SaveFileDialog问题（C＃）（VS2008）

Question

由于某种原因，我遇到了SaveFileDialog问题。我想要做的就是从文本框中逐行提取数据并将其写入文本文件，然后将该文本文件保存到桌面。第一部分代码工作正常（尽管它不保存到桌面）。代码的第二位是我想要使用的，但是当它创建文本文件时，文本文件是空的。我在第二部分代码中做了什么错误？

此代码有效，但不会保存到桌面，并且不如第二个代码。

//When the Save button is clicked the contents of the text box will be written to a text file. 
private void saveButton_Click(object sender, EventArgs e) 
{ 
    int textBoxLines = textBox.Lines.Count(); 
    if (File.Exists(saveFile)) 
    { 
     result = MessageBox.Show("The file " + saveFile + " already exists.\r\nDo you want to replace it?", "File Already Exists!", MessageBoxButtons.YesNo); 

     if (result == DialogResult.Yes) 
     { 
      TextWriter tw1 = new StreamWriter(saveFile); 
      for (int i = 0; i < textBoxLines; i++) 
      { 
       tw1.WriteLine(textBox.Lines.GetValue(i)); 
      } 

      tw1.Close(); 

     } 

     if (result == DialogResult.No) 
     { 
      MessageBox.Show("Please move or rename existing " + saveFile + "\r\nBefore attempting to save again.", "Message"); 
     } 
    } 

    else 
    { 
     TextWriter tw2 = new StreamWriter(saveFile); 
     for (int i = 0; i < textBoxLines; i++) 
     { 
      tw2.WriteLine(textBox.Lines.GetValue(i)); 
     } 

     tw2.Close(); 

    } 

} 

此代码不能正常工作，但我想用什么。

//When the Save button is clicked the contents of the text box will be written to a text file. 
private void saveButton_Click(object sender, EventArgs e) 
{ 
    int textBoxLines = textBox.Lines.Count(); 

    Stream saveStream; 
    SaveFileDialog saveDialog = new SaveFileDialog(); 
    saveDialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"; 
    saveDialog.FilterIndex = 2; 
    saveDialog.RestoreDirectory = true; 
    saveDialog.FileName = (saveFile); 
    saveDialog.InitialDirectory = (Environment.GetFolderPath(Environment.SpecialFolder.Desktop)); 

    if (saveDialog.ShowDialog() == DialogResult.OK) 
    { 
     if ((saveStream = saveDialog.OpenFile()) != null) 
     { 
      StreamWriter tw = new StreamWriter(saveStream); 
      for (int i = 0; i < textBoxLines; i++) 
      { 
       tw.WriteLine(textBox.Lines.GetValue(i)); 
      } 

      saveStream.Close(); 
     } 
    } 
} 

Answer 1

写的内容后，您有没有一个tw.Close()。缓冲区不会被刷新。

Answer 2

正如ChrisF所说，你永远不会关闭SteamWriter。但是，作为最佳做法，您应该有using块来为您关闭/处置这些块。

//When the Save button is clicked the contents of the text box will be written to a text file. 
private void saveButton_Click(object sender, EventArgs e) 
{ 
    int textBoxLines = textBox.Lines.Count(); 

    SaveFileDialog saveDialog = new SaveFileDialog(); 
    saveDialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"; 
    saveDialog.FilterIndex = 2; 
    saveDialog.RestoreDirectory = true; 
    saveDialog.FileName = (saveFile); 
    saveDialog.InitialDirectory = (Environment.GetFolderPath(Environment.SpecialFolder.Desktop)); 

    if (saveDialog.ShowDialog() == DialogResult.OK) 
    { 
     using (Stream savestream = saveFialog.OpenFile()) 
     { 

      if (saveStream != null) 
      { 
       using(StreamWriter tw = new StreamWriter(saveStream)) 
       { 

        for (int i = 0; i < textBoxLines; i++) 
        { 
         tw.WriteLine(textBox.Lines.GetValue(i)); 
        } 
       } 
      } 
     } 
    } 
}