HttpClient 使用案例

get
HttpClient httpClient = new HttpClient();
var request = new HttpRequestMessage()
    {
        Content = null,
        Method = HttpMethod.Get,
        RequestUri = new Uri("https://oapi.dingtalk.com/gettoken?appkey=&appsecret=")
    };

var result = await httpClient.SendAsync(request);

form post

string url = "http://";

var values = new List<KeyValuePair<string, string>>();
values.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
values.Add(new KeyValuePair<string, string>("app_id", ""));
values.Add(new KeyValuePair<string, string>("tenant_id", ""));
values.Add(new KeyValuePair<string, string>("secret", ""));

var formdata = new FormUrlEncodedContent(values);

var result = await httpClient.PostAsync(url, formdata);

post 参数

var parameters = new Dictionary<string, string> { { "only_active", "false" }, { "param2", "2" } };
    var request = new HttpRequestMessage()
    {
        Content = new StringContent(JsonConvert.SerializeObject(parameters)),
        Method = HttpMethod.Post,
        RequestUri = new Uri($"https://oapi.dingtalk.com/topapi/user/count?access_token={token}")
    };