How to show filesystem(filenames from a folder) in SSRS

Question

Hallo everyone,
I haved already tried the following solutions
http://forums.asp.net/t/1422162.aspx?System+Security+SecurityException+Request+for+the+permission+of+type+System+Security+Permissions+FileIOPermission+mscorlib+Version+2+0+0+0+Culture+neutral+PublicKeyToken+b77a5c561934e089+failed+
AND
http://stackoverflow.com/questions/8476231/ssrs-custom-code
Both didn't work.
My problem is:
What I want is to show all filenames from a certain folder in SSRS.
I started with custom code in SSRS:
Public Function getArrayOfFilename(pathname As String) as Array
Dim arrayOfFilename As String() = System.IO.Directory.GetFiles(pathname)
System.Array.Sort(Of String)(arrayOfFilename)
Return arrayOfFilename
End Function
My questions are:
1. If I try to call this function in a textbox like this:
getArrayOfFilename("C:\Help\")
then I get this error:
[rsRuntimeErrorInExpression] The Value expression for the textrun ‘Textbox8.Paragraphs[0].TextRuns[0]’ contains an error: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
2. Can I use this array as a dataset to carete a list or table  in SSRS?
Thanks for any hint!

Answer 1

The error message is related to permission. You are trying to access the file system object of the reporting server.
Moreover creating a dataset from a custom code can be challenge, instead we can simply use TSQL to do this.
----------------- RUN TO ENABLE COMMAND SHELL
EXEC sp_configure 'xp_cmdshell', 1;
GO
-- To update the currently configured value for this feature.
RECONFIGURE;
----------------------QUERY
DECLARE @folder VARCHAR(100) = 'C:\TESTING'
DECLARE @DOSCommand varchar(1024); SET @DOSCommand =  'dir ' + @folder +'\'  + ' /A-D  /B'
EXEC MASTER.dbo.xp_cmdshell @DOSCommand
Regards, RSingh