Create a session

Configure session options and choose network connection types to add multiplayer support to your project.

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To start a multiplayer game, the host must create a session that other players join to participate in the game. A session represents a group of players that are connected together for a set period of time during a multiplayer game. This page outlines what you must include in your script to create a session.

注

To access the API for the Multiplayer Services SDK, import the SDK's namespace in your script:


using Unity.Services.Multiplayer;

The CreateOrJoinSessionAsync method

Use the

CreateOrJoinSessionAsync

method to do the following:

Join an existing session with the given ID.
Create a session if the ID doesn't exist.

CreateOrJoinSessionAsync

will create a session if it doesn't exist yet, while subsequent calls put users into the created session. This approach ensures that only one session is created when multiple clients attempt to join the same session, often referred to as race conditions.


  var session = await MultiplayerService.Instance.CreateOrJoinSessionAsync(sessionId, options)

Session options properties

The session options determine various properties of your session, such as the maximum number of players, or whether the session is password protected. Refer to

Class SessionOptions

for a full list of options.

Example: Creating a session with a client-hosted solution

The following example demonstrates how to create a session using a Unity client-hosted solution:


async Task StartSessionAsHost(){    var options = new SessionOptions    {      MaxPlayers = 2    }.WithRelayNetwork(); // or WithDistributedAuthorityNetwork() to use Distributed Authority instead of Relay    var session = await MultiplayerService.Instance.CreateSessionAsync(options);    Debug.Log($"Session {session.Id} created! Join code: {session.Code}");}

Note the following points from the previous code:

The variable
```
MaxPlayers
```
sets the maximum number of players allowed in the session, including the host. In this example, the maximum number of players is two.
The variable options of class
```
SessionOptions
```
can determine other session options, such as the session’s name, and whether it is password protected.
The use of
```
WithRelayNetwork()
```
(or
```
WithDistributedAuthorityNetwork()
```
) configures the session to use Relay (or Distributed Authority) networking rather than direct connections (in other words, with a fixed IP address and port). This is the recommended best practice for peer-to-peer connectivity over the Internet. Refer to Relay or Distributed Authority for more information.

The line

var session = await MultiplayerService.Instance.CreateSessionAsync(options);

creates the session, and makes the player the host.

The final line,
```
Debug.Log($"Session {session.Id} created! Join code: {session.Code}");
```
, displays the session ID and join code in the console of the Unity Editor. The host would then share this join code with the other players. Alternatively, you could create a variable to get the join code, as in
```
var joinCode = session.Code;
```
and use that variable instead.

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