CODEWITHSUNDEEP
c#stringlistlinqdirectory
Jonathan Martin
Jonathan Martin

Reputation: 129

How can I get a list of DirectoryInfo where the name of the directories contains a string stored in a List<string>?

Suppose I have a list of strings. These strings will be a part of the directory name that I want to open.

var listOfStrings = new List<string>(){"Foo", "Bar", "LocalHost", "SomeIPAddress"};

If this is my list, my directories might look like this:

So I have the code here to load the directory info into a list:

m_jsonDirectories = new DirectoryInfo(@"C:\ProgramData\SCLDDB\ReportLogs\")
    .GetDirectories()
    .OrderByDescending(p_f => p_f.LastWriteTime)
    .ToList();

Right now, I can load all the directories in the master directory into my variable, but I want to add something like:

 .Where(x => x.Name.Contains(/*A string found in my List above*/)

Edit: in the above statement, the parameter x is of type DirectoryInfo. So x.Name should return the Name of the Directory.

I don't know how to search 

List.Any(s => string.Contains(s))

when I don't have a string variable already set. And ideally I'd just want to search each element of my list for a match without individually setting some temporary string variable.

Upvotes: 0

Views: 520

Answers (2)

Harald Coppoolse
Harald Coppoolse

Reputation: 30464

So you have a sequence of DirectoryInfos, and a sequence of strings.

You want to filter the sequence of DirectoryInfos in such a way that only those DirectoryInfos that have a Name that starts with at least one of the strings that is in your sequence of strings.

So if your sequence of strings contains "Foo", than your end result should at least contain all DirectoryInfos whose Name start with Foo.

IEnumerable<string> strings = ...
IEnumerable<DirectoryInfo> directoryInfos = ...

var result = directoryInfos
    .Where(directoryInfo => strings
           .Any(str => directoryInfo.Name.StartsWitch(str));

In words:

From the sequence of all DirectoryInfos, keep only those DirectoryInfos, of which the name of this DirectoryInfo starts with at Any of the strings in the sequence of strings.

Upvotes: 1

k1dev
k1dev

Reputation: 641

.Where(x=> listOfStrings.Any(c=> x.Contains(c))) is what you are looking for.

Upvotes: 1

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