private void ExportToMapItem_Click(object sender, EventArgs e) { try { if (exportmapFrm == null || exportmapFrm.IsDisposed) { exportmapFrm = new ExportMapFrm(this.axMapcontrol); } exportmapFrm.GetGeometry = this.axMapcontrol.ActiveView.Extent; exportmapFrm.IsRgion = false; exportmapFrm.Show(); //激活窗体并赋予它焦点 exportmapFrm.Activate(); } catch (Exception ex) { MessageBox.Show(ex.Message); } }