Friday, 27 July 2012

.Net Tips, C# Tips : Get list of all files of directory or folder using LINQ using .Net Framework 4 with C# Examples and VB.Net Examples

You can get list of all files in particular directory or folder and it's all sub directories.
.NET Framework 4 allow to enumerate directories and files using methods that returns enumerable collections. There is a also a methods of get enumerable collections for DirectoryInfo , FileSystemInfo and FileInfo objects.
Earlier version of .Net framework provide only array of these collections.
Performance wise enumerable collection is better than arrays.

We are using .NET Framework 4 feature in this example.

We are Using "EnumerateFiles" Method of "Directory" class for get all files in directory.
We are using LINQ query to get list.
For this you have to use System.Collections.Generic and System.IO namespaces.

Here is example for this.
In this example we get list of files name from given directory.
In output you can see that there is a sub folder "New Folder" in "Imp" folder. You can also get this sub folder's file in list.

C# Example :
        var lstFiles = from tmpFile in Directory.EnumerateFiles(@"D:\Imp\","*.*", SearchOption.AllDirectories)
                    select new
                        File = tmpFile

        Response.Write("<br/><b>File Paths:</b>");
        foreach (var objFile in lstFiles)
            Response.Write(string.Format( "<br/>{0}", objFile.File));

        Response.Write(string.Format("<br/><br/><b>Total {0} files found.</b>", lstFiles.Count().ToString())); Example :
        Dim lstFiles = From tmpFile In Directory.EnumerateFiles("D:\Imp\", "*.*", SearchOption.AllDirectories)
                       Select New With { _
                           Key .File = tmpFile _

        Response.Write("<br/><b>File Paths:</b>")
        For Each objFile In lstFiles
            Response.Write(String.Format("<br/>{0}", objFile.File))

        Response.Write(String.Format("<br/><br/><b>Total {0} files found.</b>", lstFiles.Count().ToString()))

Output :

This type of C# Tips is very useful in day to day programming life.

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