如何加入在C＃源特定组播组（IGMPv3的） [英] How to join source specific multicast group in C# (IGMPv3)

问题描述

我们有一个C＃应用程序，可以加入和多播组接收数据。这种运作良好。现在，我们想支持的IGMPv3，并能够加入组播组时指定源的IP地址。从MSDN文档，我不知道如何做到这一点。我发现下面的链接，似乎回答我的问题。

We have a C# application that can join and receives data from a multicast group. This works well. We now want to support IGMPv3 and be able to specify the IP of the source when joining a multicast group. From the MSDN documentation, I don't see how to do this. I have found the following link that seems to answer my question.

的 http://social.msdn.microsoft.com/Forums/en/netfxnetcom/thread/e8063f6d-22f5-445e-a00c-bf46b46c1561

这里是我是如何实现这一点：

And here is how I implemented this:

byte[] membershipAddresses = new byte[12]; // 3 IPs * 4 bytes (IPv4)
Buffer.BlockCopy(multicastIp.GetAddressBytes(), 0, membershipAddresses, 0, 4);
Buffer.BlockCopy(sourceIp.GetAddressBytes(), 0, membershipAddresses, 4, 4);
Buffer.BlockCopy(localIp.GetAddressBytes(), 0, membershipAddresses, 8, 4);
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, membershipAddresses);

不过，调用此错误SetSocketOption（）时，我接收到一个SocketException：的请求的地址不在其上下文中有效。

有人能指出我什么，我做错了什么？谢谢！

Can someone points me what I am doing wrong here? Thanks!

推荐答案

链接状态 SocketOptionName.AddSourceMembership ，你正在使用 AddMembership 。

The link states SocketOptionName.AddSourceMembership, you are using AddMembership.

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