Channel Groups API for C# SDK

Channel groups allow PubNub developers to bundle thousands of channels into a group that can be identified by a name. These channel groups can then be subscribed to, receiving data from the many back-end channels the channel group contains.

Channel group operations

You can't publish to a channel group. You can only subscribe to it. To publish within the channel group, you need to publish to each channel individually.

Request execution

Use try/catch when working with the C# SDK.

If a request has invalid parameters (for example, a missing required field), the SDK throws an exception. If the request reaches the server but fails (server error or network issue), the error details are available in the returned status.

1try
2{
3    PNResult<PNPublishResult> publishResponse = await pubnub.Publish()
4        .Message("Why do Java developers wear glasses? Because they can't C#.")
5        .Channel("my_channel")
6        .ExecuteAsync();
7

8    PNStatus status = publishResponse.Status;
9

10    Console.WriteLine("Server status code : " + status.StatusCode.ToString());
11}
12catch (Exception ex)
13{
14    Console.WriteLine($"Request can't be executed due to error: {ex.Message}");
15}

Add channels to a channel group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the PubNub Admin Portal. See Enable the features your app calls.

This function adds channels to a channel group.

Method(s)

Use the following method in the C# SDK:

Maximum number of channels

You can add up to 200 channels to a channel group per API call.

1pubnub.AddChannelsToChannelGroup()
2        .ChannelGroup(string)
3        .Channels(Array)
4        .QueryParam(Dictionary<string,object>)

* required

Parameter	Description
ChannelGroup * Type: string	The channel group to add the channels to.
Channels * Type: Array	The channels to add to the channel group.
QueryParam Type: Dictionary<string, object>	Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async Type: PNCallback	PNCallback of type PNChannelGroupsAddChannelResult. This parameter is deprecated and will be removed in a future version. Please use the ExecuteAsync parameter instead.
Execute * Type: PNCallback	PNCallback of type PNChannelGroupsAddChannelResult.
ExecuteAsync Type: None	Returns PNResult<PNChannelGroupsAddChannelResult>.

Sample code

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.

Add channels

1

Returns

The AddChannelsToChannelGroup() operation returns a PNResult<PNChannelGroupsAddChannelResult> which contains the following properties:

Property Name	Type	Description
Result	PNChannelGroupsAddChannelResult	Returns a PNChannelGroupsAddChannelResult object.
Status	PNStatus	Returns a PNStatus object.

PNChannelGroupsAddChannelResult contains the following properties:

Property Name	Type	Description
PNChannelGroupsAddChannelResult	Object	Returns empty object.
PNStatus	Object	Returns status of request if error occurred or not.

List channels in a channel group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. See Enable the features your app calls.

This function lists all channels in a channel group.

Method(s)

Use the following method in the C# SDK:

1pubnub.ListChannelsForChannelGroup()
2        .ChannelGroup(string)
3        .QueryParam(Dictionary<string,object>)

* required

Parameter	Description
ChannelGroup * Type: string	The channel group for which to list channels.
QueryParam Type: Dictionary<string, object>	Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async Type: PNCallback	PNCallback of type PNChannelGroupsAllChannelsResult. This parameter is deprecated and will be removed in a future version. Please use the ExecuteAsync parameter instead.
Execute * Type: PNCallback	PNCallback of type PNChannelGroupsAllChannelsResult.
ExecuteAsync Type: None	Returns PNResult<PNChannelGroupsAllChannelsResult>.

Sample code

List channels

1

Returns

The ListChannelsForChannelGroup() operation returns a PNChannelGroupsAllChannelsResult which contains the following properties:

Property Name	Type	Description
Result	PNChannelGroupsAllChannelsResult	Returns a PNChannelGroupsAllChannelsResult object.
Status	PNStatus	Returns a PNStatus object.

PNChannelGroupsAllChannelsResult contains the following property:

Property Name	Type	Description
Channels	List<string>	List of channels of a channel group.

Remove channels from a channel group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. See Enable the features your app calls.

This function removes channels from a channel group.

Method(s)

Use the following method in the C# SDK:

1pubnub.RemoveChannelsFromChannelGroup()
2        .ChannelGroup(string)
3        .Channels(Array)
4        .QueryParam(Dictionary<string,object>)

* required

Parameter	Description
ChannelGroup * Type: string	The channel group from which to remove the channels.
Channels * Type: Array	The channels to remove from the channel group.
QueryParam Type: Dictionary<string, object>	Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async Type: PNCallback	PNCallback of type PNChannelGroupsRemoveChannelResult. This parameter is deprecated and will be removed in a future version. Please use the ExecuteAsync parameter instead.
Execute * Type: PNCallback	PNCallback of type PNChannelGroupsRemoveChannelResult.
ExecuteAsync Type: None	Returns PNResult<PNChannelGroupsRemoveChannelResult>.

Sample code

Remove channels

1

Returns

The RemoveChannelsFromChannelGroup() operation returns a PNChannelGroupsAddChannelResult which contains the following properties:

Property Name	Type	Description
Result	PNChannelGroupsRemoveChannelResult	Returns a PNChannelGroupsRemoveChannelResult object.
Status	PNStatus	Returns a PNStatus object.

PNChannelGroupsRemoveChannelResult contains the following property:

Property Name	Type	Description
PNChannelGroupsRemoveChannelResult	Object	Returns empty object.

Delete a channel group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. See Enable the features your app calls.

This function deletes a channel group.

Method(s)

Use the following method in the C# SDK:

1pubnub.DeleteChannelGroup()
2        .ChannelGroup(string)
3        .QueryParam(Dictionary<string,object>)

* required

Parameter	Description
ChannelGroup * Type: string	The channel group to delete.
QueryParam Type: Dictionary<string, object>	Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async Type: PNCallback	PNCallback of type PNChannelGroupsDeleteGroupResult. This parameter is deprecated and will be removed in a future version. Please use the ExecuteAsync parameter instead.
Execute * Type: PNCallback	PNCallback of type PNChannelGroupsDeleteGroupResult.
ExecuteAsync Type: None	Returns PNResult<PNChannelGroupsAllChannelsResult>.

Sample code

Delete channel group

1

Response

1{
2    "status" : 200,
3    "message" : "OK",
4    "service" : "channel-registry",
5    "error" : False
6}