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Begins an asynchronous operation to add a contact.
Namespace: Microsoft.Rtc.Collaboration.ContactsGroups
Assembly: Microsoft.Rtc.Collaboration (in Microsoft.Rtc.Collaboration.dll)
Syntax
'Declaration
Public Function BeginAddContact ( _
contactUri As String, _
userCallback As AsyncCallback, _
state As Object _
) As IAsyncResult
'Usage
Dim instance As ContactGroupServices
Dim contactUri As String
Dim userCallback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult
returnValue = instance.BeginAddContact(contactUri, _
userCallback, state)
public IAsyncResult BeginAddContact(
string contactUri,
AsyncCallback userCallback,
Object state
)
Parameters
- contactUri
Type: System.String
URI of the contact being added.
- userCallback
Type: System.AsyncCallback
The method to be called when the asynchronous operation is completed.
- state
Type: System.Object
A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.
Return Value
Type: System.IAsyncResult
An IAsyncResult that references the asynchronous operation.
Exceptions
| Exception | Condition |
|---|---|
| InvalidOperationException | Thrown when the subscription state is not idle or subscribed. |
| ArgumentException | Thrown when contactUri is an invalid sip URI. |