docs: explain how to access static members of types loaded in AssemblyLoadContext

[Copilot]

• Add a "Access static members" section to understanding-assemblyloadcontext.md explaining how to use reflection to access static properties and methods of types loaded in an AssemblyLoadContext
• Update ms.date and add ai-usage: ai-assisted to frontmatter
• Fix accessor method description: use term "accessor methods" (not "backing methods"), note GetMethod(string) only finds public methods, and show BindingFlags overload for non-public accessors like the private set
• Use a fully qualified type name ("MyPlugin.Paths") in the GetType example to clarify that most real assemblies have namespaced types; bare names like "Paths" only work for global-namespace types

Original prompt

---

This section details on the original issue you should resolve

<issue_title>How do you access static members in an AssemblyLoadContext</issue_title>
<issue_description>Example:
public static class Paths
{
public static DirectoryInfo RootIO { get; private set; }
}

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 6c83628c-7002-9045-9c72-f8d97b784eb0
• Version Independent ID: a761a83d-5aa8-958a-d210-6eb8f7929ff2
• Content: Understanding AssemblyLoadContext - .NET Core
• Content Source: docs/core/dependency-loading/understanding-assemblyloadcontext.md
• Product: dotnet-core
• GitHub Login: @sdmaclea
• Microsoft Alias: stmaclea</issue_description>

Comments on the Issue (you are @copilot in this section)

@vitek-karas It's actually `get_RootIO` and `set_RootIO`. So basically calling `Type.GetMethod("get_RootIO")` will get you the "getter" which you can invoke. Or use the `PropertyInfo` which has shortcuts for this as well. @gewarren Should we add this info to the article?

• Fixes How do you access static members in an AssemblyLoadContext #18298

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Internal previews

📄 File	🔗 Preview link
docs/core/dependency-loading/understanding-assemblyloadcontext.md	docs/core/dependency-loading/understanding-assemblyloadcontext

[BillWagner]

This LGTM and is ready for final review.

[Copilot]

Pull request overview

Adds documentation to clarify how to access static members on types loaded into a custom AssemblyLoadContext, focusing on reflection-based access patterns and linking back to existing type-isolation guidance.

Changes:

• Updates frontmatter metadata (ms.date) and adds AI usage disclosure.
• Adds a new Access static members section explaining reflection approaches for static properties, fields, and methods.
• Adds a note cross-linking to the existing Type-conversion issues section.