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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

After using the OpenFileDialog for selecting a file the Environment.CurrentDirectory changes to the folder of the file. Is this normal?

From my understanding Environment.CurrentDirectory should always be the application folder.