Add copy constructors and Clone methods to the various .NET config option bags

dotnet/src/Types.cs

@@ -24,6 +24,34 @@ public enum ConnectionState
 
 public class CopilotClientOptions
 {
+    /// <summary>
+    /// Initializes a new instance of the <see cref="CopilotClientOptions"/> class.
+    /// </summary>
+    public CopilotClientOptions() { }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="CopilotClientOptions"/> class
+    /// by copying the properties of the specified instance.
+    /// </summary>
+    protected CopilotClientOptions(CopilotClientOptions? other)
+    {
+        if (other is null) return;
+
+        AutoRestart = other.AutoRestart;
+        AutoStart = other.AutoStart;
+        CliArgs = (string[]?)other.CliArgs?.Clone();
+        CliPath = other.CliPath;
+        CliUrl = other.CliUrl;
+        Cwd = other.Cwd;
+        Environment = other.Environment;
+        GithubToken = other.GithubToken;
+        Logger = other.Logger;
+        LogLevel = other.LogLevel;
+        Port = other.Port;
+        UseLoggedInUser = other.UseLoggedInUser;
+        UseStdio = other.UseStdio;
+    }
+
     /// <summary>
     /// Path to the Copilot CLI executable. If not specified, uses the bundled CLI from the SDK.
     /// </summary>
@@ -53,6 +81,17 @@ public class CopilotClientOptions
     /// Default: true (but defaults to false when GithubToken is provided).
     /// </summary>
     public bool? UseLoggedInUser { get; set; }
+
+    /// <summary>
+    /// Creates a shallow clone of this <see cref="CopilotClientOptions"/> instance.
+    /// </summary>
+    /// <remarks>
+    /// Mutable collection properties are copied into new collection instances so that modifications
+    /// to those collections on the clone do not affect the original.
+    /// Other reference-type properties (for example delegates and the logger) are not
+    /// deep-cloned; the original and the clone will share those objects.
+    /// </remarks>
+    public virtual CopilotClientOptions Clone() => new(this);
 }
 
 public class ToolBinaryResult
@@ -692,6 +731,42 @@ public class InfiniteSessionConfig
 
 public class SessionConfig
 {
+    /// <summary>
+    /// Initializes a new instance of the <see cref="SessionConfig"/> class.
+    /// </summary>
+    public SessionConfig() { }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="SessionConfig"/> class
+    /// by copying the properties of the specified instance.
+    /// </summary>
+    protected SessionConfig(SessionConfig? other)
+    {
+        if (other is null) return;
+
+        AvailableTools = other.AvailableTools is not null ? [.. other.AvailableTools] : null;
+        ConfigDir = other.ConfigDir;
+        CustomAgents = other.CustomAgents is not null ? [.. other.CustomAgents] : null;
+        DisabledSkills = other.DisabledSkills is not null ? [.. other.DisabledSkills] : null;
+        ExcludedTools = other.ExcludedTools is not null ? [.. other.ExcludedTools] : null;
+        Hooks = other.Hooks;
+        InfiniteSessions = other.InfiniteSessions;
+        McpServers = other.McpServers is not null
+            ? new Dictionary<string, object>(other.McpServers, other.McpServers.Comparer)
+            : null;
+        Model = other.Model;
+        OnPermissionRequest = other.OnPermissionRequest;
+        OnUserInputRequest = other.OnUserInputRequest;
+        Provider = other.Provider;
+        ReasoningEffort = other.ReasoningEffort;
+        SessionId = other.SessionId;
+        SkillDirectories = other.SkillDirectories is not null ? [.. other.SkillDirectories] : null;
+        Streaming = other.Streaming;
+        SystemMessage = other.SystemMessage;
+        Tools = other.Tools is not null ? [.. other.Tools] : null;
+        WorkingDirectory = other.WorkingDirectory;
+    }
+
     public string? SessionId { get; set; }
     public string? Model { get; set; }
 
