C#: MAC addres reading

Question

Following script to read MAC address in C# and working fine for .Net Framework 4

macAddr =
    (
        from nic in NetworkInterface.GetAllNetworkInterfaces()
        where nic.OperationalStatus == OperationalStatus.Up
        select nic.GetPhysicalAddress().ToString()

    ).FirstOrDefault();

But the problem is I need to build it for .Net Framework 3

When I use .Net Framework 3 then following error occurs

Could not find an implementation of the query pattern for source type 'System.Net.NetworkInformation.NetworkInterface[]'. 'Where' not found. Are you missing a reference or a using directive for 'System.Linq'?
(are you missing an assembly reference?)

What will be the solution. Thanks in advance

`Are you missing a reference or a using directive for 'System.Linq'?` — Rob, Mar 21 '16 at 05:05
I tried to add reference System.Linq but it is not available in Assemblies — MD SHAHIDUL ISLAM, Mar 21 '16 at 05:09
This link will help you http://stackoverflow.com/questions/15783954/c-sharp-get-computers-mac-address-offline — Sid, Mar 21 '16 at 05:12

score 1 · Answer 1 · answered Mar 21 '16 at 05:11

Since you are in .net version 3.0 you cannot use Linq query as above. Use a simple foreach loop as shown below to iterate through the list and fetch the value.

foreach(var nic in NetworkInterface.GetAllNetworkInterfaces())
{
   if(nic.OperationalStatus == OperationalStatus.Up)
   {
    return nic.GetPhysicalAddress();
   }
}
return string.Empty();

score 0 · Answer 2 · answered Mar 21 '16 at 05:09

0

The feature System.Linq was introduced in the .NET Framework 3.5. Please refer this link https://msdn.microsoft.com/en-us/library/system.linq(v=vs.90).aspx

If you are using .NET 3.5 then add the update the references.

answered Mar 21 '16 at 05:09

Thiru

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C#: MAC addres reading

2 Answers2