4.6 KiB
Frequently Asked Questions
Where can I learn PowerShell's syntax?
What are the best practices and styles?
The PoshCode unofficial guide is our reference.
What are PowerShell's scoping rules?
- Variables are created in your current scope unless explicitly indicated.
- Variables are visible in a child scope unless explicitly indicated.
- Variables created in a child scope are not visible to a parent unless explicitly indicated.
- Variables may be placed explicitly in a scope.
Things that create a scope
Things that operate in the current scope
- about Operators - Dot source operator (
. { }) - about Language Keywords (
if .. else,for,switch, etc.)
Why didn't an error throw an exception?
Error handling in PowerShell is unique, as not all errors result in catchable exceptions by default.
Setting $ErrorActionPreference = 'Stop' will likely do what you want; that is, cause
non-terminating errors instead of terminating. Read the GitHub issue for more information.
Where do I get the PowerShell Core SDK package?
The SDK NuGet package Microsoft.PowerShell.SDK is provided for developers to write C# code targeting PowerShell. PowerShell NuGet packages are published to Microsoft.PowerShell.SDK on NuGet.org.
To use the Microsoft.PowerShell.SDK NuGet package, declare PackageReference tags in your
.csproj file as follows:
<ItemGroup>
<PackageReference Include="Microsoft.PowerShell.SDK" Version="7.3.5" />
<PackageReference Include="Microsoft.PowerShell.Commands.Diagnostics" Version="7.3.5" />
<PackageReference Include="Microsoft.WSMan.Management" Version="7.3.5"/>
</ItemGroup>
Why did my build fail?
There are few common issues with the build. The easiest way to resolve most issues with the build is
to run Start-PSBuild -Clean.
Dependency changed
If package dependencies were changed in any project.json, you need to manually run
dotnet restore to update your local dependency graphs. Start-PSBuild -Restore can automatically
do this.
Resource changed
Start-PSBuild automatically calls Start-ResGen on the very first run. On subsequent runs, you
may need to explicitly use Start-PSBuild -ResGen command.
Try it, when you see compilation error about *strings.
More details about resource.
TypeGen
Similar to -ResGen parameter, there is -TypeGen parameter that triggers regeneration of type
catalog.
Why did Start-PSBuild tell me to update dotnet?
We depend on the latest version of the .NET CLI, as we use the output of dotnet --info to
determine the current runtime identifier. Without this information, our build function can't know
where dotnet is going to place the build artifacts.
You can automatically install this using Start-PSBootstrap.
However, you must first manually uninstall other versions of the CLI.
If you have installed by using any of the following means:
MSIexeapt-getpkg
You must manually uninstall it.
Additionally, if you've just unzipped their binary drops (or used their obtain scripts, which do essentially the same thing), you must manually delete the folder, as the .NET CLI team re-engineered how their binaries are setup, such that new packages' binaries get stomped on by old packages' binaries.