How to Use CustomAction in Bootstrapper ExePackage DetectCondition to realize net core installed or not - wix

Question

I am trying to use customAction method in a Bootstrapper project to determined specific version of .net core is installed or not, but it not work
here is my wsx file code
<Fragment>
<WixVariable Id="TargetFileName" Value="[WixBundleSourceProcessPath]" Overridable="yes" />
<Binary Id="CustomAction.dll" SourceFile="$(var.CustomAction.TargetDir)CustomAction.CA.dll" />
<CustomAction Id="CheckASPNETCore" Return="check" Execute="immediate" Impersonate="no" BinaryKey=".CustomAction.dll" DllEntry="TestMethod" />
<WixVariable Id="ASPDOTNETCORE60" Value="[ASPDOTNETCORE60]" Overridable="yes" />
<PackageGroup Id="NetRuntime6Web">
<ExePackage
Name="dotnet-hosting-6.0.8-win.exe"
InstallCommand="/install /quiet /norestart /log "[AspNetCoreRuntime6Log]""
RepairCommand="/repair /quiet /norestart /log "[AspNetCoreRuntime6Log]""
UninstallCommand="/uninstall /quiet /norestart /log "[AspNetCoreRuntime6Log]""
PerMachine="yes"
DetectCondition="[ASPDOTNETCORE60] = 1"
Vital="yes"
Permanent="yes"
Protocol="burn"
DownloadUrl="https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-aspnetcore-6.0.8-windows-hosting-bundle-installer"
LogPathVariable="AspNetCoreRuntime6Log"
SourceFile="C:\Net\dotnet-hosting-6.0.8-win.exe"
Compressed="yes">
</ExePackage>
</PackageGroup>
</Fragment>
[CustomAction]
public static ActionResult TestMethod(Session session)
{
session.Log($"Test Method Run");
session["ASPDOTNETCORE60"] = "1";
return ActionResult.Success;
}
and here is my customAction
and this is the error I'm getting where run exe file
[26A0:E8C4][2022-12-01T12:17:46]e000: Error 0x8007000d: Failed to parse condition "[ASPDOTNETCORE60] = 1". Unexpected character at position 0.
how can I use that customAction ???

Answer 1

Each version of the .NET Runtime will create a directory in Program Files\dotnet\shared\Microsoft.NETCore.App\
The existance of the directory Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.5 confirms the existance of .NET Runtime version 6.0.5. Using this knowledge, you can do a simple DirectorySearch in Wix to check whether a specific version of the runtime is installed like so:
<!-- Check if NET 6.0 Runtime already installed -->
<util:DirectorySearch
Path="[ProgramFiles6432Folder]dotnet\shared\Microsoft.NETCore.App\6.0.5"
Result="exists"
Variable="Net6RuntimeExists"/>
Here's the (almost) full file for clarity:
<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
xmlns:bal="http://schemas.microsoft.com/wix/BalExtension"
xmlns:util="http://schemas.microsoft.com/wix/UtilExtension">
<Bundle ...>
... code removed for brevity
<!-- Check if NET 6.0 Runtime already installed -->
<util:DirectorySearch
Path="[ProgramFiles6432Folder]dotnet\shared\Microsoft.NETCore.App\6.0.5"
Result="exists"
Variable="Net6RuntimeExists" />
<Chain>
<!--This will only be installed when the .NET 6 Runtime is not already installed-->
<ExePackage
Id="TheNet6Runtime"
DisplayName=".NET 6 Desktop Runtime"
Vital="no"
Cache="no"
Permanent="yes"
InstallCommand="/install /quiet /norestart"
SourceFile="windowsdesktop-runtime-6.0.5-win-x64.exe"
DetectCondition="Net6RuntimeExists" />
... code removed for brevity
</Chain>
</Bundle>
</Wix>