Interface ISession

An interface that can be used by a client to access the information of a session.

Namespace: Unity.Services.Multiplayer

Assembly: Unity.Services.Multiplayer.dll

Syntax

public interface ISession

Properties

AvailableSlots

Available slots in the session

Declaration

int AvailableSlots { get; }

Property Value

Type	Description
int

Code

The join code of the session.

Declaration

string Code { get; }

Property Value

Type	Description
string

Remarks

Prefer this to ID when player-visible strings are needed. Unlike IDs, join codes are much shorter to type and avoid visually ambiguous characters.

ConcurrencyControlEnabled

Applies concurrency control by adding an If-match header with the latest version of the session to applicable session operations. When enabled, operations are only allowed if the latest version matches the current version on the server. Applies to the following operations:

• deleting a session
• removing a player from a session
• updating a session player
• updating a session information

Declaration

bool ConcurrencyControlEnabled { get; set; }

Property Value

Type	Description
bool

CurrentPlayer

The current player in the session.

Declaration

IPlayer CurrentPlayer { get; }

Property Value

Type	Description
IPlayer

HasPassword

True if the session has a password, false otherwise

Declaration

bool HasPassword { get; }

Property Value

Type	Description
bool

Host

PlayerID of the session host.

Declaration

string Host { get; }

Property Value

Type	Description
string

Id

The ID of the session.

Declaration

string Id { get; }

Property Value

Type	Description
string

Remarks

Unique within a project and environment. Sessions can be joined by Id.

See Also

JoinByIdAsync(string, JoinSessionOptions)

IsHost

Whether the current player is the host of the session.

Declaration

bool IsHost { get; }

Property Value

Type	Description
bool

IsLocked

Whether the session is locked.

Declaration

bool IsLocked { get; }

Property Value

Type	Description
bool

Remarks

Locked sessions cannot be joined by anyone.

See Also

IsLocked

IsMember

Returns whether the player is a member of the session

Declaration

bool IsMember { get; }

Property Value

Type	Description
bool

IsPrivate

Whether the session is private.

Declaration

bool IsPrivate { get; }

Property Value

Type	Description
bool

Remarks

Private sessions or not visible in queries and cannot be joined with quick-join. They can still be joined by ID or by Code.

See Also

IsPrivate

IsServer

Whether the local owner of the session handle is a server managing the session.

Declaration

bool IsServer { get; }

Property Value

Type	Description
bool

MaxPlayers

The total number of players allowed in the session, including the host.

Declaration

int MaxPlayers { get; }

Property Value

Type	Description
int

See Also

MaxPlayers

Name

The Name of the session.

Declaration

string Name { get; }

Property Value

Type	Description
string

Remarks

Does not have to be unique. Sessions can be filtered by name in a query.

See Also

Name

QuerySessionsOptions

Network

Retrieve the client network handle

Declaration

IClientSessionNetwork Network { get; }

Property Value

Type	Description
IClientSessionNetwork

PlayerCount

The player count of the session

Declaration

int PlayerCount { get; }

Property Value

Type	Description
int

Players

The list of players in the session

Declaration

IReadOnlyList<IReadOnlyPlayer> Players { get; }

Property Value

Type	Description
IReadOnlyList<IReadOnlyPlayer>

Properties

The properties of the session.

Declaration

IReadOnlyDictionary<string, SessionProperty> Properties { get; }

Property Value

Type	Description
IReadOnlyDictionary<string, SessionProperty>

Remarks

You can modify session properties via an IHostSession.
To obtain an IHostSession from an ISession call AsHost().

See Also

AsHost()

IHostSession

State

The current state of the session.

Declaration

SessionState State { get; }

Property Value

Type	Description
SessionState

Type

The type is a client-side key used to uniquely identify a session.

Declaration

string Type { get; }

Property Value

Type	Description
string

Methods

AsHost()

Returns a read-write handle to the session with host privileges.

Declaration

IHostSession AsHost()

Returns

Type	Description
IHostSession	A session with higher privileges.

Exceptions

Type	Condition
SessionException	Throws a Forbidden error when the caller is not the host.

GetPlayer(string)

Retrieves information about a session member player by their playerId.

Declaration

IReadOnlyPlayer GetPlayer(string playerId)

Parameters

Type	Name	Description
string	playerId	The ID of the player to retrieve.

Returns

Type	Description
IReadOnlyPlayer	The IReadOnlyPlayer instance if found; otherwise, null.

