Export a report from Telerik Report Server via .NET Client

Environment

Products

Progress® Telerik® Reporting, Report Server

Description

Telerik Report Server has its REST API exposed, allowing you to consume resources from third-party applications as an administrator, after logging in. You can find examples with JavaScript client in the REST API section of the online documentation:

• Login and saving the access token for further usage
• Resources - listing resources like reports available on the Report Server
• Export a report by getting its ID first

The same JavaScript client can be written as a .NET client that executes requests and handles their response in code.

The following solution demonstrates the following:

• How to Login to the Report Server through the .NET client;
• How to get a collection of all reports available on the report serve through the .NET client;
• How to export a report available on the report server through the .NET client;
• How to download the exported document through the .NET client;

Solution

class Program
   {
       static HttpClient client = new HttpClient();
       static string reportServerAddress = "http://localhost:83/";
       static string serverREStAPI = reportServerAddress + "api/reportserver/";
       static void Main(string[] args)
       {
           Console.WriteLine("Demo started");
           RunAsync().Wait();

           Console.WriteLine("Demo ended");
           Console.ReadLine();
       }

       static async Task RunAsync()
       {
           // Our .NET Client
           client.BaseAddress = new Uri(serverREStAPI);
           client.DefaultRequestHeaders.Accept.Clear();
           client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

           //log the user to allow further operations
           var userToken = LogIn("admin", "admin123");

           //authorize further requests
           client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", userToken);

           //list all reports
           var reports = await GetReportsAsync(serverREStAPI + "reports");

           //get document id for first report
           var firstReportId = reports[0]["Id"];
           var documentID = await ExportReportAsync(serverREStAPI + "documents", "PDF", firstReportId, "");


           //download PDF from documentID
           DownloadPDF(serverREStAPI + "documents/", documentID, false);
       }

       //log user
       static string LogIn(string usernameInput, string passwordInput)
       {
           var data = new FormUrlEncodedContent(new[]{
              new KeyValuePair<string, string>( "grant_type" ,"password" ),
               new KeyValuePair<string, string>( "username" , usernameInput ),
               new KeyValuePair<string, string>( "password" , passwordInput )
           });
           // "grant_type=password&username=" + usernameInput + "&password=" + passwordInput;

           HttpResponseMessage response = client.PostAsync(reportServerAddress + "Token", data).Result;
           response.EnsureSuccessStatusCode();

           var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
           dynamic result = serializer.DeserializeObject(response.Content.ReadAsStringAsync().Result);
           return result["access_token"];
       }

       //list categories
       static async Task<List<Dictionary<string, string>>> GetReportsAsync(string path)
       {
           List<Dictionary<string, string>> reports = null;


           HttpResponseMessage response = await client.GetAsync(path);
           if (response.IsSuccessStatusCode)
           {
               reports = await response.Content.ReadAsAsync<List<Dictionary<string, string>>>();
           }
           return reports;
       }

       //export in PDF a report
       static async Task<string> ExportReportAsync(string path, string format, string reportId, string parameterValuesJSONSerieliazed)
       {
           var data = new { ReportId = reportId, Format = format, ParameterValues = parameterValuesJSONSerieliazed };
           HttpResponseMessage response = await client.PostAsJsonAsync(path, data);
           response.EnsureSuccessStatusCode();

           var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
           dynamic result = serializer.DeserializeObject(response.Content.ReadAsStringAsync().Result);
           return result["DocumentId"];
       }

       //download PDF
       static void DownloadPDF(string path, string documentID, bool asAttachment)
       {
           var queryString = "";

           if (asAttachment)
           {
               queryString += "?content-disposition=attachment";
           }

           string fileName = "test1.pdf";
           string folderName = System.IO.Path.GetTempPath();
           string filePath = System.IO.Path.Combine(folderName, fileName);
           using (System.Net.WebClient myWebClient = new System.Net.WebClient())
           {
               myWebClient.DownloadFile(path + documentID + queryString, filePath);
           }

           System.Diagnostics.Process.Start(filePath);
       }
   }

Notes

Please note that this is not an end solution, but an example illustrating how to format a request to the Report Server and the type of information returned in responses. You can use any other client to submit requests and get responses by the Report Server.

See Also

REST API Reference

Displaying Reports From Report Server Through Custom Report Source Resolver