使用HttpClient和Web API方法[FromBody]参数发布到Web API最终为空

Question

我正在尝试使用HttpClient POST到Web API.当我在Web API的Save方法中放置断点时,[FromBody] Product为null.这意味着我将产品发布到Web API的方式出了问题.有人可以看看下面的代码,看看我可能会出错的地方.我假设它与标题和内容类型有关.

POST从客户端存储库调用Web API,它应该通过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]产品参数最终为空.

Answer 1

您是否尝试过像提琴手那样检查请求？正如您所指出的,它需要content-type为application/json.但是你只是设置了接受标题.

尝试:

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