如何让 Designer.cs 访问 C# 中的其他类

Question

背后的故事是，为了组织我的代码，我创建了一个名为 Printing.cs 的新类，并将我的代码从我的 main.cs 中转储到那里。 在我的designer.cs 我有这个：this.DVPrintDocument.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.DVPrintDocument_PrintPage);我收到一条错误消息，说不包含定义并且没有找到扩展方法。我怎样才能让 Designer.cs 可以访问其他类？

这是我想让designer.cs看的类：

using static TicketingSystem.TicketingSystem;

namespace TicketingSystem
{
   class Printing
   {
    TicketingSystem ticketingSystem;
        public Printing(TicketingSystem ticketingSystem) => 
this.ticketingSystem = ticketingSystem;


    public void DVPrintDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        Bitmap r3tsLogo = Properties.Resources.rt3slogo;
        Image image1 = r3tsLogo; //image 1 is r3tsLogo
        e.Graphics.DrawImage(image1, 350, 0, image1.Width, image1.Height);
        // e.Graphics.DrawString("Employee Name:" + employee.Text, new Font("Arial", 15, FontStyle.Regular), Brushes.Black, new Point(50, 200)); //Put to bottom of paper
        e.Graphics.DrawString("Address:", new Font("Impact", 12, FontStyle.Regular), Brushes.Black, new Point(300, 90));//change the new point to put text on different part of paper.
        e.Graphics.DrawString("Room 61", new Font("Arial", 10, FontStyle.Regular), Brushes.Black, new Point(370, 94)); //This line of code connects to Code line 151   
        e.Graphics.DrawString("Email:", new Font("Impact", 12, FontStyle.Regular), Brushes.Black, new Point(300, 120));//change the new point to put text on different part of paper.
        e.Graphics.DrawString("email@email.com", new Font("Arial", 10, FontStyle.Regular), Brushes.Black, new Point(350, 124)); //This line of code connects to Code line 154
        e.Graphics.DrawString("Date: " + DateTime.Now, new Font("Arial", 13, FontStyle.Regular), Brushes.Black, new Point(300, 150));
        e.Graphics.DrawString(ticketingSystem.dashes.Text, new Font("Arial", 12), Brushes.Black, new Point(0, 160));
      }

抱歉，我仍在学习 C#，但这是我学校班级的项目。任何帮助将不胜感激！

Answer 1

formXXXX.designer.cs 文件由 WinForms 设计器生成，用于保留您的用户界面对象并使用您通过 Winform Designer 界面所做的设置初始化它们的属性。
由于此类文件由 WinForms 基础架构创建和维护，因此您不应尝试在此处添加自己的代码或手动更改任何内容。
（此外，每次更改表单时，都会重写此文件）

因此，您只需像以前一样将事件处理程序 DVPrintDocument_PrintPage 添加回您的主窗体。但是没有人阻止您在调用打印类中的代码的事件处理程序中编写一些东西。

类似的东西

在您的主 form.cs 文件中读取 DVPrintDocument 的事件处理程序

public void DVPrintDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
     Printing print = new Printing(ticketingSystem);
     print.PrintPageHandler(sender, e);
}

在你的印刷课上

public class Printing
{
    TicketingSystem ticketingSystem;
    public Printing(TicketingSystem ticketingSystem) => 
                    this.ticketingSystem = ticketingSystem;


    public void PrintPageHandler(object sender, PrintPageEventArgs e)
    {
        Bitmap r3tsLogo = Properties.Resources.rt3slogo;
        Image image1 = r3tsLogo; //image 1 is r3tsLogo
        // remainder of your current code 
       .....
    }
}