The OpenText method opens an existing UTF-8 encoded text file for reading. The OpenText method takes a file name as a parameter and returns a StreamReader object.
StreamReader reader = fi.OpenText();
Once we have a StreamReader object, we can use its Read or ReadLine methods to read the contents. The ReadLine method reads one line at a time. The following code snippet loops through the entire content of a SteamReader and reads and prints one line at a time.
while ((s = reader.ReadLine()) != null)
{
Console.WriteLine(s);
}
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
{
using (StreamReader reader = fi.OpenText())
{
string s = "";
while ((s = reader.ReadLine()) != null)
{
Console.WriteLine(s);
}
}
}
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
