通过C#代码调用Dynamics 365 Web API执行批量操作

我是微软Dynamics 365 & Power Platform方面的工程师罗勇，也是2015年7月到2018年6月连续三年Dynamics CRM/Business Solutions方面的微软最有价值专家(Microsoft MVP)，欢迎关注我的微信公众号 MSFTDynamics365erLuoYong ，回复356或者20190830可方便获取本文，同时可以在第一间得到我发布的最新博文信息，follow me!

之前的文章 使用JS通过Web API执行批量操作，多个操作是一个事务！ 讲的是JavaScript的做法，今天我实验了一阵子终于搞定了C#做法。

不多说，上代码，这个代码的用途简单，就是新建一个注释，然后将某个注释的stepid字段值设置为Y，两个操作做成一个事务：

        private static async Task<string> ExecuteBatch(string ODataBaseUrl)
        {
            Guid batchId = Guid.NewGuid();
            Guid changesetId = Guid.NewGuid();
            string returnVal = string.Empty;
            StringBuilder requestBody = new StringBuilder();
            requestBody.Append($"--batch_{batchId}");
            requestBody.Append("\n");
            requestBody.Append($"Content-Type: multipart/mixed;boundary=changeset_{changesetId}");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"--changeset_{changesetId}");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/http");
            requestBody.Append("\n");
            requestBody.Append("Content-Transfer-Encoding:binary");
            requestBody.Append("\n");
            requestBody.Append("Content-ID: 1");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"POST {ODataBaseUrl}annotations HTTP/1.1");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/json;type=entry");
            requestBody.Append("\n");
            requestBody.Append("\n");
            JObject jObject = new JObject(
                    new JProperty("subject", "克隆出来的记录"),
                    new JProperty("filename", "MSFTDynamics365erLuoYong.jpg"),
                    new JProperty("filesize", ),
                    new JProperty("documentbody", "/9j/4AAQSkZJRgAB2cFFABRRRQAUUUUAf//Z"
            requestBody.Append("\n");
            requestBody.Append($"--changeset_{changesetId}");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/http");
            requestBody.Append("\n");
            requestBody.Append("Content-Transfer-Encoding:binary");
            requestBody.Append("\n");
            requestBody.Append("Content-ID: 2");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"PUT {ODataBaseUrl}annotations(4B502B89-4520-E911-B0C6-E05D5152C120)/stepid HTTP/1.1");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/json;type=entry");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append("{\"value\":\"Y\"}");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"--changeset_{changesetId}--");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"--batch_{batchId}--");
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create($"{ODataBaseUrl}$batch");
            request.Credentials = new NetworkCredential(ConfigurationManager.AppSettings["userName"], ConfigurationManager.AppSettings["passWord"]);
            request.Method = "POST";
            request.ContentType = $"multipart/mixed;boundary=batch_{batchId}";
            request.Accept = "application/json";
            request.Headers.Add("OData-MaxVersion", "4.0");
            request.Headers.Add("OData-Version", "4.0");
            byte[] buffer = Encoding.UTF8.GetBytes(requestBody.ToString());
            request.ContentLength = buffer.Length;
            using (Stream stream = await request.GetRequestStreamAsync())
            {
                stream.Write(buffer, , buffer.Length);
                stream.Flush();
            }
            using (WebResponse response = await request.GetResponseAsync())
            {
                var webResponse = response as HttpWebResponse;
                if (webResponse.StatusCode == HttpStatusCode.OK)
                {
                    Stream Answer = response.GetResponseStream();
                    StreamReader _Answer = new StreamReader(Answer);
                    returnVal = _Answer.ReadToEnd();
                }
                else
                {
                    throw new Exception($"Error. {webResponse.StatusCode}");
                }
            }
            return returnVal;
        }

我的执行效果如下，我这里是执行成功HTTP STATUS CODE = 200)后显示了返回内容：

如果改成用 HttpClient 来发起请求，代码如下，个人推荐使用这种：

        private static async Task<string> ExecuteBatch(string ODataBaseUrl)
        {
            Guid batchId = Guid.NewGuid();
            Guid changesetId = Guid.NewGuid();
            string returnVal = string.Empty;
            StringBuilder requestBody = new StringBuilder();
            requestBody.Append($"--batch_{batchId}");
            requestBody.Append("\n");
            requestBody.Append($"Content-Type: multipart/mixed;boundary=changeset_{changesetId}");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"--changeset_{changesetId}");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/http");
            requestBody.Append("\n");
            requestBody.Append("Content-Transfer-Encoding:binary");
            requestBody.Append("\n");
            requestBody.Append("Content-ID: 1");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"POST {ODataBaseUrl}annotations HTTP/1.1");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/json;type=entry");
            requestBody.Append("\n");
            requestBody.Append("\n");
            JObject jObject = new JObject(
                    new JProperty("subject", "克隆出来的记录"),
                    new JProperty("filename", "MSFTDynamics365erLuoYong.jpg"),
                    new JProperty("filesize", ),
                    new JProperty("documentbody", "/9j/4AAQSkZJRRRQAUUUUAf//Z"),
                    new JProperty("isdocument", true),
                    new JProperty("mimetype", "image/jpeg"),
                    new JProperty("notetext", "罗勇测试用的"),
                    new JProperty("objectid_account@odata.bind", "/accounts(C543D891-9FBD-E911-B0D1-8280A40FB795)")
                    );
            requestBody.Append(JsonConvert.SerializeObject(jObject));
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"--changeset_{changesetId}");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/http");
            requestBody.Append("\n");
            requestBody.Append("Content-Transfer-Encoding:binary");
            requestBody.Append("\n");
            requestBody.Append("Content-ID: 2");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"PUT {ODataBaseUrl}annotations(85412E8C-B08D-E911-B0C9-C8187530CEF1)/stepid HTTP/1.1");
            requestBody.Append("\n");
            requestBody.Append("Content-Type: application/json;type=entry");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append("{\"value\":\"Y\"}");
            requestBody.Append("\n");
            requestBody.Append("\n");
            requestBody.Append($"--changeset_{changesetId}--");
            NetworkCredential credentials = new NetworkCredential(ConfigurationManager.AppSettings["userName"], ConfigurationManager.AppSettings["passWord"]);
            HttpMessageHandler messageHandler = new HttpClientHandler()
            {
                Credentials = credentials
            };
            using (HttpClient httpClient = new HttpClient(messageHandler))
            {
                httpClient.DefaultRequestHeaders.Add("OData-MaxVersion", "4.0");
                httpClient.DefaultRequestHeaders.Add("OData-Version", "4.0");
                httpClient.DefaultRequestHeaders.Add("Accept", "application/json");
                MultipartContent mainContent = new MultipartContent("mixed", $"batch_{batchId.ToString().Replace("\"","")}");
                StringContent sc = new StringContent(requestBody.ToString());
                sc.Headers.Clear();
                sc.Headers.Add("Content-Type", $"multipart/mixed;boundary={changesetId.ToString()}");
                mainContent.Add(sc);
                var response = await httpClient.PostAsync($"{ODataBaseUrl}$batch", mainContent);
                if (response.IsSuccessStatusCode)
                {
                    returnVal = await response.Content.ReadAsStringAsync();
                }
                else
                {
                    var errorMsg = await response.Content.ReadAsStringAsync();
                    throw new Exception(errorMsg);
                }
                return returnVal;
            }
        }