Update DataResult.cs

- adding DownloadAudio
- adding an optional method for all available ones to save attachments directly to a file

TelegramBotBase/Base/DataResult.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -108,14 +109,49 @@ namespace TelegramBotBase.Base
             return new InputOnlineFile(encryptedContent, this.Document.FileName);
         }
 
+        public async Task DownloadDocument(String path)
+        {
+            var file = await this.Client.TelegramClient.GetFileAsync(this.Document.FileId);
+            FileStream fs = new FileStream(path, FileMode.Create);
+            await this.Client.TelegramClient.DownloadFileAsync(file.FilePath, fs);
+            fs.Close();
+            fs.Dispose();
+        }
+
         public async Task<InputOnlineFile> DownloadVideo()
         {
             var encryptedContent = new System.IO.MemoryStream(this.Video.FileSize);
             var file = await this.Client.TelegramClient.GetInfoAndDownloadFileAsync(this.Video.FileId, encryptedContent);
+            
+            return new InputOnlineFile(encryptedContent, "");
+        }
+
+        public async Task DownloadVideo(String path)
+        {
+            var file = await this.Client.TelegramClient.GetFileAsync(this.Video.FileId);
+            FileStream fs = new FileStream(path, FileMode.Create);
+            await this.Client.TelegramClient.DownloadFileAsync(file.FilePath, fs);
+            fs.Close();
+            fs.Dispose();
+        }
+
+        public async Task<InputOnlineFile> DownloadAudio()
+        {
+            var encryptedContent = new System.IO.MemoryStream(this.Audio.FileSize);
+            var file = await this.Client.TelegramClient.GetInfoAndDownloadFileAsync(this.Audio.FileId, encryptedContent);
 
             return new InputOnlineFile(encryptedContent, "");
         }
 
+        public async Task DownloadAudio(String path)
+        {
+            var file = await this.Client.TelegramClient.GetFileAsync(this.Audio.FileId);
+            FileStream fs = new FileStream(path, FileMode.Create);
+            await this.Client.TelegramClient.DownloadFileAsync(file.FilePath, fs);
+            fs.Close();
+            fs.Dispose();
+        }
+
         public async Task<InputOnlineFile> DownloadPhoto(int index)
         {
             var photo = this.Photos[index];
@@ -125,5 +161,15 @@ namespace TelegramBotBase.Base
             return new InputOnlineFile(encryptedContent, "");
         }
 
+        public async Task DownloadPhoto(int index, String path)
+        {
+            var photo = this.Photos[index];
+            var file = await this.Client.TelegramClient.GetFileAsync(photo.FileId);
+            FileStream fs = new FileStream(path, FileMode.Create);
+            await this.Client.TelegramClient.DownloadFileAsync(file.FilePath, fs);
+            fs.Close();
+            fs.Dispose();
+        }
+
     }
 }