如何在这个保存和加载文件的C#脚本中使用类？

如何在这个保存和加载文件的C#脚本中放置类。我目前正在学习C#。我必须用C#为学校制作一个项目，它使用类加载和保存文件。我学会了如何使用类，但当我不得不在脚本中使用它时，我真的感到困惑：

  private void button1_Click(object sender, EventArgs e)
    {
        OpenFileDialog open = new OpenFileDialog();

        if (open.ShowDialog() == DialogResult.OK) ;
        {
            StreamReader read = new StreamReader(File.OpenRead(open.FileName));
            textBox1.Text = read.ReadToEnd();
            read.Dispose(); 
        }
    }

    private void button2_Click(object sender, EventArgs e)
    {
        SaveFileDialog save = new SaveFileDialog();

        if (save.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            StreamWriter write = new StreamWriter(File.Create(save.FileName));

            write.Write(textBox1.Text);
            write.Dispose();
        }
    }

---

我认为你练习的重点是把责任分开

每个班级只能完成一项任务。

根据这一原则，在逻辑上将程序分为三个级别（UI、业务和数据层）是一种很好的做法

关于这一点有很多要讨论的，所以我建议您看看坚实的原则和三层体系结构

为了帮助您，我建议您按如下方式更改代码（本例使用三个级别，但如果您使用两个级别，就足够了，您的老师不会怀疑您收到了提示）

---

为什么要麻烦？查看

System.File

。特别是，

ReadAllText

和

writealtext

方法。如果要将类保存/加载为文件。您可以查看XMLReader。看看这个：您正在该代码中使用类-

OpenFileDialog

，

StreamReader

，

文件

。等等都是班级。此外，这里包含的所有代码都必须在其自己的类中（我猜它可能被称为

Form1

）。但是，是否要求必须创建新类才能将文件加载到文本框中/将文件从文本框保存到文件中？

   // You User Interface, should use Business level classes (not data)
    class YourForm
    {
        private readonly YourService _myLogicService;

        public YourForm()
        {
            _myLogicService = new YourService(new YourFilePersistor());
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog open = new OpenFileDialog();
            if (open.ShowDialog() == DialogResult.OK) ;
            {
                textBox1.Text = _myLogicService.Read(open.FileName);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            var toSave = textBox1.Text;

            SaveFileDialog save = new SaveFileDialog();
            if (save.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                _myLogicService.Write(save.FileName, toSave);
            }
        }
    }

    // Data Layer: this class has dependencies from file system 
    // (in future a database can be used but you will not change your business service, just implement the interface)
    public class YourFilePersistor : IPersistor
    {
        public string Read(string filePath)
        {
            return System.IO.File.ReadAllText(filePath); // Or your code
        }

        public void Write(string filePath, string fileContent)
        {
            System.IO.File.WriteAllText(filePath, fileContent); // Or your code
        }
    }

    public interface IPersistor
    {
        string Read(string filePath);

        void Write(string filePath, string fileContent);
    }



    // Service is your "Business Level" for put your application logic on your domain data  
    // Business classes uses intefaces to abstract data layer and work without dependencies from components like database, remote apis and so on...
    public class YourService
    {
        private readonly IPersistor _repository;

        public YourService(IPersistor repository)
        {
            _repository = repository;
        }

        public string Read(string filePath)
        {
            var data = _repository.Read(filePath);

            return data;
        }

        public void Write(string filePath, string fileContent)
        {
            var data = fileContent;
            // here you could do some logic i.e. to validate your data  
            if (string.IsNullOrWhiteSpace(fileContent))
            {
                throw new InvalidOperationException("Data is null");
            }
            // ---

            _repository.Write(filePath, data);
        }
    }