File.AppendAllLines Method Appends lines to a file, and then closes the file. : File « File Stream « C# / C Sharp

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File.AppendAllLines Method Appends lines to a file, and then closes the file.

 



using System;

using System.IO;

using System.Linq;



class Program

{

    static string dataPath = @"c:\t.txt";



    static void Main(string[] args)

    {



        var text = from line in File.ReadLines(dataPath)

                   where (line.Contains("a"))

                   select line;



        File.WriteAllLines(@"C:\data.txt", text);



    }

}

Related examples in the same category

1.	Get file Creation Time
2.	Delete a file
3.	Get File Access Control
4.	illustrates the FileAttributes enumeration
5.	illustrates the FileInfo class
6.	illustrates the FileSystemWatcher class
7.	File class to check whether a file exists, open and read
8.	Uses methods in the File class to check whether a file exists
9.	Uses methods in the File class to check the status of a file
10.	File Class
11.	File.AppendAllText Opens a file, appends the specified string to the file
12.	File.AppendAllText Method Appends the string to the file, creating the file if it does not exist.
13.	File.AppendText Creates a StreamWriter that appends UTF-8 encoded text to an existing file.
14.	File.Copy Method Copies file to a new file
15.	File.Create Creates or overwrites a file in the specified path.
16.	File.Create Method (String, Int32) Creates or overwrites the specified file.
17.	File.CreateText Method Creates or opens a file for writing UTF-8 encoded text.
18.	File.Decrypt Decrypts a file
19.	File.Exists Determines whether the specified file exists.
20.	File.GetAccessControl Gets a FileSecurity object that encapsulates the access control list
21.	File.GetAttributes Method Gets the FileAttributes of the file on the path.
22.	File.GetCreationTime Method Returns the creation date and time of the specified file or directory.
23.	File.GetLastAccessTime Method Returns the date and time the specified file or directory was last accessed.
24.	File.GetLastWriteTime Returns the date and time the specified file or directory was last written to.
25.	File.Move Moves a file to a new location
26.	File.Open Opens a FileStream on the specified path with read/write access.
27.	File.Open Method (String, FileMode, FileAccess)
28.	File.Open Method (String, FileMode, FileAccess, FileShare)
29.	File.OpenRead Method Opens an existing file for reading.
30.	File.OpenText Method Opens an existing UTF-8 encoded text file for reading.
31.	File.OpenWrite Method Opens an existing file or creates a new file for writing.
32.	File.ReadAllLines Method Opens a text file, reads all lines of the file, and then closes the file.
33.	File.ReadAllLines Method (String, Encoding)
34.	File.ReadLines Method
35.	File.Replace Replaces contents of file
36.	File.SetLastAccessTime Sets the date and time the specified file was last accessed.
37.	File.SetLastWriteTime

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