How to solve the problem of upload restrictions on Mvc files in ASP.NET Core

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I. brief introduction

In ASP.NET Core MVC, the maximum upload file for file upload defaults to 20MB. If we want to upload some large files, we don't know how to set it up. How should we start without Web.Config?

Second, set the upload file size

1. Application level settin

We need to add the following code to the ConfigureServices method to set the file upload size limit to 60 MB.

Public void ConfigureServices (IServiceCollection services) {servicesConfigure (options = > {optionsMultipartBodyLengthLimit = 6000000;});}

2.Action level settin

In addition to the global settings above, we can also control a single Action by customizing Filter. The Filter code is as follows:

[AttributeUsage (AttributeTargetsClass | AttributeTargetsMethod, AllowMultiple = false, Inherited = true)] public class RequestFormSizeLimitAttribute: Attribute, IAuthorizationFilter, IOrderedFilter {private readonly FormOptions _ formOptions; public RequestFormSizeLimitAttribute (int valueCountLimit) {_ formOptions = new FormOptions () {ValueCountLimit = valueCountLimit};} public int Order {get; set;} public void OnAuthorization (AuthorizationFilterContext context) {var features = contextHttpContextFeatures; var formFeature = featuresGet () If (formFeature = = null | | formFeatureForm = = null) {/ / Request form has not been read yet, so set the limits featuresSet (new FormFeature (contextHttpContextRequest, _ formOptions));}

Because in ASP.NET Core MVC, what is different from the previous version is that the specific functions are encapsulated in various Feature (features), and the HttpContext context is just a container that can be managed by each feature. In this Filter, only Action is intercepted, and the FormFeature (responsible for form submission function) in HttpContext is reset to achieve the purpose of limiting the size of specific Action uploaded files.

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