The OpenWrite method opens a file for writing. If file does not exist, it creates a new file and opens if for writing. The OpenWrite method takes a file name as parameter and returns a FileStream object on the specified file.
FileStream fs = fi.OpenWrite();
Once we have a FileStream object, we can use its Write method to write to the file. The WriteMethod takes a byte array. The following code snippet creates a byte array and passes it to the Write method of the FileStream.
Byte[] info = new UTF8Encoding(true).GetBytes("New File using OpenWrite Method n");
fs.Write(info, 0, info.Length);
The following lists the complete code sample.
string fileName = @"C:fileName.txt";
FileInfo fi = new FileInfo(fileName);
// If file does not exist, create file
if (!fi.Exists)
{
//Create the file.
using (FileStream fs = fi.Create())
{
Byte[] info = new UTF8Encoding(true).GetBytes("File Start");
fs.Write(info, 0, info.Length);
}
}
try
{
// Open a file and add some contents to it
using (FileStream fs = fi.OpenWrite())
{
Byte[] info = new UTF8Encoding(true).GetBytes("New File using OpenWrite Method n");
fs.Write(info, 0, info.Length);
info = new UTF8Encoding(true).GetBytes("----------START------------------------ n");
fs.Write(info, 0, info.Length);
info = new UTF8Encoding(true).GetBytes("Author: Mahesh Chand n");
fs.Write(info, 0, info.Length);
info = new UTF8Encoding(true).GetBytes("Book: ADO.NET Programming using C#n");
fs.Write(info, 0, info.Length);
info = new UTF8Encoding(true).GetBytes("----------END------------------------");
fs.Write(info, 0, info.Length);
}
// Read file contents and display on the console
using (FileStream fs = File.OpenRead(fileName))
{
byte[] byteArray = new byte[1024];
UTF8Encoding fileContent = new UTF8Encoding(true);
while (fs.Read(byteArray, 0, byteArray.Length) > 0)
{
Console.WriteLine(fileContent.GetString(byteArray));
}
}
}
catch (Exception Ex)
{
Console.WriteLine(Ex.ToString());
}
NOTE:
A File must be opened using an IO resource before it can be read or write to. A file can be opened to read and/or write purpose. The FileInfo class provides four methods to open a file.
+ Open
+ OpenRead
+ OpenText
+ OpenWrite
