BeWoPlaner/Service/ServiceImplementations/ApiStreamServiceImp.cs

using BeWo.Data.Access;
using BeWo.Service.ServiceContracts;
using BS.Shared.Core;
using BS.Shared.DataContracts.AdminService;
using BS.Shared.DataContracts.MikePHPContracts;
using DevExpress.Pdf.Native.BouncyCastle.Ocsp;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using System.Threading.Tasks;

namespace BeWo.Service.ServiceImplementations
{
	[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Single)]
	public class ApiStreamServiceImp : IApiStreamService
	{
		public Stream DownloadReport()
		{
			string filename = "xrechnung.pdf";

			string filePath = Path.Combine(@"C:\Users\ownSoft\Desktop\XRechnung\", filename);
			if (!File.Exists(filePath))
				throw new FileNotFoundException("Datei nicht gefunden");

			// Setze die Header
			WebOperationContext.Current.OutgoingResponse.ContentType = "application/pdf";
			WebOperationContext.Current.OutgoingResponse.Headers.Add(
				"Content-Disposition", $"attachment; filename=\"{filename}\"");

			FileStream f = new FileStream(filePath, FileMode.Open);
			int length = (int)f.Length;
			WebOperationContext.Current.OutgoingResponse.ContentLength = length;
			byte[] buffer = new byte[length];
			int sum = 0;
			int count;
			while ((count = f.Read(buffer, sum, length - sum)) > 0)
			{
				sum += count;
			}
			f.Close();
			return new MemoryStream(buffer);
		}
	}
}