Delete Item from array

Question

How can I delete a "FolderName" item from directoryPaths array? Not physically from the path, only from directoryPaths.

string[] directoryPaths = Directory.GetDirectories(@path);

Sergey Kalinichenko · Accepted Answer · 2015-01-12 00:48:00Z

2

You can do this change in place by finding the element that you wish to delete (say, at index del), move all elements after del down by one index, and then resize the array down by calling Array.Resize:

int del = Array.IndexOf(directoryPaths, @path+"\\Desktop Files"); // Pick an index to delete
for (int i = del+1 ; i != directoryPaths.Length ; i++) {
    directoryPaths[i-1] = directoryPaths[i];
}
Array.Resize(directoryPaths.Length-1);

edited Jan 12, 2015 at 0:48

answered Jan 12, 2015 at 0:14

Sergey Kalinichenko

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5 Comments

Sebastian Corneliu Vîrlan Over a year ago

But I don`t know the index of the folder because is not the same every time. I only know the name.

Sergey Kalinichenko Over a year ago

@SebastianCorneliuVîrlan You can use IndexOf method to find the index (see the edit).

Sebastian Corneliu Vîrlan Over a year ago

int del = Array.IndexOf(directoryPaths, "Desktop Files"); is -1 . So is correct to use Desktop Files or should I provide full path?

Sergey Kalinichenko Over a year ago

@SebastianCorneliuVîrlan Print out the values in a loop, and see which string represents the path that you want deleted. Then supply that path to IndexOf as the second parameter.

Sebastian Corneliu Vîrlan Over a year ago

int del = Array.IndexOf(directoryPaths, @path+"\\Desktop Files"); please modify the post to make as Answer.

EZI · Accepted Answer · 2015-01-12 00:13:49Z

2

Use List, instead of array.

var directoryPaths = Directory.GetDirectories((@path).ToList(); 
directoryPaths.Remove(FolderName);

answered Jan 12, 2015 at 0:13

EZI

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Comments

Richard Schneider · Accepted Answer · 2015-01-12 00:14:14Z

1

using System.Linq;

var paths = directoryPaths
  .Where(p => p != folderName)
  .ToArray();

answered Jan 12, 2015 at 0:14

Richard Schneider

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1 Comment

Sebastian Corneliu Vîrlan Over a year ago

Is correct if:

var directoryPaths = directoryPathsx                   .Where(p => p != @path + "\\Desktop Files")                   .ToArray();

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