Let me see if I can help. It looks like you have the following structure:
C:\temp\p\p
and this directory has nothing in it. Does this look correct?
PS C:\Users\micha\testfolder> gci p
Directory: C:\Users\micha\testfolder\p
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 12/18/2020 8:44 AM p
PS C:\Users\micha\testfolder> gci .\p\p
PS C:\Users\micha\testfolder>
Assuming my test environment matches yours, I think I might understand the issue. When you run Get-ChildItem against a directory the default view (text returned to the screen) includes a column heading called “Length” but that property only applies to files and NOT directories, so if the directory you run Get-Childitem against only has directories and no files, that column heading will still be present but no values. To illustrate this I put a simple text file in the .\p directory.
PS C:\Users\micha\testfolder> gci p
Directory: C:\Users\micha\testfolder\p
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 12/18/2020 8:44 AM p
-a---- 12/18/2020 8:46 AM 5 Foo.txt
To further illustrate I’ll pipe the results to Get-Member. Notice there are two object types displayed in this result System.IO.FileInfo and System.IO.DirectoryInfo. The FileInfo object has a length property but the DirectoryInfo object does not.
PS C:\Users\micha\testfolder> gci p | Get-Member
TypeName: System.IO.DirectoryInfo
Name MemberType Definition
---- ---------- ----------
LinkType CodeProperty System.String LinkType{get=GetLinkType;}
Mode CodeProperty System.String Mode{get=Mode;}
Target CodeProperty System.Collections.Generic.IEnumerable`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutr...
Create Method void Create(), void Create(System.Security.AccessControl.DirectorySecurity directorySecurity)
CreateObjRef Method System.Runtime.Remoting.ObjRef CreateObjRef(type requestedType)
CreateSubdirectory Method System.IO.DirectoryInfo CreateSubdirectory(string path), System.IO.DirectoryInfo CreateSubdirecto...
Delete Method void Delete(), void Delete(bool recursive)
EnumerateDirectories Method System.Collections.Generic.IEnumerable[System.IO.DirectoryInfo] EnumerateDirectories(), System.Co...
EnumerateFiles Method System.Collections.Generic.IEnumerable[System.IO.FileInfo] EnumerateFiles(), System.Collections.G...
EnumerateFileSystemInfos Method System.Collections.Generic.IEnumerable[System.IO.FileSystemInfo] EnumerateFileSystemInfos(), Syst...
Equals Method bool Equals(System.Object obj)
GetAccessControl Method System.Security.AccessControl.DirectorySecurity GetAccessControl(), System.Security.AccessControl...
GetDirectories Method System.IO.DirectoryInfo[] GetDirectories(), System.IO.DirectoryInfo[] GetDirectories(string searc...
GetFiles Method System.IO.FileInfo[] GetFiles(string searchPattern), System.IO.FileInfo[] GetFiles(string searchP...
GetFileSystemInfos Method System.IO.FileSystemInfo[] GetFileSystemInfos(string searchPattern), System.IO.FileSystemInfo[] G...
GetHashCode Method int GetHashCode()
GetLifetimeService Method System.Object GetLifetimeService()
GetObjectData Method void GetObjectData(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serializat...
GetType Method type GetType()
InitializeLifetimeService Method System.Object InitializeLifetimeService()
MoveTo Method void MoveTo(string destDirName)
Refresh Method void Refresh()
SetAccessControl Method void SetAccessControl(System.Security.AccessControl.DirectorySecurity directorySecurity)
ToString Method string ToString()
PSChildName NoteProperty string PSChildName=p
PSDrive NoteProperty PSDriveInfo PSDrive=C
PSIsContainer NoteProperty bool PSIsContainer=True
PSParentPath NoteProperty string PSParentPath=Microsoft.PowerShell.Core\FileSystem::C:\Users\micha\testfolder\p
PSPath NoteProperty string PSPath=Microsoft.PowerShell.Core\FileSystem::C:\Users\micha\testfolder\p\p
PSProvider NoteProperty ProviderInfo PSProvider=Microsoft.PowerShell.Core\FileSystem
Attributes Property System.IO.FileAttributes Attributes {get;set;}
CreationTime Property datetime CreationTime {get;set;}
CreationTimeUtc Property datetime CreationTimeUtc {get;set;}
Exists Property bool Exists {get;}
Extension Property string Extension {get;}
FullName Property string FullName {get;}
LastAccessTime Property datetime LastAccessTime {get;set;}
LastAccessTimeUtc Property datetime LastAccessTimeUtc {get;set;}
LastWriteTime Property datetime LastWriteTime {get;set;}
LastWriteTimeUtc Property datetime LastWriteTimeUtc {get;set;}
Name Property string Name {get;}
Parent Property System.IO.DirectoryInfo Parent {get;}
Root Property System.IO.DirectoryInfo Root {get;}
BaseName ScriptProperty System.Object BaseName {get=$this.Name;}
TypeName: System.IO.FileInfo
Name MemberType Definition
---- ---------- ----------
LinkType CodeProperty System.String LinkType{get=GetLinkType;}
Mode CodeProperty System.String Mode{get=Mode;}
Target CodeProperty System.Collections.Generic.IEnumerable`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutr...
