Linq syntax required for string array to string conversion

Question

I've the list of selected files in a array from particular folder.

String[] allfiles = System.IO.Directory.GetFiles(Target, "*.*", System.IO.SearchOption.AllDirectories);

I required to convert all of this files into the string variable and each line append with "\n" character with help of LINQ. I can do it as like below with help of looping but i required in LINQ Syntax.

String strFileName = string.Empty;

for ( int i = 0; i < allfiles.Length ; i++)
  strFileName = strFileName + "\n" + allfiles[1] ;

@HamletHakobyan Obviously. If it could, why would he be asking here? — Nolonar
– Nolonar, Commented Mar 7, 2013 at 13:40

Tim Schmelter · Accepted Answer · 2013-03-07 13:31:14Z

7

First, i would use Directory.EnumerateFiles instead, so you don't need to wait until all files are read. Then you can use string.Join(Environment.NewLine, allFileNames):

IEnumerable<string> allFileNames = Directory.EnumerateFiles(Target, "*.*", System.IO.SearchOption.AllDirectories);
string strFileNames  = string.Join(Environment.NewLine, allFileNames);

answered Mar 7, 2013 at 13:31

Tim Schmelter

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Comments

Jamiec · Accepted Answer · 2013-03-07 13:29:52Z

5

Easy enough

String.Join("\n",allFiles)

answered Mar 7, 2013 at 13:29

Jamiec

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Comments

Thomas Levesque · Accepted Answer · 2013-03-07 13:33:30Z

4

You don't need Linq to do that, you can use the String.Join method as illustrated in Jamiec's answer.

Now, if you really want to do it with Linq, you could use Aggregate:

string strFileName = allfiles.Aggregate("", (acc, file) => acc + "\n" + file);

Or better, using a StringBuilder:

string strFileName = allfiles.Aggregate(
                                  new StringBuilder(),
                                  (acc, file) => acc.AppendLine(file),
                                  acc => acc.ToString());

answered Mar 7, 2013 at 13:33

Thomas Levesque

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Sergey Berezovskiy · Accepted Answer · 2013-03-07 13:33:56Z

2

If it's required to use LINQ:

var result = allFiles.Aggregate(new StringBuilder(),
                                (sb, s) => sb.AppendLine(s),
                                sb => sb.ToString());

answered Mar 7, 2013 at 13:33

Sergey Berezovskiy

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Slawomir Pasko · Accepted Answer · 2013-03-07 13:31:13Z

0

You don't need linq for that. Just use simple string.Join() method.

string.Join("\n",allfiles);

answered Mar 7, 2013 at 13:31

Slawomir Pasko

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Rajesh Subramanian · Accepted Answer · 2013-03-07 13:30:51Z

-1

Following should work

String.Join(delimiter,stringArray);

answered Mar 7, 2013 at 13:30

Rajesh Subramanian

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ywm · Accepted Answer · 2013-03-07 18:02:37Z

-1

You don't need Linq to do this you can use the string.Join() method instead.

String strFileName = string.Join("\n", allfiles);

edited Mar 7, 2013 at 18:02

answered Mar 7, 2013 at 13:30

ywm

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1 Comment

Jamiec Over a year ago

There is no overload of String.Concat which takes a string and an IEnumerable<string>

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