代码修改后的版本，全部提交

Jiguang.JPush/ReportClient.cs

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+using Jiguang.JPush.Model;
+using Newtonsoft.Json.Linq;
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Jiguang.JPush
+{
+    public class ReportClient
+    {
+        public const string BASE_URL_REPORT_DEFAULT = "https://report.jpush.cn/v3";
+        public const string BASE_URL_REPORT_BEIJING = "https://bjapi.push.jiguang.cn/v3/report";
+
+        private string BASE_URL = BASE_URL_REPORT_DEFAULT;
+
+        /// <summary>
+        /// 设置 Report API 的调用地址。
+        /// <see cref="https://docs.jiguang.cn/jpush/server/push/rest_api_v3_report/"/>
+        /// </summary>
+        /// <param name="url"><see cref="BASE_URL_REPORT_DEFAULT"/> or <see cref="BASE_URL_REPORT_BEIJING"/></param>
+        public void SetBaseURL(string url)
+        {
+            BASE_URL = url;
+        }
+
+        /// <summary>
+        /// <see cref="GetMessageReport(List{string})"/>
+        /// </summary>
+        public async Task<HttpResponse> GetMessageReportAsync(List<string> msgIdList)
+        {
+            if (msgIdList == null)
+                throw new ArgumentNullException(nameof(msgIdList));
+
+            var msgIds = string.Join(",", msgIdList);
+            var url = BASE_URL + "/received?msg_ids=" + msgIds;
+            HttpResponseMessage msg = await JPushClient.HttpClient.GetAsync(url).ConfigureAwait(false);
+            var content = await msg.Content.ReadAsStringAsync().ConfigureAwait(false);
+            return new HttpResponse(msg.StatusCode, msg.Headers, content);
+        }
+
+        /// <summary>
+        /// 获取指定 msg_id 的消息送达统计数据。
+        /// </summary>
+        /// <param name="msgIdList">消息的 msg_id 列表，每次最多支持 100 个。</param>
+        public HttpResponse GetMessageReport(List<string> msgIdList)
+        {
+            Task<HttpResponse> task = Task.Run(() => GetMessageReportAsync(msgIdList));
+            task.Wait();
+            return task.Result;
+        }
+
+        /// <summary>
+        /// <see cref="GetReceivedDetailReport(List{string})"/>
+        /// </summary>
+        public async Task<HttpResponse> GetReceivedDetailReportAsync(List<string> msgIdList)
+        {
+            if (msgIdList == null)
+                throw new ArgumentNullException(nameof(msgIdList));
+
+            var msgIds = string.Join(",", msgIdList);
+            var url = BASE_URL + "/received/detail?msg_ids=" + msgIds;
+            HttpResponseMessage msg = await JPushClient.HttpClient.GetAsync(url).ConfigureAwait(false);
+            var content = await msg.Content.ReadAsStringAsync().ConfigureAwait(false);
+            return new HttpResponse(msg.StatusCode, msg.Headers, content);
+        }
+
+        /// <summary>
+        /// 送达统计详情（新）
+        /// <see cref="https://docs.jiguang.cn/jpush/server/push/rest_api_v3_report/#_7"/>
+        /// </summary>
+        /// <param name="msgIdList">消息的 msg_id 列表，每次最多支持 100 个。</param>
+        public HttpResponse GetReceivedDetailReport(List<string> msgIdList)
+        {
+            Task<HttpResponse> task = Task.Run(() => GetReceivedDetailReportAsync(msgIdList));
+            task.Wait();
+            return task.Result;
+        }
+
+        /// <summary>
+        /// <see cref="GetMessageSendStatus(string, List{string}, string)"/>
+        /// </summary>
+        public async Task<HttpResponse> GetMessageSendStatusAsync(string msgId, List<string> registrationIdList, string data)
+        {
+            if (string.IsNullOrEmpty(msgId))
+                throw new ArgumentNullException(nameof(msgId));
+
+            if (registrationIdList == null)
+                throw new ArgumentNullException(nameof(registrationIdList));
+
+            JObject body = new JObject
+            {
+                { "msg_id", long.Parse(msgId) },
+                { "registration_ids", JArray.FromObject(registrationIdList) }
+            };
+
+            if (!string.IsNullOrEmpty(data))
+                body.Add("data", data);
+
+            var url = BASE_URL + "/status/message";
+            var httpContent = new StringContent(body.ToString(), Encoding.UTF8);
+
+            HttpResponseMessage msg = await JPushClient.HttpClient.PostAsync(url, httpContent).ConfigureAwait(false);
+            var content = await msg.Content.ReadAsStringAsync().ConfigureAwait(false);
+            return new HttpResponse(msg.StatusCode, msg.Headers, content);
+        }
+
+        /// <summary>
+        /// 查询指定消息的送达状态。
+        /// <para><see cref="https://docs.jiguang.cn/jpush/server/push/rest_api_v3_report/#_7"/></para>
+        /// </summary>
+        /// <param name="msgId">待查询消息的 Message Id。</param>
+        /// <param name="registrationIdList">收到消息设备的 Registration Id 列表。</param>
+        /// <param name="data">待查询日期，格式为 yyyy-MM-dd。如果传 null，则默认为当天。</param>
