Question

当我试图封装一个.net http客户端休息助手时遇到了一个问题，我只是不知道问题出在哪里，有人会这么善意提供帮助。下面的助手班：

public class RestHelper
{
    private string BuildApiUriFromRequest(HttpRequestBase request)
    {
        return request.Url.ToString();
    }
    private static IEnumerable<KeyValuePair<string, string>> GetFromForm(NameValueCollection form)
    {
        if (form == null) return null;
        Dictionary<string, string> nameValueCollection = new Dictionary<string, string>();
        form.AllKeys.ToList().ForEach(key =>
        {
            nameValueCollection.Add(key, form[key]);
        });
        return nameValueCollection;
    }
    public static void Get(string url, Action<string> customise)
    {
        RestMethod(url, null, customise, (httpClient, requestUrl, httpContent) =>
        {
            return httpClient.GetAsync(requestUrl);
        });
    }
    public static void Post(string url, NameValueCollection form, Action<string> customise)
    {
        RestMethod(url, form, customise, (httpClient, requestUrl, httpContent) => { return httpClient.PostAsync(requestUrl, httpContent); });
    }
    public static void Put(string url, NameValueCollection form, Action<string> customise)
    {
        RestMethod(url, form, customise, (httpClient, requestUrl, httpContent) => { return httpClient.PutAsync(requestUrl, httpContent); });
    }
    public static void Delete(string url, Action<string> customise)
    {
        RestMethod(url, null, customise, (httpClient, requestUrl, httpContent) => { return httpClient.DeleteAsync(requestUrl); });
    }
    public static void RestMethod(HttpRequestBase request, Action<string> customise)
    {
        Get(request.Url.ToString(), customise);
    }
    public static void RestMethod(string url, NameValueCollection form, Action<string> customise, Func<HttpClient, string, HttpContent, Task<HttpResponseMessage>> getResponseHttpMessage)
    {
        var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
        using (var client = new HttpClient(handler))
        {
            FormUrlEncodedContent content = null;
            if (form != null)
            {
                IEnumerable<KeyValuePair<string, string>>        nameValueCollection = GetFromForm(form);
                content = new FormUrlEncodedContent(nameValueCollection);
            }
            HandleResult(client, url, content, customise, getResponseHttpMessage);
        }
    }
    private static void HandleResult(HttpClient client, string url, FormUrlEncodedContent content, Action<string> customise, Func<HttpClient, string, HttpContent, Task<HttpResponseMessage>> getResponseHttpMessage)
    {
        getResponseHttpMessage(client, url, content).ContinueWith(httpResponseMessage =>
        {
            try
            {
                httpResponseMessage.Result.EnsureSuccessStatusCode();
                httpResponseMessage.Result.Content.ReadAsStringAsync().ContinueWith(readTask =>
                {
                    customise(readTask.Result);
                });
            }
            catch (Exception ex)
            {
                customise(ex.Message);
            }
        });
    }
}

当我遇到一些问题时，我正在测试get方法，它似乎是委托异常，但编译器没有显示更多异常细节，然后我尝试使用带有continue-with方法的原始httpclient，并且请求返回了正确的结果json字符串。关于httphandler，我错了吗？使用纯http客户端可能没问题？但我希望它更苗条......

.net httpclient封装＆＃34;一个或多个错误＆＃34;发生

0 个答案: