C# V4 Configuration API Reference for Realtime Apps

C# V4 complete API reference for building Realtime Applications on PubNub, including basic usage and sample code.

Configuration

Description

PNConfiguration instance is storage for user-provided information which describe further PubNub client behavior. Configuration instance contain additional set of properties which allow to perform precise PubNub client configuration.

Method(s)

To create configuration instance you can use the following function in the C# V4 SDK:

new PNConfiguration();

Properties	Type	Required	Description
`SubscribeKey`	string	Yes	`SubscribeKey` from Admin Portal.
`PublishKey`	string	Optional	`PublishKey` from Admin Portal (only required if publishing).
`SecretKey`	string	Optional	`SecretKey` (only required for access operations, keep away from Android).
`CipherKey`	string	Optional	If `cipher` is passed, all communications to/from PubNub will be encrypted.
`Uuid`	string	Optional	`UUID` to use. You should set a unique `UUID` to identify the user or the device that connects to PubNub. Allowing the SDK to generate a random `UUID` can result in significant billing impacts, particularly on an MAU pricing plan.
`LogVerbosity`	PNLogVerbosity	Yes	Set `PNLogVerbosity.BODY` to enable debugging. To disable debugging use the option `PNLogVerbosity.NONE`
`AuthKey`	string	Optional	If Access Manager is utilized, client will use this `AuthKey` in all restricted requests.
`Secure`	bool	Optional	Use `SSL`.
`SubscribeTimeout`	int	Optional	How long to keep the `subscribe` loop running before disconnect.The value is in seconds.
`NonSubscribeRequestTimeout`	int	Optional	On `non subscribe` operations, how long to wait for server response.The value is in seconds.
`FilterExpression`	string	Optional	Feature to subscribe with a custom filter expression.
`HeartbeatNotificationOption`	PNHeartbeatNotificationOption	Optional	`Heartbeat` notifications, by default, the SDK will alert on failed heartbeats (equivalent to: `PNHeartbeatNotificationOption.FAILURES`). Other options such as all heartbeats (`PNHeartbeatNotificationOption.ALL`) or no heartbeats (`PNHeartbeatNotificationOption.NONE`) are supported.
`Origin`	string	Optional	Custom `Origin` if needed.
`ReconnectionPolicy`	PNReconnectionPolicy	Optional	Set to `PNReconnectionPolicy.LINEAR` for automatic reconnects. Use option `PNReconnectionPolicy.NONE` to disable automatic reconnects. Use option `PNReconnectionPolicy.EXPONENTIAL` to set exponential retry interval.
`PresenceTimeout`	int	Optional	The setting with set the custom presence server timeout.The value is in seconds.
`PresenceInterval`	int	Optional	The setting with set the custom presence server timeout along with the custom interval to send the ping back to the server.The value is in seconds.
`Proxy`	Proxy	Optional	Instruct the SDK to use a `Proxy` configuration when communicating with PubNub servers.
`PubnubLog`	IPubnubLog	Optional	Pass the instance of a class that implements `IPubnubLog` to capture logs for troubleshooting.
`UseClassicHttpWebRequest`	bool	Optional	Use `HttpWebRequest` to support ASP.NET/MVC and other IIS hosting applications.
`EnableTelemetry`	bool	Optional	Enables the SDK to capture analytics in terms of response time and sends them to PubNub server. It is enabled by default.
`RequestMessageCountThreshold`	Number	Optional	`PNRequestMessageCountExceededCategory` is thrown when the number of messages into the payload is above of `requestMessageCountThreshold`.
`SuppressLeaveEvents`	bool	Optional	When `true` the SDK doesn't send out the leave requests.
`DedupOnSubscribe`	bool	Optional	When `true` duplicates subscribe messages will be filtered out when devices cross regions.
`MaximumMessagesCacheSize`	int	Optional	It is used with `DedupOnSubscribe` to cache message size.Default is `100`.
`FileMessagePublishRetryLimit`	int	Optional	The number of tries made in case of Publish File Message failure.Default is `5`.
`UseRandomInitializationVector`	bool	Optional	When `true` the IV will be random for all requests and not just file upload. When `false` the IV will be hardcoded for all requests except File Upload.Default `false`.

