Add receipt generation and file handling methods

Updated CafeController.cs to include System.Text and modified HandleReceipt to generate a receipt using StringBuilder, converting it to a MemoryStream, and returning it as "receipt.txt". Added System.IO to BotControllerBase.cs and introduced a new File method to return a FileResult object.

Author: bvdcode

Sources/TelegramBot.ConsoleTest/Controllers/CafeController.cs

@@ -3,6 +3,7 @@
 using TelegramBot.Attributes;
 using TelegramBot.Controllers;
 using TelegramBot.Abstractions;
+using System.Text;
 
 namespace TelegramBot.ConsoleTest.Controllers
 {
@@ -73,7 +74,15 @@ public async Task<IActionResult> HandleBurgersDoneAsync()
         [TextCommand("/receipt")]
         public IActionResult HandleReceipt()
         {
-
+            StringBuilder stringBuilder = new();
+            stringBuilder.AppendLine("Date: 2021-09-01");
+            stringBuilder.AppendLine("Time: 12:00");
+            stringBuilder.AppendLine("Order: 2x Vadim's Burger");
+            stringBuilder.AppendLine("Total: $10.00");
+            stringBuilder.AppendLine("Payment method: Cash");
+            stringBuilder.AppendLine("Thank you for your order!");
+            MemoryStream fileStream = new(Encoding.UTF8.GetBytes(stringBuilder.ToString()));
+            return File(fileStream, "receipt.txt");
         }
     }
 }

Sources/TelegramBot/Controllers/BotControllerBase.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Linq;
 using Telegram.Bot;
 using Telegram.Bot.Types;
@@ -111,6 +112,17 @@ public IActionResult File(string filePath)
             return new FileResult(filePath);
         }
 
+        /// <summary>
+        /// Sends a file to the sender.
+        /// </summary>
+        /// <param name="stream">Stream with file content.</param>
+        /// <param name="fileName">File name.</param>
+        /// <param name="disposeStream">Dispose the stream after sending the file.</param>
+        public IActionResult File(Stream stream, string fileName, bool disposeStream = true)
+        {
+            return new FileResult(stream, fileName, disposeStream);
+        }
+
         /// <summary>
         /// Deletes message from the current update, or does nothing if the message identifier is not found.
         /// <br/>