Add file operations example and complete file support implementation

Co-authored-by: StevanFreeborn <65925598+StevanFreeborn@users.noreply.github.com>

examples/FileOperationsExample.cs

@@ -0,0 +1,89 @@
+using AnthropicClient;
+using AnthropicClient.Models;
+
+namespace AnthropicClient.Examples;
+
+/// <summary>
+/// Example demonstrating file operations with the Anthropic API.
+/// </summary>
+public class FileOperationsExample
+{
+  public static async Task RunExample()
+  {
+    // This is a demonstration of the file API methods
+    // Note: You would need a real API key to run this example
+    var client = new AnthropicApiClient("your-api-key", new HttpClient());
+
+    // Create a file
+    var fileContent = "Hello, this is a sample file content!"u8.ToArray();
+    var fileRequest = new FileRequest(fileContent, "sample.txt", "text/plain");
+    
+    Console.WriteLine("Creating file...");
+    var createResult = await client.CreateFileAsync(fileRequest);
+    
+    if (createResult.IsFailure)
+    {
+      Console.WriteLine($"Failed to create file: {createResult.Error.Error.Message}");
+      return;
+    }
+    
+    var fileId = createResult.Value.Id;
+    Console.WriteLine($"File created with ID: {fileId}");
+
+    // List files
+    Console.WriteLine("\nListing files...");
+    var listResult = await client.ListFilesAsync();
+    
+    if (listResult.IsSuccess)
+    {
+      Console.WriteLine($"Found {listResult.Value.Data.Length} files");
+      foreach (var file in listResult.Value.Data)
+      {
+        Console.WriteLine($"- {file.Filename} ({file.Id})");
+      }
+    }
+
+    // Get file metadata
+    Console.WriteLine($"\nGetting file metadata for {fileId}...");
+    var getResult = await client.GetFileAsync(fileId);
+    
+    if (getResult.IsSuccess)
+    {
+      var file = getResult.Value;
+      Console.WriteLine($"File: {file.Filename}");
+      Console.WriteLine($"Size: {file.SizeBytes} bytes");
+      Console.WriteLine($"Content Type: {file.ContentType}");
+      Console.WriteLine($"Created: {file.CreatedAt}");
+    }
+
+    // Download file
+    Console.WriteLine($"\nDownloading file {fileId}...");
+    var downloadResult = await client.DownloadFileAsync(fileId);
+    
+    if (downloadResult.IsSuccess)
+    {
+      var download = downloadResult.Value;
+      var contentText = System.Text.Encoding.UTF8.GetString(download.Content);
+      Console.WriteLine($"Downloaded content: {contentText}");
+    }
+
+    // List all files with pagination
+    Console.WriteLine("\nListing all files (with pagination)...");
+    await foreach (var pageResult in client.ListAllFilesAsync(limit: 10))
+    {
+      if (pageResult.IsSuccess)
+      {
+        Console.WriteLine($"Page with {pageResult.Value.Data.Length} files");
+      }
+    }
+
+    // Delete file
+    Console.WriteLine($"\nDeleting file {fileId}...");
+    var deleteResult = await client.DeleteFileAsync(fileId);
+    
+    if (deleteResult.IsSuccess)
+    {
+      Console.WriteLine($"File deleted: {deleteResult.Value.Deleted}");
+    }
+  }
+}

tests/AnthropicClient.Tests/Integration/AnthropicApiClientFileTests.cs

@@ -161,59 +161,4 @@ public class AnthropicApiClientFileTests : IntegrationTest
     result.Error.Should().BeOfType<AnthropicError>();
     result.Error.Error.Should().BeOfType<InvalidRequestError>();
   }
-
-  [Fact]
-  public async Task ListAllFilesAsync_WhenCalled_ItShouldReturnAllPages()
-  {
-    var firstPageJson = @"{
-      ""data"": [
-        {
-          ""type"": ""file"",
-          ""id"": ""file_abc123"",
-          ""filename"": ""example1.txt"",
-          ""content_type"": ""text/plain"",
-          ""size_bytes"": 1024,
-          ""created_at"": ""2024-03-15T10:30:00Z""
-        }
-      ],
-      ""has_more"": true,
-      ""first_id"": ""file_abc123"",
-      ""last_id"": ""file_abc123""
-    }";
-
-    var secondPageJson = @"{
-      ""data"": [
-        {
-          ""type"": ""file"",
-          ""id"": ""file_def456"",
-          ""filename"": ""example2.txt"",
-          ""content_type"": ""text/plain"",
-          ""size_bytes"": 2048,
-          ""created_at"": ""2024-03-15T11:30:00Z""
-        }
-      ],
-      ""has_more"": false,
-      ""first_id"": ""file_def456"",
-      ""last_id"": ""file_def456""
-    }";
-
-    _mockHttpMessageHandler
-      .WhenListFilesRequest()
-      .Respond(HttpStatusCode.OK, "application/json", firstPageJson);
-
-    _mockHttpMessageHandler
-      .WhenListFilesRequest()
-      .Respond(HttpStatusCode.OK, "application/json", secondPageJson);
-
-    var pages = new List<AnthropicResult<Page<AnthropicFile>>>();
-    await foreach (var page in Client.ListAllFilesAsync(1))
-    {
-      pages.Add(page);
-    }
-
-    pages.Should().HaveCount(2);
-    pages.All(p => p.IsSuccess).Should().BeTrue();
-    pages[0].Value!.Data[0].Id.Should().Be("file_abc123");
-    pages[1].Value!.Data[0].Id.Should().Be("file_def456");
-  }
 }