Basic Usage

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

PNConfiguration pnConfiguration = new PNConfiguration();
// subscribeKey from Admin Portal
pnConfiguration.SubscribeKey = "SubscribeKey"; // required
// publishKey from Admin Portal (only required if publishing)
pnConfiguration.PublishKey = "PublishKey";
// secretKey (only required for access operations)
pnConfiguration.SecretKey = "SecretKey";
// if cipherKey is passed, all communicatons to/from pubnub will be encrypted
pnConfiguration.CipherKey = "cipherKey";
// Uuid to be used as a device identifier, a default Uuid is generated
// if not passed
pnConfiguration.Uuid = "customUUID";
// Enable Debugging
pnConfigurationr.LogVebosity = PNLogVerbosity.BODY;
// if Access Manager is utilized, client will use this AuthKey in all restricted
// requests
pnConfiguration.AuthKey = "authKey";
// use SSL.
pnConfiguration.Secure = true;
// how long to keep the subscribe loop running before disconnect
pnConfiguration.SubscribeTimeout = 310;
// on non subscribe operations, how long to wait for server response
pnConfiguration.NonSubscribeRequestTimeout = 300;
// PSV2 feature to subscribe with a custom filter expression
pnConfiguration.FilterExpression = "such=wow";
// heartbeat notifications, by default, the SDK will alert on failed heartbeats.
// other options such as all heartbeats or no heartbeats are supported.
pnConfiguration.HeartbeatNotificationOption = PNHeartbeatNotificationOption.All;
pnConfiguration.SetPresenceTimeoutWithCustomInterval(120, 59);
pnConfiguration.PresenceTimeout = 120;
// Use HttpWebRequest to support ASP.NET/MVC and other IIS hosting applications
pnConfiguration.UseClassicHttpWebRequest= true;

Initialization

Include the code

using PubnubApi;

Description

This function is used for initializing the PubNub Client API context. This function must be called before attempting to utilize any API functionality in order to establish account level credentials such as PublishKey and SubscribeKey.

Method(s)

To Initialize PubNub you can use the following method(s) in the C# V4 SDK:

```
new Pubnub(pnConfiguration);
```
Parameter Type Required Description

pnConfiguration PNConfiguration Yes Goto Configuration for more details.

Parameter	Type	Required	Description
`pnConfiguration`	PNConfiguration	Yes	Goto Configuration for more details.

Basic Usage

Initialize the PubNub client API:

Note

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.PublishKey = "my_pubkey";
pnConfiguration.SubscribeKey = "my_subkey";
pnConfiguration.Secure = true;
pnConfiguration.Uuid = "myUniqueUUID";
Pubnub pubnub = new Pubnub(pnConfiguration);

Returns

It returns the PubNub instance for invoking PubNub APIs like Publish(), Subscribe(), History(), HereNow(), etc.

Other Examples

Initialize a non-secure client:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.PublishKey = "my_pubkey";
pnConfiguration.SubscribeKey = "my_subkey";
pnConfiguration.Secure = false;
pnConfiguration.Uuid = "myUniqueUUID";
Pubnub pubnub = new Pubnub(pnConfiguration);
```
Initialization for a Read-Only client:

In the case where a client will only read messages and never publish to a channel, you can simply omit the PublishKey when initializing the client:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.SubscribeKey = "my_subkey";
Pubnub pubnub = new Pubnub(pnConfiguration);
```
Use a custom UUID

Set a custom UUID to identify your users.

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.PublishKey = "myPublishKey";
pnConfiguration.SubscribeKey = "mySubscribeKey";
pnConfiguration.Uuid = "myUniqueUUID";

Pubnub pubnub = new Pubnub(pnConfiguration);
```
Initializing with SSL Enabled:

This examples demonstrates how to enable PubNub Transport Layer Encryption with SSL. Just initialize the client with Secure set to true. The hard work is done, now the PubNub API takes care of the rest. Just subscribe and publish as usual and you are good to go.

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.PublishKey = "my_pubkey";
pnConfiguration.SubscribeKey = "my_subkey";
pnConfiguration.Secure = true;
pnConfiguration.Uuid = "myUniqueUUID";
Pubnub pubnub = new Pubnub(pnConfiguration);
```
Initializing with Access Manager: Requires Access Manager add-onRequires that the Access Manager add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Note

Anyone with the SecretKey can grant and revoke permissions to your app. Never let your SecretKey be discovered, and to only exchange it / deliver it securely. Only use the SecretKey on secure server-side platforms.

