Missing method exception in .net core

Question

I think this may have something to do with the dependencies, but I'm not really sure.

So I'm trying to check to see if a TCP connection is still active using the extension method I found here, but I'm getting a missing method exception:

"Method not found: 'System.Net.IPEndPoint System.Net.NetworkInformation.TcpConnectionInformation.get_LocalEndPoint()'"

Which I'm a little confused on since the method seems to exist.

Here's the code:

 public static TcpState GetState(this TcpClient tcpClient)
        {

                var status = IPGlobalProperties.GetIPGlobalProperties()
                                               .GetActiveTcpConnections()
                                               .SingleOrDefault(x => x.LocalEndPoint.Equals(tcpClient.Client.LocalEndPoint));

                return status != null ? status.State : TcpState.Unknown;

        }

and the JSON file where I think there might be a problem in how NetworkInformation is referenced:

{
  "buildOptions": {
    "debugType": "portable",
    "emitEntryPoint": true
  },
  "frameworks": {
    "netcoreapp1.0": {
      "dependencies": {
        "Microsoft.NETCore.App": {
          "type": "platform",
          "version": "1.0.0"
        }
      },
      "imports": "dnxcore50"
    }
  },
  "dependencies": {
    "system.net.networkinformation": "4.0.10-beta-23123"

  },
  "version": "1.0.0-*"
}

Am I on the right track? How would I fix it?

Did you double check that your version is the same as the one that supports that code? — Missy, Aug 30 '16 at 14:53
I know it's not the same version, but the [documentation](https://msdn.microsoft.com/en-us/library/system.net.networkinformation.tcpconnectioninformation.localendpoint(v=vs.110).aspx) seems to be consistent. — hereswilson, Aug 30 '16 at 14:59
4.0.10-beta-23123, ugh, those version numbers make anybody's eyes bleed. Looks like you just kept digging for a reference assembly until the compiler was happy. That the runtime isn't happy is not a great mystery. The documentation makes no bones about it either, only available on the full desktop version of the .NET Framework. — Hans Passant, Aug 30 '16 at 15:10
@HansPassant ok so I was on the right track. I was getting an error that TcpState could not be found and adding that dependency seemed to fix it. So I need to get the full version? what version am I using? — hereswilson, Aug 30 '16 at 15:32
try adding `system.net.security` package also, as `networkinformation` depends on `security` package. It might not be loaded dependencies automatically. — Venkata Dorisala, Aug 30 '16 at 16:07
@Venky yeah I guess that fixed it. I also got rid of the beta version. — hereswilson, Aug 31 '16 at 13:01

score 1 · Accepted Answer · answered Aug 31 '16 at 13:11

1

Try adding system.net.security package also, as system.net.networkinformation depends on security package. It might not have loaded dependencies automatically.

answered Aug 31 '16 at 13:11

Venkata Dorisala

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Missing method exception in .net core

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