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Send your first message

With Sendbird Chat SDK for .NET, you can efficiently integrate real-time chat into a client app. On the client-side implementation, you can initialize and configure the chat with minimal effort. On the server-side, Sendbird ensures reliable infra-management services for the chat service within your app.

This page demonstrates how to install the Chat SDK in your app so that you can send your first message in just a few simple steps.


Requirements

The minimum requirements for Chat SDK for .NET are:

  • Mono/ .NET 2.0

Note: Sendbird server supports Transport Layer Security (TLS) from version 1.0 up to 1.3. For example, in the server regions where TLS 1.3 isn’t available, lower versions, sequentially from 1.2 to 1.0, will be supported for secure data transmission.


Before you start

Before installing Sendbird Chat SDK, you need to create a Sendbird application on the Sendbird Dashboard, which comprises everything required in a chat service including users, messages, and channels. You will need the App ID of your Sendbird application when initializing the Chat SDK.

Note: Each Sendbird application can be integrated with a single client app. Within the same application, users can communicate with each other across all platforms, whether they are on mobile devices or on the web.

Access control list

Sendbird provides various access control options when using the Chat SDK. By default, the following attributes are turned on to avoid unexpected errors when creating sample apps and sending your first message:

  • Allow retrieving user list
  • Allow updating user metadata
  • Allow creating open channels
  • Allow creating group channels

However, this may grant access to unwanted data or operations, leading to potential security concerns. To manage your access control settings, you can turn on or off each option in Settings > Application > Security > Access control list on Sendbird Dashboard.


Get started

To send a message in a client app, you should build and configure an in-app chat using Sendbird Chat SDK.

Step 1 Create a project

Create a new Visual Studio project.

Step 2 Install the Chat SDK

Installing the Chat SDK is simple if you’re familiar with using external libraries or SDK’s in your projects.

  1. Download SendBird.dll in the GitHub repository for .NET. You must also download websocket-sharp.dll, a WebSocket library, in the same repository. The Chat SDK uses websocket-sharp to connect to Sendbird server.

  2. Open your project in Visual Studio, then import both SendBird.dll and websocket-sharp.dll files into your Reference.

  3. Once the libraries have been imported, add the following code at the top of your source code file to start using Sendbird Chat SDK.

using SendBird;

Step 3 Initialize the Chat SDK

Now, initialize Sendbird Chat SDK in the app to allow the Chat SDK to respond to changes in the connection status of .NET client apps. Initialization requires the App ID, which can be found on Sendbird Dashboard. Pass in the App ID of the Sendbird application you created earlier on the dashboard to SendBirdClient.Init() for the initialization.

// Replace APP_ID with your own Sendbird application ID.
SendBirdClient.Init(APP_ID);

Note: The SendBirdClient.Init() method of a SendBirdClient instance must be called once across your .NET client app.

Step 4 Connect to Sendbird server

You will need a user in order to connect to Sendbird server and send a message to a channel. You can either create a user in the Sendbird Dashboard or use a unique ID that hasn't been taken by any of your Sendbird application users. In the latter case, a new user will be automatically created in your Sendbird application before being connected.

Note: To learn more about authenticating with an access token, go to Authentication.

SendBirdClient.Connect(USER_ID, (User user, SendBirdException e) =>
{
    if(e != null)
    {
        return; // Handle error.
    }

    // The user is connected to the Sendbird server.
});

Step 5 Create a new open channel

Create an open channel using the following codes. Open channels are where all users in your Sendbird application can easily participate without an invitation.

OpenChannel.CreateChannel((OpenChannel openChannel, SendBirdException e) =>
    if(e != null) // Handle error.
    {
        return;
    }
    // An open channel is successfully created.
    // Through the openChannel parameter of the callback method,
    // you can get the open channel's data from the Sendbird server.
});

Note: You can also create a group channel to send a message. To learn more, see Create a channel in the Group channel page.

Step 6 Enter the channel

Enter the open channel to send and receive messages.

// The following sample code continues from Step 5.
OpenChannel.CreateChannel((OpenChannel openChannel, SendBirdException e) =>
    if (e != null) // Handle error.
    {
        return;
    }

    // Call the instance method of the result object in the
    // openChannel parameter of the callback method.

    openChannel.Enter((SendBirdException e) => {
        if (e != null) // Handle error.
        {
            return;
        }
        // The current user successfully enters the open channel,
        // and can chat with other users in the channel by using APIs.
    });
});

Step 7 Send a message to the channel

Finally, send a message to the channel. To learn about the message types you can send, refer to Message overview in Chat Platform API.

You can check the message you've sent in Sendbird Dashboard. To learn about receiving a message, refer to the receive messages through a channel event handler page.

openChannel.SendUserMessage(MESSAGE, (UserMessage userMessage, SendBirdException e) => {
    if (e != null)  // Handle error.
    {
        return;
    }
    // The message is successfully sent to the channel.
    // The current user can receive messages from other users
    // through the ChannelHandler.onMessageReceived() method of an event handler.
});