer>

但是现在我们将我们的api移到linux容器并使用Kestrel。然后我这样配置它：

.ConfigureWebHostDefaults(webBuilder =>
{
    webBuilder
    .ConfigureKestrel(serverOptions =>
    {
        serverOptions.Limits.MaxRequestBodySize = 157286400;
    })
    .UseStartup<Startup>();
})

157286400 = 150兆字节;

Azure函数的硬编码限制为100MB：https://github.com/Azure/azure-functions-host/issues/5854