public static calculator GetInstance()
{
if (Instance == null)
{
Instance = new calculator();
}
return(Instance);
}
private void 添加ToolStripMenuItem_Click(object sender, EventArgs e)
{
calculator newWindow = new calculator();
newWindow.Show(this.dockPanel1, AppConfig.ms_floatform);
}
private void ShowFloatform()
{
calculator frmFun = calculator.GetInstance();
frmFun.Show(this.dockPanel1, AppConfig.ms_floatform);
}
private void floatform_FormClosed(object sender, FormClosedEventArgs e)
{
Instance = null; // 否则下次打开时报错，提示“无法访问已释放对象”
}
