使用HttpClient获取Graph API Token

　　前言

　　最近，在使用Graph API，然后，用HttpClient调用。可能，很多人讲不是有Net版本的API么，为什么要用Http去请求？对于这个，我只想说，好玩而已。

　　正文

　　下面是核心的代码，使用HttpClient发送请求token

public async static Task<string> GetGraphToken(string body, string talentid)
{
    using (HttpClient httpClient = new HttpClient())
    {
        var content = new StringContent(body);
        try
        {
            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, $"https://login.microsoftonline.com/{talentid}/oauth2/v2.0/token");
            request.Content = content;
            request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
            HttpResponseMessage response = await httpClient.SendAsync(request);
            if (response.IsSuccessStatusCode)
            {
                string responseBody = await response.Content.ReadAsStringAsync();
                GraphToken token = JsonConvert.DeserializeObject<GraphToken>(responseBody);
                Console.WriteLine("Response: " + token.access_token);
                return token.access_token;
            }
            else
            {
                Console.WriteLine("Error: " + response.StatusCode);
                return string.Empty;
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message.ToString());
            Console.WriteLine(e.StackTrace.ToString());
            return string.Empty;
        }
    }
}

　　调用：

string talentid = "12345678-cbbc-42b5-9576-56cac3b3be72";
string clientid = "b99fe2a4-028e-469a-9a6a-d60c956f34ac";
string secret = "_C11S~asf23FDA23JIJLIMNLJI-3HQ4Koogav_";

string body = $"grant_type=client_credentials&client_id={clientid}&client_secret={secret}&scope=https://graph.microsoft.com/.default";

string token = GetGraphToken(body, talentid).Result;

　　这里是拿到token，后面再请求使用token，然后发送对应的请求就好啦，灰常的简单。