private void but_add_Click(object sender, EventArgs e) { try { if (IsNumber(txt_page.Text) == false) { MessageBox.Show("输入页码错误!"); return; } NewFile = Path.Combine(@"c:\temp\", LoadPage.ToString() + ".jpg"); if (File.Exists(NewFile) == true) { File.Delete(NewFile); } Hlimage._ImgPj(LoadPage, SourFile, NewFile); if (pic1.Image == null) { pic1.Image = Image.FromFile(NewFile); pic1.Visible = true; Page1 = LoadPage; return; } else if (pic2.Image == null) { pic2.Image = Image.FromFile(NewFile); pic2.Visible = true; Page2 = LoadPage; return; } MessageBox.Show("无法添加新的图像!"); return; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }