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docs(ui): add Output Window documentation
Add comprehensive documentation for working with the Output Window: - Quick start with Community Toolkit - Creating custom output panes - Writing to built-in panes (General, Build, Debug) - Built-in pane GUIDs reference - Thread-safe vs standard output methods - Pane configuration options - Showing and activating panes - Complete reusable logger example - Best practices Closes #43
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‎src/content/docs/output-window.mdx‎

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---
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title: Output Window
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description: Learn how to create custom output panes and write messages to the Output window.
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category: fundamentals
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order: 8
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---
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import Callout from '@components/Callout.astro';
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The Output window displays status messages, build output, debug information, and other runtime text. Extensions can create custom output panes to display their own messages.
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## Quick Start with Community Toolkit
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The simplest way to write to the Output window:
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```csharp
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// Write to the General pane
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await VS.Windows.WriteToOutputWindowAsync("Hello from my extension!");
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// Write to a custom pane (created if it doesn't exist)
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var pane = await VS.Windows.CreateOutputWindowPaneAsync("My Extension");
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await pane.WriteLineAsync("Extension initialized successfully");
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```
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## Creating a Custom Output Pane
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### With Community Toolkit
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```csharp
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public class MyExtension
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{
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private OutputWindowPane _pane;
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public async Task InitializeAsync()
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{
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// Create or get existing pane
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_pane = await VS.Windows.CreateOutputWindowPaneAsync("My Extension");
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}
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public async Task LogAsync(string message)
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{
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await _pane.WriteLineAsync($"[{DateTime.Now:HH:mm:ss}] {message}");
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}
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public async Task LogErrorAsync(string error)
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{
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await _pane.WriteLineAsync($"ERROR: {error}");
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await _pane.ActivateAsync(); // Bring pane to front
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}
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}
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```
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### Traditional Approach
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```csharp
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public class OutputPaneManager
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{
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private static readonly Guid PaneGuid = new Guid("YOUR-GUID-HERE");
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private IVsOutputWindowPane _pane;
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public async Task InitializeAsync(AsyncPackage package)
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{
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await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();
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var outputWindow = await package.GetServiceAsync(typeof(SVsOutputWindow)) as IVsOutputWindow;
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// Create the pane
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outputWindow.CreatePane(
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ref PaneGuid,
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"My Extension",
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fInitVisible: 1,
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fClearWithSolution: 1);
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outputWindow.GetPane(ref PaneGuid, out _pane);
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}
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public void WriteLine(string message)
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{
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ThreadHelper.ThrowIfNotOnUIThread();
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_pane?.OutputStringThreadSafe($"{message}{Environment.NewLine}");
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}
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public void Activate()
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{
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ThreadHelper.ThrowIfNotOnUIThread();
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_pane?.Activate();
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}
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public void Clear()
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{
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ThreadHelper.ThrowIfNotOnUIThread();
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_pane?.Clear();
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}
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}
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```
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## Writing to Built-in Panes
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Visual Studio has several built-in output panes you can write to:
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### General Pane
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```csharp
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// Community Toolkit
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await VS.Windows.WriteToOutputWindowAsync("Message to General pane");
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// Traditional
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var outputWindow = (IVsOutputWindow)GetService(typeof(SVsOutputWindow));
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var generalPaneGuid = VSConstants.GUID_OutWindowGeneralPane;
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outputWindow.GetPane(ref generalPaneGuid, out var generalPane);
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generalPane.OutputStringThreadSafe("Message to General pane\n");
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```
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### Build Pane
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```csharp
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var buildPaneGuid = VSConstants.GUID_BuildOutputWindowPane;
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outputWindow.GetPane(ref buildPaneGuid, out var buildPane);
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buildPane.OutputStringThreadSafe("Build message\n");
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```
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### Debug Pane
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```csharp
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var debugPaneGuid = VSConstants.GUID_OutWindowDebugPane;
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outputWindow.GetPane(ref debugPaneGuid, out var debugPane);
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debugPane.OutputStringThreadSafe("Debug message\n");
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```
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## Built-in Pane GUIDs
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| Pane | GUID | Constant |
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|------|------|----------|
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| General | `{65482C72-DEFA-41B7-902C-11C091889C83}` | `VSConstants.GUID_OutWindowGeneralPane` |
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| Build | `{1BD8A850-02D1-11D1-BEE7-00A0C913D1F8}` | `VSConstants.GUID_BuildOutputWindowPane` |
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| Debug | `{FC076020-078A-11D1-A7DF-00A0C9110051}` | `VSConstants.GUID_OutWindowDebugPane` |
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## Output Methods
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### OutputStringThreadSafe vs OutputString
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```csharp
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// Thread-safe - can be called from any thread
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pane.OutputStringThreadSafe("Safe from any thread\n");
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// Must be on UI thread
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await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();
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pane.OutputString("Must be on UI thread\n");
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```
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<Callout type="tip">
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Always prefer `OutputStringThreadSafe` unless you need special formatting or are already on the UI thread.
