How Can I Increase Upload File Size Limits in ASP.NET Core?

Boosting Upload File Size Limits in ASP.NET Core Applications

In ASP.NET Core 2.0 and later, both IIS and the Kestrel server impose limits on the size of uploaded files. This article details how to overcome these restrictions.

Method 1: Action-Specific Limit Adjustment

For fine-grained control, adjust the upload limit for individual MVC actions or controllers using the RequestSizeLimit attribute. For example, to set a 100MB limit for the MyAction method:

<code class="language-csharp">[HttpPost]
[RequestSizeLimit(100_000_000)]
public IActionResult MyAction([FromBody] MyViewModel data) { }</code>

To completely remove the limit for a specific action, use the [DisableRequestSizeLimit] attribute.

Method 2: Middleware-Based Dynamic Configuration

For non-MVC applications, leverage the IHttpMaxRequestBodySizeFeature to dynamically adjust the limit. Here's an example:

<code class="language-csharp">app.Run(async context =>
{
    context.Features.Get<IHttpMaxRequestBodySizeFeature>().MaxRequestBodySize = 100_000_000;
});</code>

Method 3: Global Limit Modification

For a global solution, modify the MaxRequestBodySize property within the UseKestrel or UseHttpSys configuration callbacks. Setting this property to null disables the limit entirely.

<code class="language-csharp">.UseKestrel(options =>
{
    options.Limits.MaxRequestBodySize = null;
});</code>

Choose the method that best suits your application's architecture and requirements. Remember to consider security implications when increasing upload limits.

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