https://*.com/questions/7672774/how-do-i-determine-the-windows-download-folder-path
如果你通过文件夹的location属性，移动了文件夹。
比如之前在%userProfile%\downloads，被移动到了c:\workspace\clu\downloads
You can use the Windows API Code Pack for Microsoft .NET Framework.
Reference: Microsoft.WindowsAPICodePack.Shell.dll
Need the following namespace:
using Microsoft.WindowsAPICodePack.Shell;Simple usage:
string downloadsPath = KnownFolders.Downloads.Path;