ASP.NET Core:防止针对单个操作的自动HTTP 400响应 [英] ASP.NET Core: Prevent Automatic HTTP 400 responses for individual action

问题描述

我喜欢自动HTTP 400响应是ASP.NET Core 2.1的新增功能，并且在大多数情况下效果都很好.

但是，在一项操作中，我需要在验证有效负载之前进行一些预处理.我有一个自定义验证器，该验证器需要模型中的两个值来执行验证.这些值之一在路径中，因此我想从路径上在模型上设置该值，然后进行验证.

我不想使用以下所有操作关闭功能:

  public void ConfigureServices(IServiceCollection服务){services.Configure< ApiBehaviorOptions>(options =>{options.SuppressModelStateInvalidFilter = true;});} 

有什么办法可以将其关掉吗?

我尝试修改InvalidModelStateResponseFactory，但是它没有解决我的问题，因为我仍然需要执行控制器操作:

  services.Configure< ApiBehaviorOptions>(options =>{options.InvalidModelStateResponseFactory = actionContext =>{var ignore = actionContext.ActionDescriptor.FilterDescriptors.Any(fd => fd.Filter是SuppressModelStateInvalidFilterAttribute);如果(忽略){//只能返回IActionResult，因此不输入控制器操作.}返回新的BadRequestObjectResult(actionContext.ModelState);};});[AttributeUsage(AttributeTargets.Method)]公共类SuppressModelStateInvalidFilterAttribute:FormatFilterAttribute{} 

这里是我在asp.net核心存储库上提出的一个问题的链接，以防万一，我可以找到它-解决方案

这可以通过针对特定情况实现自己的验证器来解决.文档中对此进行了很好的介绍.

https://docs.microsoft.com/zh-cn/aspnet/core/mvc/models/validation?view = aspnetcore-2.1#custom-validation

要么验证模型绑定器，要么创建定制模型绑定器，以在验证之前完成所有预处理.

I like the Automatic HTTP 400 responses functionality new to ASP.NET Core 2.1 and it's working out really well for most cases.

However, in one action I need to do a bit of pre-processing before validation the payload. I have a custom validator that requires two values in the model to perform validation. One of those values is in the path so I would like to set that value on the model from the path then validate.

I don't want to switch the functionality off for all actions with:

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<ApiBehaviorOptions>(options =>
    {
        options.SuppressModelStateInvalidFilter = true;
    });
}

Is there any way I could switch it off just for an individual action?

Edit:

I tried modifying the InvalidModelStateResponseFactory but it didn't solve my problem because I still need to get into the controller action:

services.Configure<ApiBehaviorOptions>(options =>
{
    options.InvalidModelStateResponseFactory = actionContext =>
    {
        var ignore = actionContext.ActionDescriptor.FilterDescriptors.Any(fd => fd.Filter is SuppressModelStateInvalidFilterAttribute);
        if (ignore)
        {
            // Can only return IActionResult so doesn't enter the controller action.
        }

        return new BadRequestObjectResult(actionContext.ModelState);
    };
});

[AttributeUsage(AttributeTargets.Method)]
public class SuppressModelStateInvalidFilterAttribute : FormatFilterAttribute
{
}

Edit:

Here's a link to an issue I raised on the asp.net core repo in case I get anywhere with that - https://github.com/aspnet/Mvc/issues/8575

解决方案

This could probably be solved by implementing your own validator for your specific case. It is covered quite well in the documentation.

https://docs.microsoft.com/en-us/aspnet/core/mvc/models/validation?view=aspnetcore-2.1#custom-validation

Either that or possibly a custom model binder to create your model with all the preprocessing done before it is validated.

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