CODEWITHSUNDEEP
c#linq
nlstack01
nlstack01

Reputation: 839

Remove From Duplicate Starting Names From List Linq

I have a list of paths that look like //servername/d$/directory

I am getting the serverName from the path with the following

 var host = somePath.Split(new[] { '\\' }, StringSplitOptions.RemoveEmptyEntries).FirstOrDefault();

I want to refine this list to only 1 server Name listed (say the first one found)

Example
if the list contains
//serverA/d$/directoryA
//serverA/d$/directoryB
//serverA/d$/directoryC
//serverB/d$/directoryD
//serverB/d$/directoryE

the list would turn into
//serverA/d$/directoryA
//serverB/d$/directoryD

Upvotes: 1

Views: 35

Answers (1)

Rufus L
Rufus L

Reputation: 37020

You can group them by the server name (by trimming the start and splitting on the / character and taking the first item), and then select the first item from each group into a new list:

var serverNames = new List<string>
{
    "//serverA/d$/directoryA",
    "//serverA/d$/directoryB",
    "//serverA/d$/directoryC",
    "//serverB/d$/directoryD",
    "//serverB/d$/directoryE",
};

var results = serverNames
    .GroupBy(name => name.TrimStart('/').Split('/')[0])
    .Select(group => group.First())
    .ToList();

From your first code example it's not clear if the paths begin with \, so to handle both cases you can do:

var results = serverNames
    .GroupBy(name => name.TrimStart('\\', '/', ' ').Split('\\', '/')[0])
    .Select(group => group.First())
    .ToList();

Upvotes: 4

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