c# - 从 WebApi 接收 IActionResult

Question

我已经创建了 Web API，但我的问题是从它读取结果给客户端。

创建用户的WebApi方法:

[HttpPost]
public IActionResult PostNewUser([FromBody]UserDto userDto)
{
    if (userDto == null)
        return BadRequest(nameof(userDto));
    IUsersService usersService = GetService<IUsersService>();
    var id = usersService.Add(userDto);
    return Created("api/users/", id.ToString());
}

而要调用API代码的客户端是:

public int CreateUser(UserDto dto)
{
    using (HttpClient client = new HttpClient())
    {
        string endpoint = ApiQuery.BuildAddress(Endpoints.Users);
        var json = new StringContent(JsonConvert.SerializeObject(dto), Encoding.UTF8, "application/json");
        var postReult = client.PostAsync(endpoint, json).Result;
        return 1; //?? 
    }
}

有效，响应为 201 (Created) 但我不知道如何返回正确的结果，应该是:

/api/users/id_of_created_user

我在两个项目中都使用了netcore2.0

Answer 1

在 Web API 中手动构建创建的位置 URL

[HttpPost]
public IActionResult PostNewUser([FromBody]UserDto userDto) {
    if (userDto == null)
        return BadRequest(nameof(userDto));
    IUsersService usersService = GetService<IUsersService>();
    var id = usersService.Add(userDto);
    //construct desired URL
    var url = string.Format("api/users/{0}",id.ToString());
    return Created(url, id.ToString());
}

或者使用 CreateAt* 重载之一

//return 201 created status code along with the 
//controller, action, route values and the actual object that is created
return CreatedAtAction("ActionName", "ControllerName", new { id = id }, id.ToString());

//OR 

//return 201 created status code along with the 
//route name, route value, and the actual object that is created
return CreatedAtRoute("RouteName", new { id = id }, id.ToString());

在客户端中，位置是从响应的 header 中检索的。

status HttpClient client = new HttpClient();

public async Task<int> CreateUser(UserDto dto) {
    string endpoint = ApiQuery.BuildAddress(Endpoints.Users);
    var json = new StringContent(JsonConvert.SerializeObject(dto), Encoding.UTF8, "application/json");

    var postResponse = await client.PostAsync(endpoint, json);

    var location = postResponse.Headers.Location;// api/users/{id here}

    var id = await postResponse.Content.ReadAsAsync<int>();

    return id;
}

您似乎也在发送 id 作为响应的一部分，可以从响应内容中检索它。

注意 HttpClient 的重构，以避免每次都创建一个实例，这可能导致 socked 耗尽，从而导致错误。