Configuration API for C# SDK
C# complete API reference for building real-time applications on PubNub, including basic usage and sample code.
Request execution
We recommend using try
and catch
statements when working with the C# SDK.
If there's an issue with the provided API parameter values, like missing a required parameter, the SDK throws an exception. However, if there is a server-side API execution issue or a network problem, the error details are contained within the status
.
try
{
PNResult<PNPublishResult> publishResponse = await pubnub.Publish()
.Message("Why do Java developers wear glasses? Because they can't C#.")
.Channel("my_channel")
.ExecuteAsync();
PNStatus status = publishResponse.Status;
Console.WriteLine("Server status code : " + status.StatusCode.ToString());
}
catch (Exception ex)
{
Console.WriteLine($"Request can't be executed due to error: {ex.Message}");
}
Configuration
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# SDK:
PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"));
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 required for access control operations. |
UserId | UserId | Yes | UserId to use. The UserId object takes string as an argument. You should set a unique identifier for the user or the device that connects to PubNub.It's a UTF-8 encoded string of up to 92 alphanumeric characters. If you don't set theUserId , you won't be able to connect to PubNub. |
LogLevel | PubnubLogLevel | No | Enum defining the level of severity captured in logs. Available values:
PubnubLogLevel.None , which means logging is off. For more information, refer to Troubleshooting. |
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 | Custom reconnection configuration parameters. Default is PNReconnectionPolicy.EXPONENTIAL (subscribe only). Available values:
For more information, refer to SDK connection lifecycle. |
ConnectionMaxRetries | int | Optional | The maximum number of reconnection attempts. If not provided, the SDK will not reconnect. For more information, refer to Reconnection Policy. |
PresenceTimeout | int | Optional | Defines how long the server considers the client alive for presence. This property works similarly to the concept of long polling by sending periodic requests to the PubNub server at a given interval (like every 300 seconds). These requests ensure the client remains active on subscribed channels. If no heartbeat is received within the timeout period, the client is marked inactive, triggering a "timeout" event on the presence channel. |
SetPresenceTimeoutWithCustomInterval | int | Optional | Specifies how often the client will send heartbeat signals to the server. This property offers more granular control over client activity tracking than PresenceTimeout . Configure this property to achieve a shorter presence timeout if needed, with the interval typically recommended to be (PresenceTimeout / 2) - 1 . |
Proxy | Proxy | Optional | Instructs the SDK to use a Proxy configuration when communicating with PubNub servers. |
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 of 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 . |
CryptoModule | AesCbcCryptor(CipherKey) LegacyCryptor(CipherKey) | Optional | The cryptography module used for encryption and decryption of messages and files. Takes the CipherKey parameter as argument. For more information, refer to the CryptoModule section. |
EnableEventEngine | Boolean | Optional | True by default. Whether to use the standardized workflows for subscribe and presence. Refer to SDK connection lifecycle for more information. |
RetryConfiguration | RetryConfiguration | Optional | (Applicable when enableEventEngine = true ) Custom reconnection configuration parameters. Available values:
For more information, refer to Reconnection Policy. The C-sharp SDK doesn't support excluding endpoints. |
LogVerbosity | PNLogVerbosity | This parameter is deprecated, use LogLevel instead.PNLogVerbosity.BODY to enable debugging. To disable debugging use the option PNLogVerbosity.NONE | |
PubnubLog | IPubnubLog | This parameter is deprecated, use the SetLogger method to configure a custom logger that implements the IPubnubLogger interface.IPubnubLog to capture logs for troubleshooting. | |
CipherKey | This way of setting this parameter is deprecated, pass it to CryptoModule instead. cipher is passed, all communications to/from PubNub will be encrypted. | ||
UseRandomInitializationVector | This way of setting this parameter is deprecated, pass it to CryptoModule instead. 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 . | ||
Uuid | This parameter is deprecated, use userId instead.UUID to use. You should set a unique UUID to identify the user or the device that connects to PubNub. If you don't set the UUID , you won't be able to connect to PubNub. |
CryptoModule
CryptoModule
provides encrypt/decrypt functionality for messages and files. From the 6.18.0 release on, you can configure how the actual encryption/decryption algorithms work.
Each PubNub SDK is bundled with two ways of encryption: the legacy encryption with 128-bit cipher key entropy and the recommended 256-bit AES-CBC encryption. For more general information on how encryption works, refer to the Message Encryption and File Encryption sections.
If you do not explicitly set the CryptoModule
in your app and have the CipherKey
and UseRandomInitializationVector
params set in PubNub config, the client defaults to using the legacy encryption.
Legacy encryption with 128-bit cipher key entropy
You don't have to change your encryption configuration if you want to keep using the legacy encryption. If you want to use the recommended 256-bit AES-CBC encryption, you must explicitly set that in PubNub config.