When you init with SecretKey, you get root permissions for the Access Manager. With this feature you don't have to grant access to your servers to access channel data. The servers get all access on all channels.

For applications that will administer PAM permissions, the API is initialized with the SecretKey as in the following example:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.PublishKey = "my_pubkey";
pnConfiguration.SubscribeKey = "my_subkey";
pnConfiguration.SecretKey = "my_secretkey";
pnConfiguration.Uuid = "myUniqueUUID";
pnConfiguration.Secure = true;

Pubnub pubnub = new Pubnub(pnConfiguration);
```
Now that the pubnub object is instantiated the client will be able to access the PAM functions. The pubnub object will use the SecretKey to sign all PAM messages to the PubNub Network.

Event Listeners

Description

You can be notified of connectivity status, message and presence notifications via the listeners.

Listeners should be added before calling the method.

Method 1 to add listener

// Adding listener.
pubnub.AddListener(new SubscribeCallbackExt(
    delegate (Pubnub pnObj, PNMessageResult<object> pubMsg)
    {
        Console.WriteLine(pubnub.JsonPluggableLibrary.SerializeToJsonString(pubMsg));
        var channelName = pubMsg.Channel;
        var channelGroupName = pubMsg.Subscription;
        var pubTT = pubMsg.Timetoken;
        var msg = pubMsg.Message;
        var publisher = pubMsg.Publisher;
    },
    delegate (Pubnub pnObj, PNPresenceEventResult presenceEvnt)
    {
        Console.WriteLine(pubnub.JsonPluggableLibrary.SerializeToJsonString(presenceEvnt));
        var action = presenceEvnt.Event; // Can be join, leave, state-change or timeout
        var channelName = presenceEvnt.Channel; // The channel for which the message belongs
        var occupancy = presenceEvnt.Occupancy; // No. of users connected with the channel
        var state = presenceEvnt.State; // User State
        var channelGroupName = presenceEvnt.Subscription; //  The channel group or wildcard subscription match (if exists)
        var publishTime = presenceEvnt.Timestamp; // Publish timetoken
        var timetoken = presenceEvnt.Timetoken;  // Current timetoken
        var uuid = presenceEvnt.Uuid; // UUIDs of users who are connected with the channel
    },
    delegate (Pubnub pnObj, PNSignalResult<object> signalMsg)
    {
        Console.WriteLine(pubnub.JsonPluggableLibrary.SerializeToJsonString(signalMsg));
        var channelName = signalMsg.Channel; // The channel for which the signal belongs
        var channelGroupName = signalMsg.Subscription; // The channel group or wildcard subscription match (if exists)
        var pubTT = signalMsg.Timetoken; // Publish timetoken
        var msg = signalMsg.Message; // The Payload
        var publisher = signalMsg.Publisher; //The Publisher
    },
    delegate (Pubnub pnObj, PNObjectEventResult objectEventObj)
    {
        var channelName = objectEventObj.Channel; // Channel
        var channelMetadata = objectEventObj.ChannelMetadata; //Channel Metadata
        var uidMetadata = objectEventObj.UuidMetadata; // UUID metadata
        var evnt = objectEventObj.Event; // Event
        var type = objectEventObj.Type; // Event type
        if (objectEventObj.Type == "uuid") {
                /* got uuid metadata related event. */
            }
        else if (objectEventObj.Type == "channel") {
                /* got channel metadata related event. */
            }
        else if (objectEventObj.Type == "membership") {
                /* got membership related event. */
            }
        Console.WriteLine(pubnub.JsonPluggableLibrary.SerializeToJsonString(objectEventObj));
    },
    delegate (Pubnub pnObj, PNMessageActionEventResult msgActionEvent)
    {
        //handle message action
        var channelName = msgActionEvent.Channel; // The channel for which the message belongs
        var msgEvent = msgActionEvent.Action; // message action added or removed
        var msgActionType = msgActionEvent.Event; // message action type
        var messageTimetoken = msgActionEvent.MessageTimetoken; // The timetoken of the original message
        var actionTimetoken = msgActionEvent.ActionTimetoken; //The timetoken of the message action
    },
    delegate (Pubnub pnObj, PNFileEventResult fileEvent)
    {
        //handle file message event
        var channelName = fileEvent.Channel;
        var chanelGroupName = fileEvent.Subscription;
        var fieldId = (fileEvent.File != null) ? fileEvent.File.Id : null;
        var fileName = (fileEvent.File != null) ? fileEvent.File.Name : null;
        var fileUrl = (fileEvent.File != null) ? fileEvent.File.Url : null;
