///& lt; Summary> 
The size of the///get a folder 
///& lt;/summary> 
///& lt; Param name="dir" & gt; Folder directory & lt;/param> 
///& lt; Param name="dirSize & gt;" The folder size & lt;/param> 
Public static void GetDirSizeByPath (string dir, ref long dirSize) 
{
Try 
{
DirectoryInfo dirInfo=new DirectoryInfo (dir); 

DirectoryInfo [] dirs=dirInfo. GetDirectories (); 
The FileInfo files []=dirInfo. GetFiles (); 

The foreach (var item in dirs) 
{
GetDirSizeByPath (item. FullName, ref dirSize); 
} 

The foreach (var item in files) 
{
DirSize +=item. Length; 
} 
} 
The catch (Exception ex) 
{
Console. WriteLine (" failed to get the file size "+ ex. Message); 
} 

} 

An example of online, please give an example of using

Folder directory path: UE/UPLOAD