FileWork examples were added

DataAccess/FileDialogs/FileRepository.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataAccess.FileDialogs
+{
+    using System;
+    using System.IO;
+    using System.Threading.Tasks;
+
+    public class FileRepository : IFileRepository
+    {
+        private readonly string _storageDirectory;
+
+        public FileRepository(string storageDirectory)
+        {
+            _storageDirectory = storageDirectory;
+
+            // Ensure the storage directory exists
+            if (!Directory.Exists(_storageDirectory))
+            {
+                Directory.CreateDirectory(_storageDirectory);
+            }
+        }
+
+        // Save a file to the repository
+        public async Task SaveFileAsync(Stream fileStream, string fileName)
+        {
+            string filePath = Path.Combine(_storageDirectory, fileName);
+
+            // Ensure the file does not already exist
+            if (File.Exists(filePath))
+            {
+                throw new InvalidOperationException("File already exists.");
+            }
+
+            using (var file = new FileStream(filePath, FileMode.Create, FileAccess.Write))
+            {
+                await fileStream.CopyToAsync(file);
+            }
+        }
+
+        // Retrieve a file from the repository
+        public async Task<Stream> GetFileAsync(string fileName)
+        {
+            string filePath = Path.Combine(_storageDirectory, fileName);
+
+            // Ensure the file exists
+            if (!File.Exists(filePath))
+            {
+                throw new FileNotFoundException("File not found.");
+            }
+
+            var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
+            return await Task.FromResult(fileStream);
+        }
+
+        // Update an existing file in the repository
+        public async Task UpdateFileAsync(Stream fileStream, string fileName)
+        {
+            string filePath = Path.Combine(_storageDirectory, fileName);
+
+            // Ensure the file exists
+            if (!File.Exists(filePath))
+            {
+                throw new FileNotFoundException("File not found.");
+            }
+
+            using (var file = new FileStream(filePath, FileMode.Truncate, FileAccess.Write))
+            {
+                await fileStream.CopyToAsync(file);
+            }
+        }
+
+        // Delete a file from the repository
+        public async Task DeleteFileAsync(string fileName)
+        {
+            string filePath = Path.Combine(_storageDirectory, fileName);
+
+            // Ensure the file exists
+            if (!File.Exists(filePath))
+            {
+                throw new FileNotFoundException("File not found.");
+            }
+
+            File.Delete(filePath);
+            await Task.CompletedTask;
+        }
+    }
+
+}