private void contextMenuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
MissionForm missionForm = MissionForm.CreateInstrance();
missionForm.ShowMission(e.ClickedItem.Text, currentPlace);
missionForm.Show();
}
/// <summary>
/// 单例模式
/// </summary>
/// <returns></returns>
public static MissionForm CreateInstrance()
{
if (frm == null || frm.IsDisposed)
{
frm = new MissionForm();
}
return(frm);
}