如何使用Angular 6从这段代码中的C#更改函数AddDays？

import { HttpClient } from '@angular/common/http';

constructor(private http: HttpClient) { }

addDaysToCSharp(date: Date, days: number) {
  const url = 'your_backend_url'; // 替换为你的后端API地址
  const body = { date: date, days: days };

  return this.http.post(url, body);
}

<input type="date" [(ngModel)]="selectedDate">
<input type="number" [(ngModel)]="numberOfDays">
<button (click)="addDaysToCSharp(selectedDate, numberOfDays)">Add Days</button>
<p>{{ result }}</p>

[HttpPost]
public IActionResult AddDays([FromBody] DateModel model)
{
    DateTime result = model.Date.AddDays(model.Days);
    return Ok(result);
}

public class DateModel
{
    public DateTime Date { get; set; }
    public int Days { get; set; }
}