SaveFileDialog問題（C＃）（VS2008）

Question

由於某種原因，我在SaveFileDialog上遇到問題。 我要做的就是逐行從文本框中提取數據並將其寫入文本文件，然后將該文本文件保存到桌面。 第一部分代碼可以正常工作（盡管它不會保存到桌面上）。 代碼的第二位是我要使用的代碼，但是當它創建文本文件時，該文本文件為空。 我在第二段代碼中做錯了什么？

該代碼可以工作，但是不能保存到桌面，並且不如第二個代碼好。

//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();

    }

}

此代碼不起作用，但這是我要使用的代碼。

//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

編寫內容后，您還沒有tw.Close() 。 緩沖區將不會被刷新。

Answer 2

正如ChrisF所指出的，您永遠不會關閉SteamWriter。 但是，作為最佳實踐，您應該using塊為您關閉/處置這些塊。

//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));
                    }
                }
            }
        }
    }
}