无法在我的C＃应用​​程序中添加静态端口映射 [英] Can't add a static port mapping in my c# application

问题描述

我正在尝试在我的C＃应用​​程序中添加新的静态端口映射。因为我的应用程序是作为服务器运行的，所以我希望它在端口8000上侦听。

I'm trying to add new static port mapping in my c# application. Because my application runs as a server and i want its to listen on the port 8000.

NATUPNPLib.UPnPNATClass upnpnat = new NATUPNPLib.UPnPNATClass();
NATUPNPLib.IStaticPortMappingCollection mappings = upnpnat.StaticPortMappingCollection;
mappings.Add(8000, "TCP", 8000, "192.168.1.100", true, "Local Web Server");

但它不起作用！，以下是例外：

but it doesn't work!, The exception was the following :

对象引用未设置为对象的实例。

Object reference not set to an instance of an object.

有人可以帮我吗？

这就是我在做什么： http://pietschsoft.com/post/2009/02/05/NET-Framework-Communicate-through-NAT- Router-via-UPnP.aspx

推荐答案

您需要将映射设置为新实例：

You need to set mappings to a new instance:

例如：

var mappings = new List<Mapping>();

然后您可以致电：

mappings.Add(8000, "TCP", 8000, "192.168.1.100", true, "Local Web Server");

来自您的编辑：

upnpnat.StaticPortMappingCollection; // this is your problem.  

该集合返回为空。因此，您不能添加到集合中。

The collection is coming back as null. Therefore you cannot add to the collection.

您可能需要做：

NATUPNPLib.IStaticPortMappingCollection mappings = new StaticPortMappingCollection();

摘自Codesleuth的评论：

我相信答案是他的路由器未配置为UPnP网关，或者他没有权限。如果这些情况中的任何一种为true，则StaticPortMappingCollection为null。建议您将其编辑为答案，因为无论如何您都有正确的错误原因。首先检查null是处理错误的唯一方法

I believe the answer is that his router isn't configured as a UPnP gateway, or that he has no permissions. The StaticPortMappingCollection is null if either of those cases are true. I suggest you edit this into your answer as you've got the right reason for the error anyway. Checking for null first is the only way to deal with the error

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