WiX: Passing Install path to managed custom action

Question

new Day, new Problem;-) Still got to struggle with managed custom action. I already managed it to call an custom action and passing some test data to it. Now I want to replace the testdata with the real data i need. And here the problems starts: I want to call a batch file which was installed in a subdirectory of my installation. Therefore i need to pass the installation path to the custom action. Afaik this can be done using the customactiondata mechanism. But this does not work. When I log the installation I can see that outside of the customaction INSTALLLOCATION is pointing to the correct path, but as soon as i look in the customaction the customactiondata property is empty...

What am I doing wrong?

Merge Module which calls the custom action:

<Module Id="DflHelpInstaller" Language="1033" Version="1.0.0.0">
    <Package Id="f952de58-1dc6-46b3-872a-7a49e2d9ea0a" Manufacturer="DflHelpInstaller" InstallerVersion="200" />

<Binary Id='RegisterDflHelpDll' SourceFile="$(var.REGISTERHELP.TargetDir)RegisterDflHelp.CA.dll" />

    <CustomAction Id='RegisterDflHelp' BinaryKey='RegisterDflHelpDll'  DllEntry='RegisterDflHelp' Execute='deferred' />

    <CustomAction Id="RegisterDflHelp.SetProperty" Return="check" Property="RegisterDflHelp" Value='[INSTALLLOCATION]' Execute='immediate' />

   
    <InstallExecuteSequence>
      <Custom Action='RegisterDflHelp.SetProperty' After='CostFinalize' />
      <Custom Action='RegisterDflHelp' After='InstallFiles' />
    </InstallExecuteSequence>

    <Directory Id="TARGETDIR" Name="SourceDir">
        </Directory>
    <ComponentGroupRef Id="HelpGroup"/>

    </Module>
</Wix>

Outline of the installer Project which use the MergeModule:

....

<Directory Id="TARGETDIR" Name="SourceDir">
        <Directory Id="ProgramFilesFolder" SourceName="PFFiles">
<Directory Id="Company" Name='$(var.COMPANY)'>
  <Directory Id="INSTALLLOCATION" SourceName='$var.v[SDK_VERSION]'>
    <Component Id="MyBanner" Guid="C8C28B92-9326-4991-BFB1-BBDFDF3653AB">
      <File Id ="Banner.bmp" Source="Banner.bmp" KeyPath="yes" DiskId="1"/>
    </Component>
    <Merge Id ="DflHelpInstaller" SourceFile="DflHelpInstaller.msm" Language="1033" DiskId="1" />
      </Directory>
</Directory>

....

    <Feature Id="Complete" Title="Setup" Description="Installs the SDK on your local machine." Display="expand" Level="1" ConfigurableDirectory="INSTALLLOCATION">
      <ComponentRef Id="Banner" />
      <ComponentRef Id ="UNINSTALLER"/>
      <ComponentGroupRef Id="ReferenceGroup"/>
      <MergeRef Id="DflHelpInstaller"/>
</Feature>

CustomAction:

   public class CustomActions
   { 
        [CustomAction]
        public static ActionResult RegisterDflHelp(Session session)
        {
            session.Log("Begin CustomAction1");
            session.Log("Before Access to customactiondata");
 
            //should contain the installation path - unfortunately it is empty! why?
            string cad = session["CustomActionData"];
            Debugger.Break();


            RegisterHelp(cad);

            session.Log("End of custom action..");
            return ActionResult.Success;
        }

Answer 1

If you delineate your data like ...

<CustomAction Id="MyCustomActionData" Return="check" Property="MyCustomAction" Value='PROPERTY0=[PROPERTY0];PROPERTY1=[PROPERTY1];PROPERTY2=[PROPERTY2]' Execute='immediate' />

You can access the data like:

string property0 = session.CustomActionData["Property0"];
string property1 = session.CustomActionData["Property1"];
string property2 = session.CustomActionData["Property2"];

In the previous example you would use:

<CustomAction Id="RegisterDflHelp.SetProperty" Return="check" Property="RegisterDflHelp" Value='INSTALLLOCATION=[INSTALLLOCATION]' Execute='immediate' />

then

string cad = session.CustomActionData["INSTALLLOCATION"];