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为什么OpenFileDialog会改变我的工作目录？我应该假设System.Windows.Forms中的许多func会改变我的工作目录吗？

    OpenFileDialog open = new OpenFileDialog();
    open.Filter = filter;
    a = Directory.GetCurrentDirectory(); //<-- correct
    if (open.ShowDialog() == DialogResult.OK) //-- select a file on my desktop
    {
        a = Directory.GetCurrentDirectory(); //<-- incorrect, is set to my desktop

基本上,我想知道下面的文件下载问题是否有最好的做法,不仅仅是临时使用,而是最终将它们移动到应用程序文件夹.我面临一些选择:

//Option 1 - Random file
String tempfile = Path.GetTempFileName();
WriteData(tempfile);
File.Move(tempfile, Path.Combine(Environment.CurrentDirectory, filename);

//Option 2 - Temp Path + Random file name
String tempfile = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
WriteData(tempfile);
File.Move(tempfile, Path.Combine(Environment.CurrentDirectory, filename);

//Option 3 - Temp Path + real file name
String tempfile = Path.Combine(Path.GetTempPath(), filename);
WriteData(tempfile);
File.Move(tempfile, Path.Combine(Environment.CurrentDirectory, filename);

//Option 4 - Temp Application Path + Random file name
String tempfile = Path.Combine(Environment.CurrentDirectory, Settings.Default.DownloadFolder, Path.GetRandomFileName());
WriteData(tempfile);
File.Move(tempfile, Path.Combine(Environment.CurrentDirectory, filename);

//Optioin 5 - Temp Application Path + file name
String …