C# WPF FileSaving 遇到异常

Question

我的问题是，我不断看到一个反复出现的主题，试图让我的记事本克隆保存文件。每当我尝试保存文件时，无论硬盘上的位置如何，都会继续抛出 UnauthorizedAccess 异常。下面是我所做的示例代码，自昨晚以来我一直在尝试对此进行研究，但无济于事。任何帮助将不胜感激。

//located at base class level
private const string fileFilter = "Text Files|*.txt|All Files|*.*";

private string currentPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

private void MenuFileSaveAs_Click(object sender, RoutedEventArgs e)
{
    SaveFileDialog sfd = new SaveFileDialog();
    sfd.DefaultExt = "*.txt";
    sfd.Filter = fileFilter;
    sfd.AddExtension = true;
    sfd.InitialDirectory = currentPath;
    sfd.RestoreDirectory = true;
    sfd.OverwritePrompt = true;
    sfd.ShowDialog();

    try
    {
        System.IO.File.WriteAllText(currentPath,TxtBox.Text,Encoding.UTF8);     
    }

    catch (ArgumentException)
    {
        // Do nothing
    }    

    catch(UnauthorizedAccessException)
    {
        MessageBox.Show("Access Denied");
    }
}

Answer 1

更改以下行。

...
    if (sfd.ShowDialog() != true)
        return;

    try
    {
        using (var stream = sfd.OpenFile())
        using (var writer = new StreamWriter(stream, Encoding.UTF8))
        {
            writer.Write(TxtBox.Text);
        }
    }
...

希望对你有帮助。