Angular 7 HttpClient将请求参数发送到端点

Question

我有一个使用此Put请求方法的Angular服务：

put(peopleFieldID: number, peopleFieldName: string): Observable<number> {
let params = new HttpParams();
params = params.append("peopleFieldID", peopleFieldID.toString());
params = params.append("peopleFieldName", peopleFieldName);

return this.http
  .put<number>(this.url, { params: params })
  .pipe(catchError(this._errorHandling.handleError.bind(this)));}

以上命令在我的.net核心API上点击此端点：

    [Authorize(Roles = "Client")]
    [Route("")]
    [HttpPut]
    public IActionResult C_Update(int peopleFieldID, string peopleFieldName )
    {
        //Make call to the proper repo method.
        return Json(_peopleFieldRepo.C_Update(peopleFieldID, peopleFieldName));
    }

两个参数peopleFieldID和peopleFieldName始终为0且为null。我已经确定Angular前端正确地发送了params，但是后端无法识别它们。我还有很多其他端点可以正常工作。

Answer 1

您需要使用HttpParams设置查询参数，如果没有，则需要将null传递给有效负载：

const params = new HttpParams()
            .set('peopleFieldID', peopleFieldID.toString())
            .set('peopleFieldName', peopleFieldName);
// if you have a payload to pass you can do that in place of null below
return this.http
  .put<number>(this.url, null, { params: params })
  .pipe(catchError(this._errorHandling.handleError.bind(this)));}