我有一个正在处理的 Windows 窗体项目。我有一个带有保存和退出选项的菜单条。
第一次执行任一操作时，文件将被保存。用户会看到一个对话框，然后他们选择文件名和路径，这样可以节省很多。
但是对于额外的保存，由于文件已经存在，因此假设覆盖该文件，而是追加到末尾。因此，从本质上讲，它会将相同的信息两次输出到文件中。
这是保存和关闭的事件处理程序：
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
saveCurrentFile("save");
}
private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
saveCurrentFile("exit");
this.Close();
}
以下是保存方法：
private void saveCurrentFile(string sender)
{
// Check who called this method for the first time, if it was the save menu option, no need to ask if they want to
// save, just show the user the prompt
// If it was the exit menu option, ask user if they want to save
if (sender.CompareTo("save") == 0)
{
if (fileName == "")
{
saveFileDialog1.ShowDialog();
fileName = saveFileDialog1.FileName;
}
}
else if (sender.CompareTo("exit") == 0)
{
// Display a messagebox to ask user if they want to save
DialogResult dResult = new DialogResult();
dResult = MessageBox.Show("Would you like to save?", "Save", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
// Check what button the user pressed
if (dResult == DialogResult.Yes)
{
if (fileName == "")
{
saveFileDialog1.ShowDialog();
fileName = saveFileDialog1.FileName;
}
}
}
// Now check if the fileName is empty
if (fileName != "")
{
DateTime date = DateTime.Now;
// Add some header information to the string builder
sb.AppendLine("Budget Information");
sb.Append("Date & Time File Saved: ");
sb.AppendLine(date.ToString());
sb.Append("\r\n");
sb.Append("\r\n");
// Add the income data to the string builder
sb.AppendLine("Hourly Wage: " + hourlyUpDown.Value.ToString("C"));
sb.AppendLine("Annual Salary: " + annualUpDown.Value.ToString("C"));
sb.AppendLine("Tax: " + taxUpDown.Value.ToString());
sb.AppendLine("Hours Per Week: " + hoursPerWeekUpDown.Value.ToString());
sb.AppendLine("Weeks Per Year: " + weeksPerYearUpDown.Value.ToString());
sb.AppendLine("Net Weekly Income: " + netWeeklyIncome.ToString("C"));
sb.AppendLine("Net Monthly Income: " + netMonthlyIncome.ToString("C"));
sb.AppendLine("Net Annual Income: " + netAnnualIncome.ToString("C"));
// Add the expenses table to the string builder
foreach (KeyValuePair<TextBox, TextBox> entry in expenses)
{
sb.AppendLine(entry.Key.Text + " " + entry.Value.Text);
}
// Add a note to the user about modifying the file by hand
sb.Append("\r\n");
sb.Append("\r\n");
sb.AppendLine("This file is created in a specific format.");
sb.AppendLine("Any modifications to it may cause errors when the program tries to open and read the file contents.");
sb.AppendLine("Any changes made by hand must conserve the formatting");
using (StreamWriter outfile = new StreamWriter(fileName, false))
{
outfile.Write(sb.ToString());
outfile.Flush();
outfile.Close();
}
}
}
我不确定为什么文件要写两次。我添加了outfile.Flush()andoutfile.Close()来尝试解决问题，但这没有用。
任何帮助都会很棒。
编辑：我更新了代码以仅使用一种方法进行保存。这个错误比我最初想象的要复杂一些。
每次用户去保存文件时，输出都会附加到文件中。因此，如果用户通过转到菜单-> 保存来保存文件，则输出将写入文件。对于每个后续保存，附加输出。
不知道出了什么问题，我正在使用流写入器的布尔附加参数，刷新和关闭。