Generate SSRS report using WCF in .NET Core Application

Program.cs

using ServiceReference1;
using System;
using System.Collections.Generic;
using System.IO;
using System.ServiceModel;
using System.Threading.Tasks;

namespace SSRSSimple
{
    class Program
    {
        const string ReportExecution2005EndPointUrl = "https://YourServer.com/ReportServer/ReportExecution2005.asmx";
        const string SsrsServiceAccountActiveDirectoryUserName = "someActiveDirectoryNameWithoutDomain";
        const string SsrsServiceAccountActiveDirectoryPassword = "somePassword";
        const string SsrsServiceAccountActiveDirectoryDomain = "someDomain";
        const string ReportPath = "/ProjectName/Reports/Report_Overview_Basic_Without_Rdl_Extension";
        const string ReportWidth = "8.5in";
        const string ReportHeight = "11in";
        const string ReportFormat = "PDF";  // Other options include WORDOPENXML and EXCELOPENXML
        const string HistoryId = null;

        static void Main(string[] args)
        {

            RunReport().Wait();

            Console.WriteLine("DONE !");
        }

        private static async Task RunReport()
        {
            ReportExecutionServiceSoapClient rs = CreateClient();
            var trustedHeader = new TrustedUserHeader();

            LoadReportResponse loadReponse = await LoadReport(rs, trustedHeader);

            await AddParametersToTheReport(rs, loadReponse.ExecutionHeader, trustedHeader);

            RenderResponse response = await RenderReportByteArrayAsync(loadReponse.ExecutionHeader, trustedHeader, rs, ReportFormat, ReportWidth, ReportHeight);

            SaveResultToFile(response.Result, "SomeFileName.pdf");
        }

        private static async Task<LoadReportResponse> LoadReport(ReportExecutionServiceSoapClient rs, TrustedUserHeader trustedHeader)
        {
            // Get the report and set the execution header.
            // Failure to set the execution header will result in this error: "The session identifier is missing. A session identifier is required for this operation."
            // See https://social.msdn.microsoft.com/Forums/sqlserver/en-US/17199edb-5c63-4815-8f86-917f09809504/executionheadervalue-missing-from-reportexecutionservicesoapclient
            LoadReportResponse loadReponse = await rs.LoadReportAsync(trustedHeader, ReportPath, HistoryId);

            return loadReponse;
        }

        private static async Task<SetExecutionParametersResponse> AddParametersToTheReport(ReportExecutionServiceSoapClient rs, ExecutionHeader executionHeader, TrustedUserHeader trustedHeader)
        {
            // Add parameters to the report
            var reportParameters = new List<ParameterValue>();
            reportParameters.Add(new ParameterValue() { Name = "ProjectID", Value = "1434" });
            reportParameters.Add(new ParameterValue() { Name = "GeographyID", Value = "6071" });
            reportParameters.Add(new ParameterValue() { Name = "Radius", Value = "20" });
            reportParameters.Add(new ParameterValue() { Name = "PreparedBy", Value = "Dave" });
            reportParameters.Add(new ParameterValue() { Name = "PreparedFor", Value = "Someone special" });
            reportParameters.Add(new ParameterValue() { Name = "CurrencyId", Value = "142" });
            
            SetExecutionParametersResponse setParamsResponse = await rs.SetExecutionParametersAsync(executionHeader, trustedHeader, reportParameters.ToArray(), "en-US");

            return setParamsResponse;
        }

        private static async Task<RenderResponse> RenderReportByteArrayAsync(ExecutionHeader execHeader, TrustedUserHeader trustedHeader,
           ReportExecutionServiceSoapClient rs, string format, string width, string height)
        {
            string deviceInfo = String.Format("<DeviceInfo><PageHeight>{0}</PageHeight><PageWidth>{1}</PageWidth><PrintDpiX>300</PrintDpiX><PrintDpiY>300</PrintDpiY></DeviceInfo>", height, width);

            var renderRequest = new RenderRequest(execHeader, trustedHeader, format, deviceInfo);

            //get report bytes
            RenderResponse response = await rs.RenderAsync(renderRequest);
            return response;
        }


        private static ReportExecutionServiceSoapClient CreateClient()
        {
            var rsBinding = new BasicHttpBinding();
            rsBinding.Security.Mode = BasicHttpSecurityMode.Transport;
            rsBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Windows;

            // So we can download reports bigger than 64 KBytes
            // See https://stackoverflow.com/questions/884235/wcf-how-to-increase-message-size-quota
            rsBinding.MaxBufferPoolSize = 20000000; 
            rsBinding.MaxBufferSize = 20000000;
            rsBinding.MaxReceivedMessageSize = 20000000;
            
            var rsEndpointAddress = new EndpointAddress(ReportExecution2005EndPointUrl);
            var rsClient = new ReportExecutionServiceSoapClient(rsBinding, rsEndpointAddress);

            // Set user name and password
            rsClient.ClientCredentials.Windows.AllowedImpersonationLevel = System.Security.Principal.TokenImpersonationLevel.Impersonation;
            rsClient.ClientCredentials.Windows.ClientCredential = new System.Net.NetworkCredential(
                SsrsServiceAccountActiveDirectoryUserName, 
                SsrsServiceAccountActiveDirectoryPassword, 
                SsrsServiceAccountActiveDirectoryDomain);


            return rsClient;
        }

        private static void SaveResultToFile(byte[] result, string fileName)
        {
            using (var fs = File.OpenWrite($"c:\\temp\\{fileName}"))
            using (var sw = new StreamWriter(fs))
            {
                fs.Write(result);
            }
        }
    }
}

Thank you so much for this code example together with the helpful advice from @Seany84 about security mode and credential type! I was able to render the PDF and save it successfully :) (using .NET 8 at the moment)

Thank you so much for this! Absolute genius, saved me so much time!!