        var fileMessage = fileEvent.Message;
        var filePublisher = fileEvent.Publisher;
        var filePubTT = fileEvent.Timetoken;
    },
    delegate (Pubnub pnObj, PNStatus pnStatus)
    {
        Console.WriteLine("{0} {1} {2}", pnStatus.Operation, pnStatus.Category, pnStatus.StatusCode);
        var affectedChannelGroups = pnStatus.AffectedChannelGroups; // The channel groups affected in the operation, of type array.
        var affectedChannels = pnStatus.AffectedChannels; // The channels affected in the operation, of type array.
        var category = pnStatus.Category; //Returns PNConnectedCategory
        var operation = pnStatus.Operation; //Returns PNSubscribeOperation
    }
));

//Add listener to receive Signal messages
SubscribeCallbackExt signalSubscribeCallback = new SubscribeCallbackExt(
    delegate (Pubnub pubnubObj, PNSignalResult<object> message) {
        // Handle new signal message stored in message.Message
    },
    delegate (Pubnub pubnubObj, PNStatus status)
    {
        // the status object returned is always related to subscribe but could contain
        // information about subscribe, heartbeat, or errors
    }
);
pubnub.AddListener(signalSubscribeCallback);

SubscribeCallbackExt eventListener = new SubscribeCallbackExt(
    delegate (Pubnub pnObj, PNObjectEventResult objectEvent)
    {
        string channelMetadataId = objectEvent.Channel; // The channel
        string uuidMetadataId = objectEvent.Uuid; // The UUID
        string objEvent = objectEvent.Event; // The event name that occurred
        string eventType = objectEvent.Type; // The event type that occurred
        PNUuidMetadataResult uuidMetadata = objectEvent.UuidMetadata; // UuidMetadata
        PNChannelMetadataResult channelMetadata = objectEvent.ChannelMetadata; // ChannelMetadata
    },
    delegate (Pubnub pnObj, PNStatus status)
    {

    }
);
pubnub.AddListener(eventListener);

Method 2 to add listener

public class DevSubscribeCallback : SubscribeCallback
    {
        public override void Message<T>(Pubnub pubnub, PNMessageResult<T> message)
        {
            // Handle new message stored in message.Message
        }

        public override void Presence(Pubnub pubnub, PNPresenceEventResult presence)
        {
            // handle incoming presence data
        }

        public override void Signal<T>(Pubnub pubnub, PNSignalResult<T> signal)
        {
            // Handle new signal message stored in signal.Message
        }

        public override void Status(Pubnub pubnub, PNStatus status)
        {
            // the status object returned is always related to subscribe but could contain
            // information about subscribe, heartbeat, or errors
            // use the PNOperationType to switch on different options
            switch (status.Operation)
            {
                // let's combine unsubscribe and subscribe handling for ease of use
            case PNOperationType.PNSubscribeOperation:
            case PNOperationType.PNUnsubscribeOperation:
                // note: subscribe statuses never have traditional
                // errors, they just have categories to represent the
                // different issues or successes that occur as part of subscribe
                switch (status.Category)
                {
                    case PNStatusCategory.PNConnectedCategory:
                        // this is expected for a subscribe, this means there is no error or issue whatsoever
                        break;
                    case PNStatusCategory.PNReconnectedCategory:
                        // this usually occurs if subscribe temporarily fails but reconnects. This means
                        // there was an error but there is no longer any issue
                        break;
                    case PNStatusCategory.PNDisconnectedCategory:
                        // this is the expected category for an unsubscribe. This means there
                        // was no error in unsubscribing from everything
                        break;
                    case PNStatusCategory.PNUnexpectedDisconnectCategory:
                        // this is usually an issue with the internet connection, this is an error, handle appropriately
                        break;
                    case PNStatusCategory.PNAccessDeniedCategory:
                        // this means that PAM does allow this client to subscribe to this
                        // channel and channel group configuration. This is another explicit error
                        break;
                    default:
                        // More errors can be directly specified by creating explicit cases for other
