尝试在不使用 SaveFileDialog 的情况下保存文件

Question

我正在创建一个文本编辑器，但我卡在 SaveFileDialog 窗口打开 并要求覆盖当前打开的文件。

我在 SO 上看到了所有类似的问题，但没有一个能够帮助我。我什至尝试过这个问题的代码：“Saving file without dialog”Saving file without dialog

我的程序遇到了 FileName 问题。

这是我目前的代码

namespace Text_Editor
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Clear();
        }

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

            open.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
            open.Title = "Open File";
            open.FileName = "";

            if (open.ShowDialog() == DialogResult.OK)
            {
                this.Text = string.Format("{0}", Path.GetFileNameWithoutExtension(open.FileName));
                StreamReader reader = new StreamReader(open.FileName);
                richTextBox1.Text = reader.ReadToEnd();
                reader.Close();
            }
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

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

            save.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
            save.Title = "Save File";

            save.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

            if (save.ShowDialog() == DialogResult.OK)
            {
                StreamWriter writer = new StreamWriter(save.FileName);
                writer.Write(richTextBox1.Text);
                writer.Close();
            }
        }

        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog saving = new SaveFileDialog();

            saving.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

            saving.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
            saving.Title = "Save As";
            saving.FileName = "Untitled";

            if (saving.ShowDialog() == DialogResult.OK)
            {
                StreamWriter writing = new StreamWriter(saving.FileName);
                writing.Write(richTextBox1.Text);
                writing.Close();
            }
        }

    }
}

所以我的问题是如何修改我的代码，以便我可以保存当前打开的文件，而无需每次都打开 SaveFileDialog 框？

我明白这与我正在调用 .ShowDialog 的事实有关，但我不知道如何修改它。

Answer 1

打开文件时，将FileName 保存在表单级变量或属性中。

现在在保存文件时，您可以使用此 FileName 而不是从 FileOpenDialog 获取它。

首先声明一个变量来保存表单级别的文件名

// declare at form level
private string FileName = string.Empty;

打开文件时，将文件名保存在这个变量中

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

    open.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
    open.Title = "Open File";
    open.FileName = "";

    if (open.ShowDialog() == DialogResult.OK)
    {
        // save the opened FileName in our variable
        this.FileName = open.FileName;
        this.Text = string.Format("{0}", Path.GetFileNameWithoutExtension(open.FileName));
        StreamReader reader = new StreamReader(open.FileName);
        richTextBox1.Text = reader.ReadToEnd();
        reader.Close();
    }
}

并且在做SaveAs操作的时候，更新这个变量

private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
{
    SaveFileDialog saving = new SaveFileDialog();

    saving.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

    saving.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
    saving.Title = "Save As";
    saving.FileName = "Untitled";

    if (saving.ShowDialog() == DialogResult.OK)
    {
        // save the new FileName in our variable
        this.FileName = saving.FileName;
        StreamWriter writing = new StreamWriter(saving.FileName);
        writing.Write(richTextBox1.Text);
        writing.Close();
    }
}

然后可以像这样修改保存功能：

private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(this.FileName))
    {
        // call SaveAs 
        saveAsToolStripMenuItem_Click(sender, e);
    } else {
        // we already have the filename. we overwrite that file.
        StreamWriter writer = new StreamWriter(this.FileName);
        writer.Write(richTextBox1.Text);
        writer.Close();
    }
}

在新建（和关闭）函数中，你应该清除这个变量

private void newToolStripMenuItem_Click(object sender, EventArgs e)
{
    // clear the FileName
    this.FileName = string.Empty;
    richTextBox1.Clear();
}

Answer 2

例如在你的类中创建一个新的字符串变量 字符串文件名 = string.empty

然后

private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
  if(string.IsNullOrEmpty(filename)) {
 //Show Save filedialog
    SaveFileDialog save = new SaveFileDialog();

    save.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
    save.Title = "Save File";

    save.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

    if (save.ShowDialog() == DialogResult.OK)
    {
        filename = save.FileName;

    }
   }
   StreamWriter writer = new StreamWriter(filename);
        writer.Write(richTextBox1.Text);
        writer.Close();
}

SaveFileDialog 现在仅在 fileName 为 null 或为空时打开

Answer 3

您必须存储已保存文件的事实，例如通过将文件名存储在您拥有的Form 类的member variable 中。然后使用if 检查您是否已经保存了文件，然后使用ShowDialog() 显示SaveFileDialog（如果您没有）或不继续保存到已经定义的文件名（存储在您的成员变量中）。

试一试，执行以下操作：

• 定义一个string 成员变量，将其命名为_fileName（在你的类中为private string _fileName;）
• 在您的saveToolStripMenuItem_Click 方法中，检查它是否为null (if (null == _fileName))
• 如果是null，像以前一样继续（显示对话框），获取文件名后，将其存储在您的成员变量中
• 重构您的文件编写代码，以便您从文件对话框（如之前）或成员变量_fileName 中获取文件名

玩得开心，C# 是一门很棒的编程语言。

Answer 4

首先，从saveAsToolStripMenuItem_Click 中提取方法：如果您想添加一个弹出菜单、快速按钮，该怎么办？然后就执行

  public partial class Form1: Form {
    // File name to save text to  
    private String m_FileName = "";

    private Boolean SaveText(Boolean showDialog) {
      // If file name is not assigned or dialog explictly required
      if (String.IsNullOrEmpty(m_FileName) || showDialog) {
        // Wrap IDisposable into using
        using (SaveFileDialog dlg = new SaveFileDialog()) {
          dlg.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
          dlg.Title = "Save File";
          dlg.FileName = m_FileName;  

          if (dlg.ShowDialog() != DialogResult.OK) 
            return false;

          m_FileName = dlg.FileName;  
        } 
      }

      File.WriteAllText(m_FileName, richTextBox1.Text);

      this.Text = Path.GetFileNameWithoutExtension(m_FileName);

      return true;
    }

    private void saveAsToolStripMenuItem_Click(object sender, EventArgs e) {
      // SaveAs: always show the dialog 
      SaveText(true);
    }

    private void saveToolStripMenuItem_Click(object sender, EventArgs e) {
      // Save: show the dialog when required only
      SaveText(false);
    }
    ...
  }