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</Callout>
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### Formatted Output
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```csharp
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// Add timestamp prefix
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public void Log(string message)
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{
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var timestamp = DateTime.Now.ToString("HH:mm:ss.fff");
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_pane.OutputStringThreadSafe($"[{timestamp}] {message}\n");
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}
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// Log levels
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public void LogInfo(string message) => Log($"INFO: {message}");
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public void LogWarning(string message) => Log($"WARN: {message}");
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public void LogError(string message) => Log($"ERROR: {message}");
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```
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## Pane Options
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When creating a pane, you can configure its behavior:
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```csharp
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outputWindow.CreatePane(
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ref paneGuid,
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"My Extension",
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fInitVisible: 1, // 1 = visible in dropdown, 0 = hidden until first write
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fClearWithSolution: 1 // 1 = clear when solution closes, 0 = preserve content
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);
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```
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| Parameter | Values | Description |
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|-----------|--------|-------------|
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| `fInitVisible` | 0 or 1 | Whether pane appears in dropdown before first write |
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| `fClearWithSolution` | 0 or 1 | Whether to clear content when solution closes |
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## Showing and Activating
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```csharp
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// Show the Output window (bring to front)
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await VS.Windows.ShowOutputWindowAsync();
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// Activate your specific pane
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await pane.ActivateAsync();
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// Traditional approach
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var outputWindow = (IVsOutputWindow)GetService(typeof(SVsOutputWindow));
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outputWindow.GetPane(ref paneGuid, out var pane);
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pane.Activate();
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// Show Output window via UI shell
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var uiShell = (IVsUIShell)GetService(typeof(SVsUIShell));
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var outputWindowGuid = new Guid("{34E76E81-EE4A-11D0-AE2E-00A0C90FFFC3}");
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uiShell.FindToolWindow((uint)__VSFINDTOOLWIN.FTW_fForceCreate, ref outputWindowGuid, out var frame);
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frame.Show();
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```
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## Complete Example
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A reusable logging service for your extension:
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```csharp
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using System;
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using System.Threading.Tasks;
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using Community.VisualStudio.Toolkit;
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using Microsoft.VisualStudio.Shell;
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public interface IExtensionLogger
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{
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Task LogAsync(string message);
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Task LogWarningAsync(string message);
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Task LogErrorAsync(string message);
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Task ClearAsync();
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}
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public class ExtensionLogger : IExtensionLogger
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{
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private readonly string _paneName;
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private OutputWindowPane _pane;
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public ExtensionLogger(string paneName)
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{
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_paneName = paneName;
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}
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private async Task EnsurePaneAsync()
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{
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_pane ??= await VS.Windows.CreateOutputWindowPaneAsync(_paneName);
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}
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public async Task LogAsync(string message)
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{
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await EnsurePaneAsync();
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await _pane.WriteLineAsync($"[{DateTime.Now:HH:mm:ss}] {message}");
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}
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public async Task LogWarningAsync(string message)
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{
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await EnsurePaneAsync();
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await _pane.WriteLineAsync($"[{DateTime.Now:HH:mm:ss}] ⚠ WARNING: {message}");
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}
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public async Task LogErrorAsync(string message)
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{
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await EnsurePaneAsync();
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await _pane.WriteLineAsync($"[{DateTime.Now:HH:mm:ss}] ❌ ERROR: {message}");
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await _pane.ActivateAsync();
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}
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public async Task ClearAsync()
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{
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await EnsurePaneAsync();
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await _pane.ClearAsync();
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}
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}
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// Usage in your package
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public sealed class MyPackage : ToolkitPackage
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{
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public static IExtensionLogger Logger { get; private set; }
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protected override async Task InitializeAsync(CancellationToken cancellationToken, IProgress<ServiceProgressData> progress)
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{
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await base.InitializeAsync(cancellationToken, progress);
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Logger = new ExtensionLogger("My Extension");
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await Logger.LogAsync("Extension loaded successfully");
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}
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}
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// Usage anywhere in your extension
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await MyPackage.Logger.LogAsync("Processing file...");
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await MyPackage.Logger.LogErrorAsync("Failed to process file");
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```
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## Best Practices
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1. **Use descriptive pane names** - Make it clear which extension owns the pane
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2. **Add timestamps** - Helps users understand when events occurred
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3. **Use thread-safe methods** - Prefer `OutputStringThreadSafe` for background operations
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4. **Don't spam** - Only log meaningful information
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5. **Activate on errors** - Bring the pane to attention when something goes wrong
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6. **Clear appropriately** - Don't clear too often; users may want to scroll back
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<Callout type="warning">
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Avoid writing large amounts of text rapidly. This can freeze the UI. For high-volume logging, consider batching writes or using a separate log file.
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</Callout>
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## Deleting a Pane
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Remove a custom pane when it's no longer needed:
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```csharp
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var outputWindow = (IVsOutputWindow)GetService(typeof(SVsOutputWindow));
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var paneGuid = new Guid("YOUR-PANE-GUID");
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outputWindow.DeletePane(ref paneGuid);
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```
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<Callout type="note">
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You cannot delete built-in panes (General, Build, Debug).
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</Callout>
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## See Also
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- [Tool Windows](tool-windows) - Creating custom dockable windows
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- [Error List](error-list) - Displaying errors, warnings, and messages
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- [Status Bar](status-bar) - Brief status messages

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