c# - How to check null collection? -

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i have algorithm select data collection of reportdata

private idictionary<guid, jobstatistic> getagentsstatistics(ilist<guid> agentids) {      var agentreportitems = data in reportdata                             agentid in data.agentids                             agentids.contains(agentid)                             group data agentid;  ... }

but if agentids empty collection? how check situation?

 var agentreportitems = data in reportdata                         agentid in data.agentids                         agentids != null && agentids.contains(agentid)                         group data agentid;

just check if it's null, , if it's not, use did.


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