AppendText Method System.IO.StreamWriter AppendText()
CopyTo Method System.IO.FileInfo CopyTo(string destFileName), System.IO.FileInfo CopyTo(string destFileName, bo...
Create Method System.IO.FileStream Create()
CreateObjRef Method System.Runtime.Remoting.ObjRef CreateObjRef(type requestedType)
CreateText Method System.IO.StreamWriter CreateText()
Decrypt Method void Decrypt()
Delete Method void Delete()
Encrypt Method void Encrypt()
Equals Method bool Equals(System.Object obj)
GetAccessControl Method System.Security.AccessControl.FileSecurity GetAccessControl(), System.Security.AccessControl.File...
GetHashCode Method int GetHashCode()
GetLifetimeService Method System.Object GetLifetimeService()
GetObjectData Method void GetObjectData(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serializat...
GetType Method type GetType()
InitializeLifetimeService Method System.Object InitializeLifetimeService()
MoveTo Method void MoveTo(string destFileName)
Open Method System.IO.FileStream Open(System.IO.FileMode mode), System.IO.FileStream Open(System.IO.FileMode ...
OpenRead Method System.IO.FileStream OpenRead()
OpenText Method System.IO.StreamReader OpenText()
OpenWrite Method System.IO.FileStream OpenWrite()
Refresh Method void Refresh()
Replace Method System.IO.FileInfo Replace(string destinationFileName, string destinationBackupFileName), System....
SetAccessControl Method void SetAccessControl(System.Security.AccessControl.FileSecurity fileSecurity)
ToString Method string ToString()
PSChildName NoteProperty string PSChildName=Foo.txt
PSDrive NoteProperty PSDriveInfo PSDrive=C
PSIsContainer NoteProperty bool PSIsContainer=False
PSParentPath NoteProperty string PSParentPath=Microsoft.PowerShell.Core\FileSystem::C:\Users\micha\testfolder\p
PSPath NoteProperty string PSPath=Microsoft.PowerShell.Core\FileSystem::C:\Users\micha\testfolder\p\Foo.txt
PSProvider NoteProperty ProviderInfo PSProvider=Microsoft.PowerShell.Core\FileSystem
Attributes Property System.IO.FileAttributes Attributes {get;set;}
CreationTime Property datetime CreationTime {get;set;}
CreationTimeUtc Property datetime CreationTimeUtc {get;set;}
Directory Property System.IO.DirectoryInfo Directory {get;}
DirectoryName Property string DirectoryName {get;}
Exists Property bool Exists {get;}
Extension Property string Extension {get;}
FullName Property string FullName {get;}
IsReadOnly Property bool IsReadOnly {get;set;}
LastAccessTime Property datetime LastAccessTime {get;set;}
LastAccessTimeUtc Property datetime LastAccessTimeUtc {get;set;}
LastWriteTime Property datetime LastWriteTime {get;set;}
LastWriteTimeUtc Property datetime LastWriteTimeUtc {get;set;}
Length Property long Length {get;}
Name Property string Name {get;}
BaseName ScriptProperty System.Object BaseName {get=if ($this.Extension.Length -gt 0){$this.Name.Remove($this.Name.Length...
VersionInfo ScriptProperty System.Object VersionInfo {get=[System.Diagnostics.FileVersionInfo]::GetVersionInfo($this.FullNam...
Note length is the size of the file. If you’d like to view the sum of size of the files contained in a directory, I can help with that, but windows does not calculate a size (length) for a directory. This is a Windows thing NOT a PowerShell thing.
https://docs.microsoft.com/en-us/dotnet/api/system.io.fileinfo.length?view=net-5.0
