Request for the permission of type 'FileIOPermission' failed.

Problem: Generally while working with files we might get the below errors

Request for the permission of type 'FileIOPermission' failed.

(S)\Classes\FileIOPermission\demand
(S)\Classes\WinAPIServer\fileExists- line 11 

or 

Request for the permission of type 'FileIOPermission' failed.

(S)\Classes\FileIOPermission\demand

(S)\Classes\WinAPIServer\deleteFile- line 11 

Solution: 

Set permissionSet;

FileName fileName = ''Test.Xml"; 

permissionSet = new Set(Types::Class);

permissionSet.add(new InteropPermission(InteropKind::ClrInterop));
permissionSet.add(new FileIOPermission(fileName , 'rw'));
CodeAccessPermission::assertMultiple(permissionSet);

 if (WINAPIServer::fileExists(fileName))

    {

        if (Box::yesNo(strfmt("Do you want to re-write the file", filename), DialogButton::No))

        {

            WINAPIServer::deleteFile(filename);

         }

        else

        {

            return;

        }

    }

CodeAccessPermission::revertAssert();

A copy will also require FileIOPermission of 'r' on the source file.  A Move will require a permission of 'w' on the source.

Microsoft.Dynamics.Ax.Xpp.InvalidRemoteCallException’ was thrown

Problem: While working on Files using WinAPI got the below error.

Microsoft.Dynamics.Ax.Xpp.InvalidRemoteCallException’ was thrown

Solution:

Change WinAPI to WinAPIServer

Example:

WINAPI::fileExists(fileName) to WINAPIServer::fileExists(fileName)

WINAPI::deleteFile(filename) to WINAPIServer::deleteFile(filename)