c# – 使用HttpClient和Web API方法发布到Web API [FromBody]参数最终为null

我试图使用HttpClient对Web API进行POST.当我在Web API的Save方法中放置一个断点时,[FromBody] Product为null.这意味着我将产品发布到Web API的方式有问题.有人可以看看下面的代码,看看我可能会出错.我假设它与头文件和内容类型有关.

从客户端存储库到Web API的POST调用,该API应该通过JSON传递产品对象：

public async Task<Product> SaveProduct(Product product)
{
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("http://localhost:99999/");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        StringContent content = new StringContent(JsonConvert.SerializeObject(product));
        // HTTP POST
        HttpResponseMessage response = await client.PostAsync("api/products/save",content);
        if (response.IsSuccessstatusCode)
        {
            string data = await response.Content.ReadAsstringAsync();
            product = JsonConvert.DeserializeObject<Product>(data);
        }
    }
    return product;
}

Web API控制器方法：

[HttpPost]
[Route("save")]
public IActionResult Save([FromBody]Product product)
{
    if (customer == null)
    {
        return HttpBadRequest();
    }
    _manager.SaveCustomer(product);
    return CreatedAtRoute("Get",new { controller = "Product",id = product.Id },product);
}

[FromBody]产品参数最终为null.

StringContent content = new StringContent(JsonConvert.SerializeObject(product),Encoding.UTF8,"application/json");