Articolo
11/18/2011

UdpAnySourceMulticastClient.BeginReceiveFromGroup Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Begins the operation of receiving a packet from the joined multicast group and invokes the specified callback when a packet has arrived on the group from any sender.

Namespace: System.Net.Sockets
Assembly: System.Net (in System.Net.dll)

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Function BeginReceiveFromGroup ( _
    buffer As Byte(), _
    offset As Integer, _
    count As Integer, _
    callback As AsyncCallback, _
    state As Object _
) As IAsyncResult

[SecuritySafeCriticalAttribute]
public IAsyncResult BeginReceiveFromGroup(
    byte[] buffer,
    int offset,
    int count,
    AsyncCallback callback,
    Object state
)

Parameters

buffer
Type: array<System.Byte[]
The buffer to store the received data.

offset
Type: System.Int32
The offset, in bytes, from the beginning of the buffer where the data should be stored.

count
Type: System.Int32
The maximum number of bytes to receive and store in the buffer.

callback
Type: System.AsyncCallback
The callback method to invoke when the operation completes.

state
Type: System.Object
Optional state information to pass to the callback method for this operation.

Return Value

Type: System.IAsyncResult
An IAsyncResult that references this operation.

Exceptions

Exception	Condition
ArgumentNullException	buffer is nulla null reference (Nothing in Visual Basic).
ArgumentOutOfRangeException	offset is less than 0 -or- offset is greater than the length of the buffer. -or- count is less than 0 -or- offset plus the count is greater than the length of the buffer.
InvalidOperationException	The multicast group has not yet been joined.
ObjectDisposedException	The UdpAnySourceMulticastClient has been disposed.
SocketException	An error occurred when attempting to access the socket for sending. See the Remarks section for more information.

Remarks

The BeginReceiveFromGroup method begins an operation of receiving a UDP packet from the joined multicast group from any sender. The local port and multicast group address are specified in the UdpAnySourceMulticastClient constructor. The multicast client must also have completed a join to the multicast group.

The method specified in the callback parameter is invoked when a packet has received.

It is possible to have a socket failure if a receive operation fails synchronously, although this is uncommon with UDP. If a socket failure occurs, a SocketException is thrown. The error received is specified as a member of the System.Net.Sockets.SocketError enumeration.

Version Information

Silverlight

Supported in: 5, 4

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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