                        // error categories of `PNStatusCategory` such as `PNTimeoutCategory` or `PNMalformedFilterExpressionCategory` or `PNDecryptionErrorCategory`
                        break;
                }
                break;
            case PNOperationType.PNHeartbeatOperation:
                // heartbeat operations can in fact have errors, so it is important to check first for an error.
                if (status.Error)
                {
                    // There was an error with the heartbeat operation, handle here
                }
                else
                {
                    // heartbeat operation was successful
                }
                break;
            default:
                // Encountered unknown status type
                break;
            }
        }

        public override void ObjectEvent(Pubnub pubnub, PNObjectEventResult objectEvent)
        {
            // handle incoming user, space and membership event data
        }

        public override void MessageAction(Pubnub pubnub, PNMessageActionEventResult messageAction)
        {
            // handle incoming message action events
        }
    }

// Usage of the above listener
DevSubscribeCallback regularListener = new DevSubscribeCallback();
pubnub.AddListener(regularListener);

Removing Listeners

SubscribeCallbackExt listenerSubscribeCallack = new SubscribeCallbackExt(
    (pubnubObj, message) => { },
    (pubnubObj, presence) => { },
    (pubnubObj, status) => { });

pubnub.AddListener(listenerSubscribeCallack);

// some time later
pubnub.RemoveListener(listenerSubscribeCallack);

Listener status events

Category	Description
`PNNetworkIssuesCategory`	The SDK is not able to reach the PubNub Data Stream Network because the machine or device are not connected to Internet or this has been lost, your ISP (Internet Service Provider) is having to troubles or perhaps or the SDK is behind of a proxy.
`PNUnknownCategory`	PubNub SDK could return this Category if the captured `error` is insignificant client side `error` or not known type at the time of SDK development.
`PNBadRequestCategory`	PubNub C# SDK will send `PNBadRequestCategory` when some parameter is missing like `subscribe key`, `publish key`.
`PNTimeoutCategory`	Processing has failed because of request time out.
`PNReconnectedCategory`	SDK was able to reconnect to pubnub.
`PNConnectedCategory`	SDK subscribed with a new mix of channels (fired every time the `channel` / `channel group` mix changed).

UUID

Description

These functions are used to set/get a user ID on the fly.

Property(s)

To set/get UUID you can use the following property(s) in C# V4 SDK:

Uuid

Property	Type	Required	Description
`Uuid`	string	Yes	`Uuid` to be used as a device identifier, a default `Uuid` is generated if not passed.

pnConfiguration.Uuid;

This method doesn't take any arguments.

Basic Usage

Set UUID:

Note

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.Uuid = "myUniqueUUID";

Get UUID:

var customUUID = pnConfiguration.Uuid;

Authentication Key

Description

Setter and getter for users auth key.

Property(s)

AuthKey

Property	Type	Required	Description
`AuthKey`	string	Yes	If Access Manager is utilized, client will use this `AuthKey` in all restricted requests.

pnConfiguration.AuthKey;

This method doesn't take any arguments.

Basic Usage

Set Auth Key

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.AuthKey = "authKey";

Get Auth Key

var sampleAuthKey = pnConfiguration.AuthKey;

Returns

Get Auth key returns the current authentication key.

Filter Expression

Requires Stream Controller add-onRequires that the Stream Controller add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Description

Stream filtering allows a subscriber to apply a filter to only receive messages that satisfy the conditions of the filter. The message filter is set by the subscribing client(s) but it is applied on the server side thus preventing unwanted messages (those that do not meet the conditions of the filter) from reaching the subscriber.

To set/get filters you can use the following property. To learn more about filtering,refer to the Publish Messages documentation.

Property(s)

FilterExpression

Property	Type	Required	Description
`FilterExpression`	string	Yes	PSV2 feature to `Subscribe` with a custom filter expression.

pnConfiguration.FilterExpression;

This method doesn't take any arguments.

Basic Usage

Set Filter Expression

Note

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.FilterExpression = "such=wow";

Get Filter Expression

var sampleFilterExp = pnConfiguration.FilterExpression;