@@ -769,10 +844,58 @@ public class SessionConfig
     /// When enabled (default), sessions automatically manage context limits and persist state.
     /// </summary>
     public InfiniteSessionConfig? InfiniteSessions { get; set; }
+
+    /// <summary>
+    /// Creates a shallow clone of this <see cref="SessionConfig"/> instance.
+    /// </summary>
+    /// <remarks>
+    /// Mutable collection properties are copied into new collection instances so that modifications
+    /// to those collections on the clone do not affect the original.
+    /// Other reference-type properties (for example provider configuration, system messages,
+    /// hooks, infinite session configuration, and delegates) are not deep-cloned; the original
+    /// and the clone will share those nested objects, and changes to them may affect both.
+    /// </remarks>
+    public virtual SessionConfig Clone() => new(this);
 }
 
 public class ResumeSessionConfig
 {
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ResumeSessionConfig"/> class.
+    /// </summary>
+    public ResumeSessionConfig() { }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ResumeSessionConfig"/> class
+    /// by copying the properties of the specified instance.
+    /// </summary>
+    protected ResumeSessionConfig(ResumeSessionConfig? other)
+    {
+        if (other is null) return;
+
+        AvailableTools = other.AvailableTools is not null ? [.. other.AvailableTools] : null;
+        ConfigDir = other.ConfigDir;
+        CustomAgents = other.CustomAgents is not null ? [.. other.CustomAgents] : null;
+        DisabledSkills = other.DisabledSkills is not null ? [.. other.DisabledSkills] : null;
+        DisableResume = other.DisableResume;
+        ExcludedTools = other.ExcludedTools is not null ? [.. other.ExcludedTools] : null;
+        Hooks = other.Hooks;
+        InfiniteSessions = other.InfiniteSessions;
+        McpServers = other.McpServers is not null
+            ? new Dictionary<string, object>(other.McpServers, other.McpServers.Comparer)
+            : null;
+        Model = other.Model;
+        OnPermissionRequest = other.OnPermissionRequest;
+        OnUserInputRequest = other.OnUserInputRequest;
+        Provider = other.Provider;
+        ReasoningEffort = other.ReasoningEffort;
+        SkillDirectories = other.SkillDirectories is not null ? [.. other.SkillDirectories] : null;
+        Streaming = other.Streaming;
+        SystemMessage = other.SystemMessage;
+        Tools = other.Tools is not null ? [.. other.Tools] : null;
+        WorkingDirectory = other.WorkingDirectory;
+    }
+
     /// <summary>
     /// Model to use for this session. Can change the model when resuming.
     /// </summary>
@@ -870,13 +993,54 @@ public class ResumeSessionConfig
     /// Infinite session configuration for persistent workspaces and automatic compaction.
     /// </summary>
     public InfiniteSessionConfig? InfiniteSessions { get; set; }
+
+    /// <summary>
+    /// Creates a shallow clone of this <see cref="ResumeSessionConfig"/> instance.
+    /// </summary>
+    /// <remarks>
+    /// Mutable collection properties are copied into new collection instances so that modifications
+    /// to those collections on the clone do not affect the original.
+    /// Other reference-type properties (for example provider configuration, system messages,
+    /// hooks, infinite session configuration, and delegates) are not deep-cloned; the original
+    /// and the clone will share those nested objects, and changes to them may affect both.
+    /// </remarks>
+    public virtual ResumeSessionConfig Clone() => new(this);
 }
 
 public class MessageOptions
 {
+    /// <summary>
+    /// Initializes a new instance of the <see cref="MessageOptions"/> class.
+    /// </summary>
+    public MessageOptions() { }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="MessageOptions"/> class
+    /// by copying the properties of the specified instance.
+    /// </summary>
+    protected MessageOptions(MessageOptions? other)
+    {
+        if (other is null) return;
+
+        Attachments = other.Attachments is not null ? [.. other.Attachments] : null;
+        Mode = other.Mode;
+        Prompt = other.Prompt;
+    }
+
     public string Prompt { get; set; } = string.Empty;
     public List<UserMessageDataAttachmentsItem>? Attachments { get; set; }
     public string? Mode { get; set; }
+
+    /// <summary>
+    /// Creates a shallow clone of this <see cref="MessageOptions"/> instance.
+    /// </summary>
+    /// <remarks>
+    /// Mutable collection properties are copied into new collection instances so that modifications
+    /// to those collections on the clone do not affect the original.
+    /// Other reference-type properties (for example attachment items) are not deep-cloned;
+    /// the original and the clone will share those nested objects.
+    /// </remarks>
+    public virtual MessageOptions Clone() => new(this);
 }
 
 public delegate void SessionEventHandler(SessionEvent sessionEvent);