CryptoModule
configuration
To configure the CryptoModule
to encrypt all messages/files, you can use the following methods in the C# SDK:
// encrypts using 256-bit AES-CBC cipher (recommended)
// decrypts data encrypted with the legacy and the 256-bit AES-CBC ciphers
pnConfiguration.CryptoModule = new CryptoModule(new AesCbcCryptor("enigma"), new List<ICryptor> { new LegacyCryptor("enigma") })
// encrypts with 128-bit cipher key entropy (legacy)
// decrypts data encrypted with the legacy and the 256-bit AES-CBC ciphers
pnConfiguration.CryptoModule = new CryptoModule(new LegacyCryptor("enigma"), new List<ICryptor> { new AesCbCCryptor("enigma") })
Your client can decrypt content encrypted using either of the modules. This way, you can interact with historical messages or messages sent from older clients while encoding new messages using the more secure 256-bit AES-CBC cipher.
Older SDK versions
Apps built using the SDK versions lower than 6.18.0 will not be able to decrypt data encrypted using the 256-bit AES-CBC cipher. Make sure to update your clients or encrypt data using the legacy algorithm.
Basic Usage
Reference code
This example is a self-contained code snippet ready to be run. It includes necessary imports and executes methods with console logging. Use it as a reference when working with other examples in this document.
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
using System;
using System.Collections.Generic;
using PubnubApi;
class ConfigurationExample
{
static void Main(string[] args)
{
// Create a configuration instance for PubNub
PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"))
{
SubscribeKey = "demo", // Required
PublishKey = "demo", // Only required if publishing
SecretKey = "SecretKey", // Only required for access operations
Secure = true, // Enable SSL
show all 35 linesInitialization
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# SDK:
new Pubnub(pnConfiguration);
Parameter | Description |
---|---|
pnConfiguration *Type: PNConfiguration | Goto Configuration for more details. |
Basic Usage
Initialize the PubNub client API
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
using PubnubApi;
class InitializationExample
{
static void Main(string[] args)
{
// Initialize PubNub using the configuration
PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"))
{
SubscribeKey = "demo",
PublishKey = "demo",
Secure = true
};
// Create the PubNub instance with the configuration
show all 19 linesReturns
It returns the PubNub instance for invoking PubNub APIs like Publish()
, Subscribe()
, History()
, HereNow()
, etc.
Other Examples
Initialize a non-secure client
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"));
pnConfiguration.PublishKey = "my_pubkey";
pnConfiguration.SubscribeKey = "my_subkey";
pnConfiguration.Secure = false;
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:
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"));
pnConfiguration.SubscribeKey = "my_subkey";
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.
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"));
pnConfiguration.PublishKey = "my_pubkey";
pnConfiguration.SubscribeKey = "my_subkey";
pnConfiguration.Secure = true;
Pubnub pubnub = new Pubnub(pnConfiguration);
Requires Access Manager add-on
This method requires that the Access Manager add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
Secure your 'secretKey'
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 Access Manager permissions, the API is initialized with the SecretKey
as in the following example:
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"));
pnConfiguration.PublishKey = "my_pubkey";
pnConfiguration.SubscribeKey = "my_subkey";
pnConfiguration.SecretKey = "my_secretkey";
pnConfiguration.Secure = true;
Pubnub pubnub = new Pubnub(pnConfiguration);
Now that the pubnub object is instantiated the client will be able to access the Access Manager functions. The pubnub object will use the SecretKey
to sign all Access Manager messages to the PubNub Network.
Event Listeners
PubNub SDKs provide several sources for real-time updates:
- The PubNub client can receive updates from all subscriptions: all channels, channel groups, channel metadata, and users.
- The
Subscription
object can receive updates only for the particular object for which it was created: channel, channel group, channel metadata, or user. - The
SubscriptionsSet
object can receive updates for all objects for which a list of subscription objects was created.
To facilitate working with those real-time update sources, PubNub SDKs use local representations of server entities that allow you to subscribe and add handlers on a per-entity basis. For more information, refer to Publish & Subscribe.
UserId
These functions are used to set/get a user ID on the fly.
Property(s)
To set/get UserId
you can use the following property(s) in C# SDK:
config.UserId = new UserId("myUserId");
Property | Description |
---|---|
UserId *Type: string | UserId to be used as a device identifier. If you don't set the UserId , you won't be able to connect to PubNub. |
pubnub.GetCurrentUserId();
This method doesn't take any arguments.
Basic Usage
Set User ID
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
PNConfiguration pnConfiguration = new PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"));
config.UserId = new UserId("myUserId");
Get User ID
var currentUserId = pubnub.GetCurrentUserId();
Authentication Key
Setter and getter for users auth key.
Property(s)
AuthKey
Property | Description |
---|---|
AuthKey *Type: string | 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 = new PNConfiguration(new UserId("myUniqueUserId"));
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-on
This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
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 or get message filters, you can use the following property. To learn more about filtering,refer to the Publish Messages documentation.
Property(s)
FilterExpression
Property | Description |
---|---|
FilterExpression *Type: string | PSV2 feature to Subscribe with a custom filter expression. |
pnConfiguration.FilterExpression;
This method doesn't take any arguments.
Basic Usage
Set Filter Expression
Required UserId
Always set the UserId
to uniquely identify the user or device that connects to PubNub. This UserId
should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UserId
, you won't be able to connect to PubNub.
PNConfiguration pnConfiguration = new PNConfiguration pnConfiguration = new PNConfiguration(new UserId("myUniqueUserId"));
pnConfiguration.FilterExpression = "such=wow";
Get Filter Expression
var sampleFilterExp = pnConfiguration.FilterExpression;