如何在點網 c# 中擊中 controller 之前讀取原始 json 柱體？

Question

我需要實現一個[HttpPost] web api 具有相同的路由/uri，但在 json 正文中有超過 10 種不同的參數組合。 其中一些參數在某些情況下是null但在另一種情況下是required的。 當我將一個已經部署的項目遷移到 dot net 6 時，我沒有修改 api 路由的自由。

I have planned to execute this requirement by reading entire json raw body data in a model binder , deserialize it and setting it to different model classes before hitting the controller . 我認為這種方法還可以幫助我進行model state validations ，因此我不需要在controller或service中執行任何手動驗證。

java（Maven Web App Controller）中已經存在的代碼：

@PostMapping(produces = HttpUtilities.APPLICATION_JSON_UTF8_VALUE, consumes = HttpUtilities.APPLICATION_JSON_UTF8_VALUE)
public ResponseEntity<HashMap<String, Object>> postForApproving(@RequestBody HashMap<String, Object> record,
        HttpServletRequest request) {

    RequestStore requestStore = (RequestStore) request.getAttribute("requestStore");

    logger.info("postForApproving({})", requestStore.toString());

    AuthorizationService.checkApiRole(requestStore, "postForApproving_" + entity_name, "Staff-Management");

    HashMap<String, Object> respBody = getService().postForApproving(requestStore, record);

    return new ResponseEntity<HashMap<String, Object>>(respBody, HttpUtilities.getResponseHeaders(requestStore),
            HttpStatus.CREATED);
}

並且在服務中，在 else-if 條件中檢查請求記錄中的“action”參數，並針對每種情況調用相應的存儲庫方法。

Answer 1

定制 Model 粘合劑：

public class GetModelBindingContext : IModelBinder
{
    public async Task BindModelAsync(ModelBindingContext bindingContext)
    {
        string json;
        using (var reader = new StreamReader(bindingContext.ActionContext.HttpContext.Request.Body, Encoding.UTF8))
            json = await reader.ReadToEndAsync();

        bindingContext.Result = ModelBindingResult.Success(json);
    }
}

Api Controller：

[ApiController]
public class ApproverDataController : ControllerBase
{
    private readonly IApproverDataService _myService;
    private readonly IModelBinder _modelBinder;

    public MyController(IMyService myService)
    {
        _myService = myService;
    }

    [Route("rest/prd/v1/post_data/body")]
    [HttpPost]
    public async Task<IActionResult> PostForAction([FromBody][ModelBinder(BinderType = typeof(GetModelBindingContext))] string json)
    {
        dynamic requestBody = JsonConvert.DeserializeObject(json);
        return Ok("Success!");
    }
}