解析模型状态错误

Question

我正在将WebApi和Xamarin Forms用于移动应用程序。我正在使用WebApi的内置用户身份验证/帐户功能，但是我不确定如何解析来自具有ModelState错误的BadRequest响应中的错误。

AccountController当前具有：

if (!ModelState.IsValid)
{
    logger.Info("ModelState not IsValid");
    logger.Error(ModelState.ToString);
    return BadRequest(ModelState);

}

这将返回任何模型状态错误（电子邮件不正确，密码不匹配等）

在我的客户端代码中，我有这个

注册帐户方法：

var response = await repository.PostAsync<SignUpModel> 
(builder.ToString(), model, "");

存储库：

    public async Task<T> PostAsync<T>(string uri, T data, string authToken = "")
    {
        try
        {
            HttpClient httpClient = CreateHttpClient(authToken);
            var content = new StringContent(JsonConvert.SerializeObject(data));
            content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

            string jsonResult = string.Empty;


            var responseMessage = await httpClient.PostAsync(uri, content);

            if (responseMessage.IsSuccessStatusCode)
            {
                jsonResult = await responseMessage.Content.ReadAsStringAsync().ConfigureAwait(false);
                var json = JsonConvert.DeserializeObject<T>(jsonResult);
                return json;
            }

            if (responseMessage.StatusCode == HttpStatusCode.Unauthorized)
            {
                throw new UnauthorizedAccessException();
            }

            else if (responseMessage.StatusCode == HttpStatusCode.PreconditionFailed)
            {
                throw new Exception(responseMessage.ReasonPhrase);
            }

            else
            {
                throw new Exception(responseMessage.StatusCode.ToString());
            }

        }
        catch (Exception e)
        {
            throw e;

        }

    }

SignUpModel：

public class SignUpPageModel
{

    public int MobileNumber { get; set; }
    public string FirstName { get; set; }
    public string Gender { get; set; }
    public DateTime DateOfBirth { get; set; }
    public string Email { get; set; }
    public string Password { get; set; }
    public string ConfirmPassword { get; set; }

}

我想捕获ModelState错误，然后向用户显示有关他们需要解决的问题的消息。