C# File Open(String, FileMode, FileAccess, FileShare)
Description
File Open(String, FileMode, FileAccess, FileShare) Opens
a FileStream on the specified path, having the specified mode with read,
write, or read/write access and the specified sharing option.
Syntax
File.Open(String, FileMode, FileAccess, FileShare) has the following syntax.
public static FileStream Open(
string path,//from w w w . j a v a2 s.c o m
FileMode mode,
FileAccess access,
FileShare share
)
Parameters
File.Open(String, FileMode, FileAccess, FileShare) has the following parameters.
path- The file to open.mode- A FileMode value that specifies whether a file is created if one does not exist, and determines whether the contents of existing files are retained or overwritten.access- A FileAccess value that specifies the operations that can be performed on the file.share- A FileShare value specifying the type of access other threads have to the file.
Returns
File.Open(String, FileMode, FileAccess, FileShare) method returns A FileStream on the specified path, having the specified mode with read,
write, or read/write access and the specified sharing option.
Example
The following example opens a file with read-only access and with file sharing disallowed.
//w w w .ja va 2s . com
using System;
using System.IO;
using System.Text;
class Test
{
public static void Main()
{
string path = "MyTest.txt";
if (!File.Exists(path))
{
using (FileStream fs = File.Create(path))
{
Byte[] info = new UTF8Encoding(true).GetBytes("from java2s.com.");
fs.Write(info, 0, info.Length);
}
}
using (FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.None))
{
byte[] b = new byte[1024];
UTF8Encoding temp = new UTF8Encoding(true);
while (fs.Read(b,0,b.Length) > 0)
{
Console.WriteLine(temp.GetString(b));
}
try
{
using (FileStream fs2 = File.Open(path, FileMode.Open))
{
}
}
catch (Exception e)
{
Console.Write("Opening the file twice is disallowed.");
Console.WriteLine(", as expected: {0}", e.ToString());
}
}
}
}