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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. Read the support page on enabling add-on features on your keys.

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
ParameterDescription
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 NameTypeDescription
Result
PNChannelGroupsAddChannelResult
Returns a PNChannelGroupsAddChannelResult object.
Status
PNStatus
Returns a PNStatus object.

PNChannelGroupsAddChannelResult contains the following properties:

Property NameTypeDescription
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. Read the support page on enabling add-on features on your keys.

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
ParameterDescription
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 NameTypeDescription
Result
PNChannelGroupsAllChannelsResult
Returns a PNChannelGroupsAllChannelsResult object.
Status
PNStatus
Returns a PNStatus object.

PNChannelGroupsAllChannelsResult contains the following property:

Property NameTypeDescription
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. Read the support page on enabling add-on features on your keys.

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
ParameterDescription
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 NameTypeDescription
Result
PNChannelGroupsRemoveChannelResult
Returns a PNChannelGroupsRemoveChannelResult object.
Status
PNStatus
Returns a PNStatus object.

PNChannelGroupsRemoveChannelResult contains the following property:

Property NameTypeDescription
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. Read the support page on enabling add-on features on your keys.

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
ParameterDescription
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}
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