如何转换 System.Collections.Generics.IENumerable<String> 串起来

Question

I want to convert a variable obtained from a Directory.EnumerateFiles method to a string . This Variable Contains a set of file paths of folders that contain the FileServer.config in them

 var foundFiles = Directory.EnumerateFiles(rootDirectory, "fileserver.config", 

    SearchOption.AllDirectories);
    var RepositoryName = Path.GetFileName(Path.GetDirectoryName(foundFiles));

Here string rootDirectory is a particular path

Any way I can achieve this ?

As per my current implementation I get the error "Cannot convert System.Collections.Generics.IENumerable to string " underlined Right under the foundFiles variable.

Answer 1

My original answer

Originally I thought that you only expected there to be a single file named fileserver.config and you wanted the path to that file - which can be done using FirstOrDefault() .

using System.Linq;

String firstFileMatch = Directory
    .EnumerableFiles( rootDirectory, "fileserver.config" )
    .FirstOrDefault();

if( firstFileMatch == null )
{
    throw new FileNotFoundException();
}

return Path.GetDirectoryName( Path.GetDirectoryName( fileFirstMatch ) );

New answer

In a follow-up comment you said you wanted to print all of the files - so that's straightforward too, using String.Join :

using System.IO;
using System.Linq;

IEnumerable<String> fileNames = new DirectoryInfo( rootDirectoryPath )
    .EnumerableFiles( "fileServer.config", SearchOption.AllDirectories )
    .Select( fi => fi.Directory.FullName )
    .Select( dirPath => dirPath.Substring( rootDirectoryPath.Length ) );

String allNames = String.Join( "\r\n\r\n", fileNames );
MessageBox.Show( allNames );