• Статья

UdpAnySourceMulticastClient.UnblockSource Method

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

Unblocks a source that was previously blocked by a call to the BlockSource method so that multicast packets originating from it can be received.

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

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Sub UnblockSource ( _
    sourceAddress As IPAddress _
)

[SecuritySafeCriticalAttribute]
public void UnblockSource(
    IPAddress sourceAddress
)

Parameters

Exceptions

Exception Condition
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. See the Remarks section for more information.

Remarks

The UnblockSource method unblocks multicast packets originating from a specified source address so they can be received. The specified source address must have previously been blocked by a call to the BlockSource method.

The client must have completed a join to the multicast group.

The sourceAddress parameter may be either an IPv6 or IPv4 multicast address.

If the specified source address in the sourceAddress parameter was not previously blocked by a call to the BlockSource method, a SocketException is thrown with SocketError.AddressNotAvailable.

If there is a socket failure while performing the unblock source operation, 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.