See Also

GetPlayer(string)

HasPlayer(string)

Checks if a player with the given playerId is in the session.

Declaration

bool HasPlayer(string playerId)

Parameters

Type	Name	Description
string	playerId	The player ID to check for session membership.

Returns

Type	Description
bool	true if the player is a member of the session; otherwise, false.

LeaveAsync()

Leaves the session.

Declaration

Task LeaveAsync()

Returns

Type	Description
Task	A task for the operation.

Remarks

This method will be called automatically when the application is quitting.

Exceptions

Type	Condition
SessionException	Thrown when called by a non-session-member. The Error property will be set to InvalidOperation.

ReconnectAsync()

Reconnects to the session.

Declaration

Task ReconnectAsync()

Returns

Type	Description
Task	A task for the operation.

Remarks

Reconnecting is necessary when a player has momentarily disconnected from the network but didn't gracefully leave the session.

Exceptions

Type	Condition
SessionException	Throws a SessionDeleted error when the session is already deleted.

RefreshAsync()

Refreshes the session data.

Declaration

Task RefreshAsync()

Returns

Type	Description
Task	A task for the operation.

Exceptions

Type	Condition
SessionException	Throws a SessionDeleted error when the session is already deleted.

SaveCurrentPlayerDataAsync()

Save changes to the current player.

Declaration

Task SaveCurrentPlayerDataAsync()

Returns

Type	Description
Task	A Task representing the asynchronous operation.

Events

Changed

Event that is invoked when the session changes.

Declaration

event Action Changed

Event Type

Type	Description
Action

Remarks

This includes any type of changes to the session (properties, players, etc.).

Deleted

Event that is invoked when the session is deleted.

Declaration

event Action Deleted

Event Type

Type	Description
Action

PlayerHasLeft

Event that is invoked when a player has left the session.

Declaration

event Action<string> PlayerHasLeft

Event Type

Type	Description
Action<string>

Remarks

The string parameter represents the ID of the player who has left. This event is called right after the session gets updated.

PlayerJoined

Event that is invoked when a player has joined the session.

Declaration

event Action<string> PlayerJoined

Event Type

Type	Description
Action<string>

Remarks

The string parameter represents the ID of the player who has joined. This event is called right after the session gets updated.

PlayerLeaving

Event that is invoked when a player is leaving the session.

Declaration

event Action<string> PlayerLeaving

Event Type

Type	Description
Action<string>

Remarks

The string parameter represents the ID of the player who is leaving. This event is called right before the session gets updated.

PlayerLeft

Event that is invoked when a player is leaving the session.

Declaration

[Obsolete("PlayerLeft has been deprecated. Use PlayerLeaving instead (UnityUpgradable) -> PlayerLeaving")]
event Action<string> PlayerLeft

Event Type

Type	Description
Action<string>

Remarks

The string parameter represents the ID of the player who is leaving. This event is called right before the session gets updated.

PlayerPropertiesChanged

Event that is invoked when player properties are changed.

Declaration

event Action PlayerPropertiesChanged

Event Type

Type	Description
Action

Remarks

If the properties are already up to date locally, this event will not trigger. Example: This will not trigger for the host after it updates the properties, as the changes are already reflected in the host's local session.

RemovedFromSession

Event that is invoked when the current player is removed from the session.

Declaration

event Action RemovedFromSession

Event Type

Type	Description
Action

SessionHostChanged

Event that is invoked when the session host changed.

Declaration

event Action<string> SessionHostChanged

Event Type

Type	Description
Action<string>

Remarks

The string parameter represents the ID of the new session host.

SessionMigrated

Event that is invoked when the session has finished migrating hosts.

Declaration

event Action SessionMigrated

Event Type

Type	Description
Action

SessionPropertiesChanged

Event that is invoked when session properties are changed.

Declaration

event Action SessionPropertiesChanged

Event Type

Type	Description
Action

Remarks

If the properties are already up to date locally, this event will not trigger. Example: This will not trigger for the host after it updates the properties, as the changes are already reflected in the host's local session.

StateChanged

Event that is invoked when the session state changes.

Declaration

event Action<SessionState> StateChanged

Event Type

Type	Description
Action<SessionState>

Remarks

The SessionState parameter represents the new state of the session.

Extension Methods

MatchmakerExtensions.GetMatchmakingResults(ISession)