将WebClient转换为HttpClient

我正在尝试将WebClient过去用于Win7项目的A转换为HttpClient在Win8.1系统上使用的A。

WenClient：

public static void PastebinSharp(string Username, string Password)
        {
            NameValueCollection IQuery = new NameValueCollection();

            IQuery.Add("api_dev_key", IDevKey);
            IQuery.Add("api_user_name", Username);
            IQuery.Add("api_user_password", Password);

            using (WebClient wc = new WebClient())
            {
                byte[] respBytes = wc.UploadValues(ILoginURL, IQuery);
                string resp = Encoding.UTF8.GetString(respBytes);

                if (resp.Contains("Bad API request"))
                {
                    throw new WebException("Bad Request", WebExceptionStatus.SendFailure);
                }
                Console.WriteLine(resp);
                //IUserKey = resp;
            }
        }

这是我对HttpClient的第一枪

public static async Task PastebinSharp(string Username, string Password)
        {
            using (HttpClient client = new HttpClient())
            {
                client.DefaultRequestHeaders.Add("api_dev_key", GlobalVars.IDevKey);
                client.DefaultRequestHeaders.Add("api_user_name", Username);
                client.DefaultRequestHeaders.Add("api_user_password", Password);

                using (HttpResponseMessage respOnse= await client.GetAsync(GlobalVars.IPostURL))
                {
                    using (HttpContent cOntent= response.Content)
                    {
                        string result = await content.ReadAsStringAsync();
                        Debug.WriteLine(result);
                        return result;
                    }
                }
            }
        }

我的HttpRequest回报，Bad API request, invalid api option而我的WebClient回报是成功的回应。

应该怎么做？

我当然知道我要添加标题而不是查询，但是我不知道如何添加查询...

UploadValuesWeb客户端在msdn页面上说，WebClient在POST请求中以application/x-www-form-urlencodedContent-type 发送数据。因此，您必须/可以使用FormUrlEncodedContenthttp内容。

public static async Task PastebinSharpAsync(string Username, string Password)
{
    using (HttpClient client = new HttpClient())
    {
        var postParams = new Dictionary();

        postParams.Add("api_dev_key", IDevKey);
        postParams.Add("api_user_name", Username);
        postParams.Add("api_user_password", Password);

        using(var postCOntent= new FormUrlEncodedContent(postParams))
        using (HttpResponseMessage respOnse= await client.PostAsync(ILoginURL, postContent))
        {
            response.EnsureSuccessStatusCode(); // Throw if httpcode is an error
            using (HttpContent cOntent= response.Content)
            {
                string result = await content.ReadAsStringAsync();
                Debug.WriteLine(result);
                return result;
            }
        }
    }
}