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awesome-copilot/cookbook/copilot-sdk/dotnet/persisting-sessions.md
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Jon Galloway 1140812aaa Update .NET Copilot SDK cookbook for GitHub.Copilot.SDK 1.0 (#2021)
* Update .NET Copilot SDK cookbook for GitHub.Copilot.SDK 1.0

Align the dotnet copilot-sdk cookbook recipes and docs with the 1.0.1 release:

- Namespace GitHub.Copilot.SDK -> GitHub.Copilot

- MCP config uses Dictionary<string, McpServerConfig> + McpStdioServerConfig (drop Type discriminator)

- StopAsync no longer returns an error list; wrap graceful shutdown in try/catch

- GetMessagesAsync -> GetEventsAsync with event pattern matching

- LogLevel string -> CopilotLogLevel.Error enum

* Address PR review: clarify package/namespace, default event case, MCP stdio wording

- Note that the GitHub.Copilot.SDK package exposes the GitHub.Copilot namespace in each recipe

- Add a default case + note to the GetEventsAsync history example so other event kinds are not silently dropped

- Refine accessibility-report docs to describe a local stdio MCP server (McpStdioServerConfig via npx)

* Address re-review: add using for event types, note StopAsync throw behavior
2026-06-17 14:13:20 +10:00

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# Session Persistence and Resumption
Save and restore conversation sessions across application restarts.
## Example scenario
You want users to be able to continue a conversation even after closing and reopening your application.
> **Runnable example:** [recipe/persisting-sessions.cs](recipe/persisting-sessions.cs)
>
> ```bash
> cd recipe
> dotnet run persisting-sessions.cs
> ```
### Creating a session with a custom ID
```csharp
using GitHub.Copilot;
await using var client = new CopilotClient();
await client.StartAsync();
// Create session with a memorable ID
var session = await client.CreateSessionAsync(new SessionConfig
{
SessionId = "user-123-conversation",
Model = "gpt-5",
OnPermissionRequest = PermissionHandler.ApproveAll
});
await session.SendAsync(new MessageOptions { Prompt = "Let's discuss TypeScript generics" });
// Session ID is preserved
Console.WriteLine(session.SessionId); // "user-123-conversation"
// Destroy session but keep data on disk
await session.DisposeAsync();
await client.StopAsync();
```
### Resuming a session
```csharp
await using var client = new CopilotClient();
await client.StartAsync();
// Resume the previous session
var session = await client.ResumeSessionAsync("user-123-conversation", new ResumeSessionConfig { OnPermissionRequest = PermissionHandler.ApproveAll });
// Previous context is restored
await session.SendAsync(new MessageOptions { Prompt = "What were we discussing?" });
await session.DisposeAsync();
await client.StopAsync();
```
### Listing available sessions
```csharp
var sessions = await client.ListSessionsAsync();
foreach (var s in sessions)
{
Console.WriteLine($"Session: {s.SessionId}");
}
```
### Deleting a session permanently
```csharp
// Remove session and all its data from disk
await client.DeleteSessionAsync("user-123-conversation");
```
### Getting session history
Retrieve all events from a session:
```csharp
using GitHub.Copilot; // UserMessageEvent, AssistantMessageEvent, etc. live in this namespace
var events = await session.GetEventsAsync();
foreach (var evt in events)
{
switch (evt)
{
case UserMessageEvent user:
Console.WriteLine($"[user] {user.Data.Content}");
break;
case AssistantMessageEvent assistant:
Console.WriteLine($"[assistant] {assistant.Data.Content}");
break;
default:
// Sessions can also contain other events (tool calls, tool results, system events).
Console.WriteLine($"[{evt.GetType().Name}]");
break;
}
}
```
> A session's event stream may include event kinds beyond user and assistant messages
> (for example tool calls, tool results, and system events). Handle the ones you care
> about and fall back to a default case so nothing is silently dropped.
## Best practices
1. **Use meaningful session IDs**: Include user ID or context in the session ID
2. **Handle missing sessions**: Check if a session exists before resuming
3. **Clean up old sessions**: Periodically delete sessions that are no longer needed