WPF FileDrop事件:只允许特定的文件扩展名

private void Window_Drop(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
    {
        string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
        foreach (string file in files)
        {
            if (Path.GetExtension(file) == ".txt")
            {
                // 处理文件上传逻辑
            }
            else
            {
                MessageBox.Show("只允许上传.txt文件");
            }
        }
    }
}