dispose method in c# with example
public void Dispose()
{
// Dispose of unmanaged resources.
Dispose(true);
// Suppress finalization.
GC.SuppressFinalize(this);
}dispose method in c# with example
public void Dispose()
{
// Dispose of unmanaged resources.
Dispose(true);
// Suppress finalization.
GC.SuppressFinalize(this);
}dispose method in c# with example
using Microsoft.Win32.SafeHandles;
using System;
using System.Runtime.InteropServices;
public class DisposableStreamResource : IDisposable
{
// Define constants.
protected const uint GENERIC_READ = 0x80000000;
protected const uint FILE_SHARE_READ = 0x00000001;
protected const uint OPEN_EXISTING = 3;
protected const uint FILE_ATTRIBUTE_NORMAL = 0x80;
private const int INVALID_FILE_SIZE = unchecked((int)0xFFFFFFFF);
// Define Windows APIs.
[DllImport("kernel32.dll", EntryPoint = "CreateFileW", CharSet = CharSet.Unicode)]
protected static extern SafeFileHandle CreateFile(
string lpFileName, uint dwDesiredAccess,
uint dwShareMode, IntPtr lpSecurityAttributes,
uint dwCreationDisposition, uint dwFlagsAndAttributes,
IntPtr hTemplateFile);
[DllImport("kernel32.dll")]
private static extern int GetFileSize(
SafeFileHandle hFile, out int lpFileSizeHigh);
// Define locals.
private bool _disposed = false;
private readonly SafeFileHandle _safeHandle;
private readonly int _upperWord;
public DisposableStreamResource(string fileName)
{
if (string.IsNullOrWhiteSpace(fileName))
{
throw new ArgumentException("The fileName cannot be null or an empty string");
}
_safeHandle = CreateFile(
fileName, GENERIC_READ, FILE_SHARE_READ, IntPtr.Zero,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, IntPtr.Zero);
// Get file size.
Size = GetFileSize(_safeHandle, out _upperWord);
if (Size == INVALID_FILE_SIZE)
{
Size = -1;
}
else if (_upperWord > 0)
{
Size = (((long)_upperWord) << 32) + Size;
}
}
public long Size { get; }
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
// Dispose of managed resources here.
if (disposing)
{
_safeHandle?.Dispose();
}
// Dispose of any unmanaged resources not wrapped in safe handles.
_disposed = true;
}
}Copyright © 2021 Codeinu
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