How to Overcome File Size Limits in ASP.NET Core Applications?

Managing Large File Uploads in ASP.NET Core

ASP.NET Core applications frequently require handling large file uploads. This article explains how to adjust the default file size limits to accommodate larger files.

IIS Configuration

IIS imposes a maximum file size limit. You can modify this restriction in two ways:

• web.config: Adjust the maxRequestLength attribute within the <httpRuntime> section.
• IIS Manager: Access the "Request Filtering" settings in the application pool and modify the "Maximum allowed content length (bytes)".

ASP.NET Core Limits

Beyond IIS, ASP.NET Core (starting with version 2.0) introduces its own size limits managed by the Kestrel server (refer to KestrelServerLimits.cs).

Increasing Request Body Size Limits

To increase the request body size limit in your ASP.NET Core application, use these methods:

Controller Actions

• RequestSizeLimit Attribute: Specify a maximum request body size for individual controller actions or entire controllers.
• DisableRequestSizeLimit Attribute: Completely disable the request size limit for specific actions or controllers. Use cautiously!

Middleware

• IHttpMaxRequestBodySizeFeature: Adjust the request size limit dynamically on a per-request basis using middleware.

Global Settings

Configure the maximum request body size globally using the MaxRequestBodySize property within the UseKestrel or UseHttpSys configuration callbacks.

By implementing these techniques, you can effectively manage file size limitations in both IIS and ASP.NET Core, enabling the upload of files of any desired size within your applications.

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