Working With Files
The File class from the System.IO namespace, allows us to work with files:
1 2 3 4 5 | using System.IO; // include the System.IO namespace File.SomeFileMethod(); // use the file class with methods |
The File class has many useful methods for creating and getting information about files.
For example:
| Method | Description |
|---|---|
AppendText() | Appends text at the end of an existing file |
Copy() | Copies a file |
Create() | Creates or overwrites a file |
Delete() | Deletes a file |
Exists() | Tests whether the file exists |
ReadAllText() | Reads the contents of a file |
Replace() | Replaces the contents of a file with the contents of another file |
WriteAllText() | Creates a new file and writes the contents to it. If the file already exists, it will be overwritten. |
Write To a File and Read It
In the following example, we use the WriteAllText() method to create a file named “filename.txt” and write some content to it. Then we use the ReadAllText() method to read the contents of the file:
Example:
1 2 3 4 5 6 7 8 9 | using System.IO; // include the System.IO namespace string writeText = "Hello World!"; // Create a text string File.WriteAllText("filename.txt", writeText); // Create a file and write the content of writeText to it string readText = File.ReadAllText("filename.txt"); // Read the contents of the file Console.WriteLine(readText); // Output the content |
