Returning a files name as string

Question

I have a List< FileInfo > fileList and I am trying to make a variable containing the File name like the code below:

var newFileName = fileList.Select(x => x.Name).ToString();

Now I would expect the value of newFileName to be the files name but the value I get is this:

System.Linq.Enumerable+WhereSelectListIterator`2[System.IO.FileInfo,System.String]

I need to get the file name as a string becouse I want to check if another List< string > filesTemp already contains the newFileName.

if (!filesTemp.Contains(newFileName))

Why is the value as I mentioned and how can i get the actual Name of the file?

Thanks for any help

What `Type` of items are in `fileList`? Strings? FileInfo's? — ispiro, Oct 30 '14 at 10:50
http://msdn.microsoft.com/en-us/library/system.io.fileinfo(v=vs.110).aspx use .name — Nick Otten, Oct 30 '14 at 10:54
@Simon: What `Type` of items are in `filesTemp`? `Strings`? `FileInfo`'s? — Tim Schmelter, Oct 30 '14 at 10:57

score 1 · Accepted Answer · answered Oct 30 '14 at 10:59

Select returns a lazily evaluated collection, you need to use FirstOrDefault to get the first value from the collection.

var newFileName = fileList.Select( x => x.Name ).FirstOrDefault();

But that only works for a single file name, you can use the Any method in the if statement instead to check whether or not any of the names from fileList are present in filesTemp.

var isInTemp = fileList.Any( x => filesTemp.Contains( x.Name ) );

score 1 · Answer 2 · edited Oct 30 '14 at 11:42

1

We will get the name of the file from the property FileInfo.Name

As youhave not determined any files in select, You can get file name like following way.

fileList[0].Name

If you want to select file according to name,

fileList.Select(x => x.Name == name).ToList(); // Select file according to specific name.

edited Oct 30 '14 at 11:42

Alfergon

5,463
6
36
56

answered Oct 30 '14 at 11:30

AKHIL K A

59
6

score 0 · Answer 3 · answered Oct 30 '14 at 10:55

0

Replace

var newFileName = fileList.Select(x => x.Name).ToString();

by

IList<string> newFileName = fileList.Select(x => x.Name).ToList();

It will return a list of file names, then do your comparison

answered Oct 30 '14 at 10:55

Aymeric

1,089
7
10

score -1 · Answer 4 · edited May 23 '17 at 12:27

-1

Seems like your problem is about aggregating.

I think the link below should be what you're looking for: Concat all strings inside a List<string> using LINQ

edited May 23 '17 at 12:27

Community

1
1

answered Oct 30 '14 at 10:57

Tjafaas

129
7

Returning a files name as string

4 Answers4