Check if a folder exist in a directory and create

问题:

How can I check if directory C:/ contains a folder named MP_Upload, and if it does not exist, create the folder automatically?

I am using Visual Studio 2005 C#.

回答1:

This should help:

using System.IO;
...

string path = @"C:\MP_Upload";
if(!Directory.Exists(path))
{
    Directory.CreateDirectory(path);
}

回答2:

using System.IO;
...

Directory.CreateDirectory(@"C:\MP_Upload");

Directory.CreateDirectory does exactly what you want: It creates the directory if it does not exist yet. There's no need to do an explicit check first.

Any and all directories specified in path are created, unless they already exist or unless some part of path is invalid. The path parameter specifies a directory path, not a file path. If the directory already exists, this method does nothing.

(This also means that all directories along the path are created if needed: CreateDirectory(@"C:\a\b\c\d") suffices, even if C:\a does not exist yet.)

---

Let me add a word of caution about your choice of directory, though: Creating a folder directly below the system partition root C:\ is frowned upon. Consider letting the user choose a folder or creating a folder in %APPDATA% or %LOCALAPPDATA% instead (use Environment.GetFolderPath for that). The MSDN page of the Environment.SpecialFolder enumeration contains a list of special operating system folders and their purposes.

回答3:

if(!System.IO.Directory.Exists(@"c:\mp_upload"))
{
     System.IO.Directory.CreateDirectory(@"c:\mp_upload");
}

回答4:

This should work

if(!Directory.Exists(@"C:\MP_Upload")) {
    Directory.CreateDirectory(@"C:\MP_Upload");
}

回答5:

using System;
using System.IO;
using System.Windows.Forms;

namespace DirCombination 
{
    public partial class DirCombination : Form
    {
        private const string _Path = @"D:/folder1/foler2/folfer3/folder4/file.txt";
        private string _finalPath = null;
        private string _error = null;

        public DirCombination()
        {
            InitializeComponent();

            if (!FSParse(_Path))
                Console.WriteLine(_error);
            else
                Console.WriteLine(_finalPath);
        }

        private bool FSParse(string path)
        {
            try
            {
                string[] Splited = path.Replace(@"//", @"/").Replace(@"\\", @"/").Replace(@"\", "/").Split(':');
                string NewPath = Splited[0] + ":";
                if (Directory.Exists(NewPath))
                {                    
                    string[] Paths = Splited[1].Substring(1).Split('/');

                    for (int i = 0; i < Paths.Length - 1; i++)
                    {
                        NewPath += "/";
                        if (!string.IsNullOrEmpty(Paths[i]))
                        {
                            NewPath += Paths[i];
                            if (!Directory.Exists(NewPath))
                                Directory.CreateDirectory(NewPath);
                        }
                    }

                    if (!string.IsNullOrEmpty(Paths[Paths.Length - 1]))
                    {
                        NewPath += "/" + Paths[Paths.Length - 1];
                        if (!File.Exists(NewPath))
                            File.Create(NewPath);
                    }
                    _finalPath = NewPath;
                    return true;
                }
                else
                {
                    _error = "Drive is not exists!";
                    return false;
                }
            }
            catch (Exception ex)
            {
                _error = ex.Message;
                return false;
            }
        }
    }
}

回答6:

    String path = Server.MapPath("~/MP_Upload/");
    if (!Directory.Exists(path))
    {
        Directory.CreateDirectory(path);
    }

回答7:

You can try this..

using System.IO;string path = "C:\MP_Upload";if(!Directory.Exists(path)){
   Directory.CreateDirectory(path);}