+        public HttpResponse GetMessageSendStatus(string msgId, List<string> registrationIdList, string data)
+        {
+            Task<HttpResponse> task = Task.Run(() => GetMessageSendStatusAsync(msgId, registrationIdList, data));
+            task.Wait();
+            return task.Result;
+        }
+
+        /// <summary>
+        /// <see cref="GetMessageDetailReport(List{string})"/>
+        /// </summary>
+        public async Task<HttpResponse> GetMessageDetailReportAsync(List<string> msgIdList)
+        {
+            if (msgIdList == null)
+                throw new ArgumentNullException(nameof(msgIdList));
+
+            var msgIds = string.Join(",", msgIdList);
+            var url = BASE_URL + "/messages?msg_ids=" + msgIds;
+            HttpResponseMessage msg = await JPushClient.HttpClient.GetAsync(url).ConfigureAwait(false);
+            var content = await msg.Content.ReadAsStringAsync().ConfigureAwait(false);
+            return new HttpResponse(msg.StatusCode, msg.Headers, content);
+        }
+
+        /// <summary>
+        /// 消息统计（VIP 专属接口，旧）
+        /// <see cref="https://docs.jiguang.cn/jpush/server/push/rest_api_v3_report/#vip"/>
+        /// </summary>
+        /// <param name="msgIdList">消息的 msg_id 列表，每次最多支持 100 个。</param>
+        public HttpResponse GetMessageDetailReport(List<string> msgIdList)
+        {
+            Task<HttpResponse> task = Task.Run(() => GetMessageDetailReportAsync(msgIdList));
+            task.Wait();
+            return task.Result;
+        }
+
+        /// <summary>
+        /// <see cref="GetMessagesDetailReport(List{string})"/>
+        /// </summary>
+        public async Task<HttpResponse> GetMessagesDetailReportAsync(List<string> msgIdList)
+        {
+            if (msgIdList == null)
+                throw new ArgumentNullException(nameof(msgIdList));
+
+            var msgIds = string.Join(",", msgIdList);
+            var url = BASE_URL + "/messages/detail?msg_ids=" + msgIds;
+            HttpResponseMessage msg = await JPushClient.HttpClient.GetAsync(url).ConfigureAwait(false);
+            var content = await msg.Content.ReadAsStringAsync().ConfigureAwait(false);
+            return new HttpResponse(msg.StatusCode, msg.Headers, content);
+        }
+
+        /// <summary>
+        /// 消息统计详情（VIP 专属接口，新）
+        /// <see cref="https://docs.jiguang.cn/jpush/server/push/rest_api_v3_report/#vip_1"/>
+        /// </summary>
+        /// <param name="msgIdList">消息的 msg_id 列表，每次最多支持 100 个。</param>
+        public HttpResponse GetMessagesDetailReport(List<string> msgIdList)
+        {
+            Task<HttpResponse> task = Task.Run(() => GetMessagesDetailReportAsync(msgIdList));
+            task.Wait();
+            return task.Result;
+        }
+
+        /// <summary>
+        /// <see cref="GetUserReport(string, string, int)"/>
+        /// </summary>
+        public async Task<HttpResponse> GetUserReportAsync(string timeUnit, string startTime, int duration)
+        {
+            if (string.IsNullOrEmpty(timeUnit))
+                throw new ArgumentNullException(nameof(timeUnit));
+
+            if (startTime == null)
+                throw new ArgumentNullException(nameof(startTime));
+
+            if (duration <= 0)
+                throw new ArgumentOutOfRangeException(nameof(duration));
+
+            var url = BASE_URL + "/users?time_unit=" + timeUnit + "&start=" + startTime + "&duration=" + duration;
+            HttpResponseMessage msg = await JPushClient.HttpClient.GetAsync(url).ConfigureAwait(false);
+            var content = await msg.Content.ReadAsStringAsync().ConfigureAwait(false);
+            return new HttpResponse(msg.StatusCode, msg.Headers, content);
+        }
+
+        /// <summary>
+        /// 提供近2个月内某时间段的用户相关统计数据：新增用户、在线用户、活跃用户（VIP only）。
+        /// <see cref="https://docs.jiguang.cn/jpush/server/push/rest_api_v3_report/#vip_1"/>
+        /// </summary>
+        /// <param name="timeUnit">时间单位。支持 "HOUR", "DAY" 或 "MOUNTH"</param>
+        /// <param name="startTime">
+        ///     起始时间。
+        ///     <para>如果单位是小时，则起始时间是小时（包含天），格式例：2014-06-11 09</para>
+        ///     <para>如果单位是天，则起始时间是日期（天），格式例：2014-06-11</para>
+        ///     <para>如果单位是月，则起始时间是日期（月），格式例：2014-06</para>
+        /// </param>
+        /// <param name="duration">
+        ///     持续时长。
+        ///     <para>如果时间单位（timeUnit）是天，则是持续的天数，其他时间单位以此类推。</para>
+        ///     <para>只支持查询 60 天以内的用户信息。如果 timeUnit 为 HOUR，则只会输出当天的统计结果。</para>
+        /// </param>
+        public HttpResponse GetUserReport(string timeUnit, string startTime, int duration)
+        {
+            Task<HttpResponse> task = Task.Run(() => GetUserReportAsync(timeUnit, startTime, duration));
+            task.Wait();
+            return task.Result;
+        }
+    }
+}