ChatRoomSession.BeginQueryChatHistory Method (ChatHistoryQueryOptions, AsyncCallback, Object)
Query the history of chat on this chat room.
Namespace: Microsoft.Rtc.Collaboration.GroupChat
Assembly: Microsoft.Rtc.Collaboration.GroupChat (in Microsoft.Rtc.Collaboration.GroupChat.dll)
Syntax
'Declaration
Public Function BeginQueryChatHistory ( _
query As ChatHistoryQueryOptions, _
userCallback As AsyncCallback, _
state As Object _
) As IAsyncResult
'Usage
Dim instance As ChatRoomSession
Dim query As ChatHistoryQueryOptions
Dim userCallback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult
returnValue = instance.BeginQueryChatHistory(query, _
userCallback, state)
public IAsyncResult BeginQueryChatHistory(
ChatHistoryQueryOptions query,
AsyncCallback userCallback,
Object state
)
Parameters
- query
Type: Microsoft.Rtc.Collaboration.GroupChat.ChatHistoryQueryOptions
The query.
- userCallback
Type: System.AsyncCallback
The method to be invoked when this asynchronous operation completes.
- state
Type: System.Object
An object to be passed back to the callback.
Return Value
Type: System.IAsyncResult
An IAsyncResult that references this operation.
Exceptions
Exception | Condition |
---|---|
ArgumentException | Thrown when invalid arguments are passed. |
[Microsoft.Rtc.Collaboration.GroupChat.ChatServerConnectionException] | Thrown when the GroupChatEndpoint is not established. |
[Microsoft.Rtc.Collaboration.GroupChat.ChatRoomSessionStateException] | Thrown when the ChatRoomSession is not joined. |
[System.InvalidOperationException] | Thrown when the chat server connection is not in a valid state to send the command. |
[RealTimeException] | Thrown when the GroupChatEndpoint encounters an error communicating with the group chat server. |
Remarks
This request will be processed asynchronously. See EndQueryChatHistory(IAsyncResult) to complete this asynchronous operation.