private static bookSearch_reader _instance = null; // 单例模式
public static bookSearch_reader CreateInstance()
{
if (_instance == null)
{
_instance = new bookSearch_reader();
}
return(_instance);
}
private void bookSearch_available_FormClosing(object sender, FormClosingEventArgs e)
{
bkID = -1;
_instance = null;
this.Dispose();
}