Question

我有一个通用类，用于在网络中执行CRUD操作。

我有一个自定义类，从那里可以调用网络服务。

 public class RequestService:IRequest
{
    public HttpClient GetClient()
    {
         string USERNAME = "XXXXXX";
         string PASSWORD = "XXXXX";
         string BASE_ADDRESS = "https://something.net/api/sync/";

        var authValue = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{USERNAME}:{PASSWORD}")));
        var client = new HttpClient
        {
            BaseAddress = new Uri(BASE_ADDRESS),
            DefaultRequestHeaders = { Authorization = authValue }
        };
        return client;
    }

    public async Task<TResult> GetAsync<TResult>(HttpClient client, string url)
    {
        client.Timeout = TimeSpan.FromSeconds(30);
        var response = await client.GetAsync(url);
        response.EnsureSuccessStatusCode();
        var jsonString = await response.Content.ReadAsStringAsync();
        var result = JsonConvert.DeserializeObject<TResult>(jsonString);
        return result;
    }

    public async Task<string> GetStringAsync(HttpClient client, string url)
    {
        var httpRequest = new HttpRequestMessage(new HttpMethod("GET"), url);
        var response = client.SendAsync(httpRequest).Result;
        var jsonString = await response.Content.ReadAsStringAsync();
        return jsonString;
    }

    public async Task<TResult> PostAsync<TRequest, TResult>(HttpClient client, TRequest t,string url)
    {
        var json = JsonConvert.SerializeObject(t);
        HttpContent httpContent = new StringContent(json);
        httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        var response = await client.PostAsync(url, httpContent);
        response.EnsureSuccessStatusCode();
        var jsonString = await response.Content.ReadAsStringAsync();
        var result = JsonConvert.DeserializeObject<TResult>(jsonString);
        return result;

    }
}

在ViewModel中：

 public class DeviceService:IDevice
{
    private IRequest RequestService;

    public DeviceService(IRequest request)
    {
        RequestService = request;
    }

    public async Task<int> GetDeviceID()
    {
        var client = RequestService.GetClient();
        var id = await RequestService.PostAsync<Object, int>(client, null, "Registerdevice");
        return id;
    }
}

因此，当我拥有稳定的Internet或服务器的成功响应时，一切正常。现在，我想在代码中添加错误处理功能，包括：无互联网连接，其他网络异常和api错误处理，以便我可以将错误告知用户。我不确定该怎么做。我尝试在'RequestService'类中使用try-catch块并读取每个异常并抛出它，这意味着我必须在DeviceService类和ViewModel中添加try-catch块。还是我必须这样做？我不确定。

在通用HTTPClient类中添加错误处理

0 个答案: