ActionFilterAttribute：HttpContext.Request.Body 始终为空

Question

我正在尝试在

ActionFilterAttribute

中获取请求正文。

JSON 值始终为“”。我正在使用 .NET7.0，我还将以下代码添加到

Program.cs

.Use(async (context, next) =>
    {
        try
        {
            context.Request.EnableBuffering();
            await next();
        }
        catch (Exception e)
        {
        }
         .
         .
         .

属性代码片段：

 public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
    {

        var expectedModel = context.ActionArguments.Values.FirstOrDefault();
        if (expectedModel == null)
        {
            context.Result = new BadRequestObjectResult("Model empty.");
            return;
        }

        var requestBodyStream = new MemoryStream();
        await context.HttpContext.Request.Body.CopyToAsync(requestBodyStream);
        requestBodyStream.Seek(0, SeekOrigin.Begin);
        var json = await new StreamReader(requestBodyStream).ReadToEndAsync();
}

我的控制器方法：

    [HttpPost("scoring/add")]
    [JsonModelValidationAttribute]
    public async Task<IActionResult> AddScoringResult([FromBody] ScoreModel model)
    {
      //I am going to add logic.
    }

我想获取请求正文并比较

ScoreModel

以检查是否有任何拼写错误的属性。如何从请求中获取正文？

课程和例子：

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

public class JsonModelValidationAttribute : ActionFilterAttribute
{
    public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
    {

        var expectedModel = context.ActionArguments.Values.FirstOrDefault();
        if (expectedModel == null)
        {
            context.Result = new BadRequestObjectResult("Model empty.");
            return;
        }

        var requestBodyStream = new MemoryStream();
        await context.HttpContext.Request.Body.CopyToAsync(requestBodyStream);
        requestBodyStream.Seek(0, SeekOrigin.Begin);
        var json = await new StreamReader(requestBodyStream).ReadToEndAsync();
        Console.WriteLine(json);
    }
}

评分模型

using System;
using System.Collections.Generic;
using System.Security.Principal;

namespace Scoring.Data.Custom;

public class ScoreModel
{
    public int Id { get; set; }


    public int Score { get; set; }

    public string Name { get; set; }
}

控制器

using Scoring.Data.Custom;
using Microsoft.AspNetCore.Mvc;
using System.Threading.Tasks;

namespace Scoring.API.Custom;

[ApiController]
public class ScoringController : ControllerBase
{

    public ScoringController()
    {

    }

    [HttpPost("scoring/add")]
    [JsonModelValidationAttribute]
    public async Task<IActionResult> AddScoringResult([FromBody] ScoreModel model)
    {

        return Ok(model);
    }
}