private void btn_linearPO_Click(object sender, EventArgs e) { try { //实例化linearPOForm窗体 linearPOForm linearForm = new linearPOForm(); //点击确定按钮 if (linearForm.ShowDialog() == DialogResult.OK) { //得到斜率 double scaling = Convert.ToDouble(linearForm.GetScaling); //得到偏移量 double offset = Convert.ToDouble(linearForm.GetOffset); imageProcessing.linearPO(scaling, offset); } Invalidate(); } catch (NullReferenceException exp) { MessageBox.Show("请选择图片"); } catch (Exception exp) { MessageBox.Show(exp.Message); } }