C# implementation of PSCCMClient as a library with dual .NET Framework 4.8 and .NET Core 8.0 support, comprehensive interfaces, unit testing framework, universal credential authentication, and remote COM execution capability

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This PR implements a comprehensive refactoring of the CCM service architecture by introducing abstract base classes, fixing critical model property mismatches with the PowerShell module, adding dual compilation support for both .NET Framework 4.8 and .NET Core 8.0, establishing a professional testing framework with service interfaces for dependency injection, resolving registry service issues, and implementing universal credential authentication with remote COM execution capabilities across all services.

Universal Credential Authentication Support

Added comprehensive credential support for remote machine authentication across all 12 CCM services:

• Universal credential constructors: All services now support new CCMService("server", "username", securePassword, "domain")
• CCMClient credential support: Main client class accepts credentials and passes them to all underlying services
• Secure credential handling: Uses SecureString for passwords with automatic local vs remote authentication detection
• Consistent authentication: Optional username, password, and domain parameters for all WMI operations

// Local operations (no credentials needed)
var localClient = new CCMClient(".");

// Remote operations with credentials for ALL services
var securePassword = new SecureString();
// ... populate securePassword
var remoteClient = new CCMClient("remote-server", "domain\\username", securePassword, "domain");

// All services automatically use provided credentials
var apps = remoteClient.Applications.GetApplications();
var site = remoteClient.Site.GetSite();
var cache = remoteClient.Cache.GetCacheInfo();

Enhanced Remote COM Execution Capability

Implemented robust COM method execution for both local and remote scenarios with improved result capture:

• Local operations: Direct COM object invocation using Microsoft.SMS.Client
• Remote operations: Enhanced PowerShell script execution via Win32_Process.Create with proper process monitoring
• Improved result capture: Process ID tracking, completion waiting, and reliable temp file handling
• Automatic detection: Seamless selection between local and remote execution methods
• Fixed COM methods: All methods match PowerShell module exactly (SetManagementPoint, SetSite, GetDNSSuffix, TestIsClientOnInternet, TestIsClientAlwaysOnInternet)

Abstract Base Class Implementation

• CCMServiceBase: Abstract base class providing common functionality for all CCM services with universal credential support
• WMIHelper: Centralized WMI operations with consistent local vs remote detection and credential authentication
• COMHelper: Safe COM object operations (local machine only) with proper resource management
• RemoteCOMHelper: Enhanced remote COM execution via PowerShell scripts with improved process monitoring and result capture
• RegistryHelper: Registry operations via WMI StdRegProv with proper type detection

Eliminated Code Duplication Across All Services

Before: Each service duplicated constructor patterns, local vs remote detection logic, WMI namespace path construction, exception handling patterns, and direct ManagementObjectSearcher usage patterns.

After: All 12 services inherit common functionality from CCMServiceBase with standardized patterns for WMI operations, method invocation, namespace handling, error reporting, COM operations, and universal credential management.

Fixed Critical Model Property Mismatches

• CCMMaintenanceWindow: Now returns TimeZone, StartTime (UTC), EndTime (UTC), Duration (seconds), DurationDescription, MWID, Type
• CCMServiceWindow: Now returns Schedules, ServiceWindowID, ServiceWindowType
• CCMCacheContent: Fixed property mappings for ContentSize, ContentComplete, CacheElementId, ContentVersion, LastReferenceTime
• CCMApplication: Expanded from 9 basic properties to 27 comprehensive properties matching PowerShell output
• CCMLoggingConfiguration: Fixed to use correct namespace root\ccm\policy\machine\actualconfig and registry operations matching PowerShell module

Fixed CCM Application Install/Uninstall Implementation

Updated method signatures to require applicationId, revision, and isMachineTarget parameters with missing parameters EnforcePreference, Priority, IsRebootIfNeeded and correct defaults. Fixed parameter types with EnforcePreference as uint matching PowerShell's enum mapping. Added complete UninstallApplication method implementation and convenience overloads that accept CCMApplication objects.

Registry Service Fix

Problem: The CCMRegistryService was directly calling GetStringValue without checking if properties exist or what type they are, causing it to return null for non-string registry values.

Solution: Updated the registry implementation to match the PowerShell module:

• First enumerates values using EnumValues to get property names and types
• Then calls appropriate method (GetStringValue, GetDWORDValue, GetQWORDValue, etc.) based on actual registry type
• Added support for all registry value types including String (REG_SZ), DWORD (REG_DWORD), QWORD (REG_QWORD), MultiString (REG_MULTI_SZ), and Binary (REG_BINARY)
• Updated CCMRegistryProperty.Value from string to object to handle different data types

Service Interfaces for Dependency Injection and Testing

Created comprehensive interfaces for all 12 CCM services (ICCMApplicationService, ICCMClientActionService, etc.) with all services implementing their respective interfaces enabling dependency injection. Clear service contracts improve API consistency and enable better testing patterns supporting both synchronous and asynchronous method patterns.

Comprehensive Unit Testing Framework

58 unit tests covering interface compliance, method contracts, and behavior validation using xUnit test project with Moq and FluentAssertions for professional assertions. Test data helpers provide reusable mock objects for consistent testing scenarios, validating service instantiation, interface implementation, method signatures, and demonstrating proper exception handling and parameter validation.

Dual Framework Compilation Support

Project now targets both net8.0 and net48 for maximum compatibility with framework-specific configurations, ImplicitUsings and nullable reference types. Language version C# 8.0 for .NET Framework 4.8 supports modern syntax while maintaining compatibility. Includes compatibility fixes for range operators, switch expressions, using statements, and fixed .NET Framework package compatibility by removing Microsoft.Management.Infrastructure dependency.

Usage Examples

// Local operations (no credentials needed)
var localClient = new CCMClient(".");
var site = localClient.Site.GetSite();

// Remote operations with credentials - ALL services support this
var securePassword = new SecureString();
// ... populate securePassword
var remoteClient = new CCMClient("remote-server", "domain\\username", securePassword, "domain");

// COM methods work seamlessly for both local and remote with improved execution
bool isOnInternet = remoteClient.Site.TestIsClientOnInternet(); // Uses COM locally, enhanced PowerShell remotely
bool success = remoteClient.Site.SetManagementPoint("newmp.domain.com"); // Automatic execution method with better result capture

// All services now support credentials
var remoteApps = remoteClient.Applications.GetApplications(); // Uses provided credentials
var remoteCache = remoteClient.Cache.GetCacheInfo(); // Uses provided credentials
var remoteRegistry = remoteClient.Registry.GetRegistryProperty("HKLM", "Software\\Microsoft\\SMS\\Client", "AssignedSiteCode"); // Uses provided credentials

The refactored architecture maintains full backward compatibility while providing universal credential authentication across all services, enhanced remote COM execution with proper result capture, and a solid foundation for future enhancements with professional testing practices. The addition of interfaces enables dependency injection patterns and significantly improves testability for enterprise applications. The COM execution capability now works exactly like the PowerShell module for both local and remote operations with improved reliability and result handling.

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