/// <summary>
/// Registers a form for receiving a callback notification when another instance was started. This typically should be the main form.
/// </summary>
/// <param name="form">The form to register.</param>
public void RegisterForm(Form form)
{
if (IsAnotherInstanceRunning)
{
throw new InvalidOperationException("The application can't listen for notifications, as it is not the first instance.");
}
if (form == null)
{
throw new ArgumentNullException(nameof(form));
}
if (_forms.Contains(form))
{
throw new ArgumentException("The specified form is already registered.", nameof(form));
}
// Create filter if needed.
if (_messageFilter == null)
{
_messageFilter = new CopyDataMessageFilter(this);
}
// If we are not currently listening, assign this form.
if (_messageFilter.Handle == IntPtr.Zero)
{
_messageFilter.AssignHandle(form.Handle);
}
// Keep a list of all registered forms.
form.Disposed += Form_Disposed;
_forms.Add(form);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
/// <param name="disposing">True if disposing.</param>
private void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
if (disposing)
{
_messageFilter?.ReleaseHandle();
_messageFilter = null;
}
if (_mutexOwned)
{
_mutex.ReleaseMutex();
}
_mutex.Dispose();
_disposed = true;
}
/// <summary>
/// Registers a form for receiving a callback notification when another instance was started. This typically should be the main form.
/// </summary>
/// <param name="form">The form to register.</param>
public void RegisterForm(Form form)
{
if (IsAnotherInstanceRunning)
throw new InvalidOperationException("The application can't listen for notifications, as it is not the first instance.");
if (form == null)
throw new ArgumentNullException(nameof(form));
if (_forms.Contains(form))
throw new ArgumentException("The specified form is already registered.", nameof(form));
// Create filter if needed.
if (_messageFilter == null)
_messageFilter = new CopyDataMessageFilter(this);
// If we are not currently listening, assign this form.
if (_messageFilter.Handle == IntPtr.Zero)
_messageFilter.AssignHandle(form.Handle);
// Keep a list of all registered forms.
form.Disposed += Form_Disposed;
_forms.Add(form);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
/// <param name="disposing">True if disposing.</param>
private void Dispose(bool disposing)
{
if (_disposed) return;
if (disposing)
{
_messageFilter?.ReleaseHandle();
_messageFilter = null;
}
if (_mutexOwned) _mutex.ReleaseMutex();
_mutex.Dispose();
_disposed = true;
}
