Switch config dictionaries to ConcurrentDictionary

Replaced Dictionary with ConcurrentDictionary for Configurations and Validation in ConfigurationHost to improve thread safety. Updated related code in SetDbatoolsConfigCommand and WriteMessageCommand to use TryGetValue for safer concurrent access. Bumped module and assembly versions to reflect these changes.

Author: potatoqualitee

dbatools.library.psd1

@@ -7,7 +7,7 @@
 #
 @{
     # Version number of this module.
-    ModuleVersion          = '2025.8.17'
+    ModuleVersion          = '2025.11.2'
 
     # ID used to uniquely identify this module
     GUID                   = '00b61a37-6c36-40d8-8865-ac0180288c84'

project/dbatools/Commands/SetDbatoolsConfigCommand.cs

@@ -258,9 +258,7 @@ protected override void BeginProcessing()
             }
             #endregion Name Interpretation
 
-            _Exists = ConfigurationHost.Configurations.ContainsKey(_NameFull);
-            if (_Exists)
-                _Config = ConfigurationHost.Configurations[_NameFull];
+            _Exists = ConfigurationHost.Configurations.TryGetValue(_NameFull, out _Config);
             _Initialize = Initialize;
             _Persisted = !String.IsNullOrEmpty(PersistedValue);
             _PolicyEnforced = (_Exists && _Config.PolicyEnforced);

project/dbatools/Commands/WriteMessageCommand.cs

@@ -420,7 +420,7 @@ whether this function was called from Stop-Function.
                     if (!String.IsNullOrEmpty(Once))
                     {
                         string onceName = String.Format("MessageOnce.{0}.{1}", FunctionName, Once).ToLower();
-                        if (!(Configuration.ConfigurationHost.Configurations.ContainsKey(onceName) && (bool)Configuration.ConfigurationHost.Configurations[onceName].Value))
+                        if (!(Configuration.ConfigurationHost.Configurations.TryGetValue(onceName, out var existingConfig) && (bool)existingConfig.Value))
                         {
                             WriteWarning(_MessageStreams);
                             channels = channels | LogEntryType.Warning;
@@ -454,7 +454,7 @@ whether this function was called from Stop-Function.
                     if (!String.IsNullOrEmpty(Once))
                     {
                         string onceName = String.Format("MessageOnce.{0}.{1}", FunctionName, Once).ToLower();
-                        if (!(Configuration.ConfigurationHost.Configurations.ContainsKey(onceName) && (bool)Configuration.ConfigurationHost.Configurations[onceName].Value))
+                        if (!(Configuration.ConfigurationHost.Configurations.TryGetValue(onceName, out var existingConfig) && (bool)existingConfig.Value))
                         {
                             InvokeCommand.InvokeScript(false, ScriptBlock.Create(_writeHostScript), null, _MessageHost);
                             channels = channels | LogEntryType.Information;

project/dbatools/Configuration/ConfigurationHost.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Management.Automation;
 
@@ -13,12 +14,12 @@ public static class ConfigurationHost
         /// <summary>
         /// Hashtable containing all the configuration entries
         /// </summary>
-        public static Dictionary<string, Config> Configurations = new Dictionary<string, Config>(StringComparer.InvariantCultureIgnoreCase);
+        public static ConcurrentDictionary<string, Config> Configurations = new ConcurrentDictionary<string, Config>(StringComparer.InvariantCultureIgnoreCase);
 
         /// <summary>
         /// Hashtable containing all the registered validations
         /// </summary>
-        public static Dictionary<string, string> Validation = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase);
+        public static ConcurrentDictionary<string, string> Validation = new ConcurrentDictionary<string, string>(StringComparer.InvariantCultureIgnoreCase);
 
         /// <summary>
         /// Whether the import from registry has been completed. Prevents multiple imports and overwrites when importing the module multiple times.

project/dbatools/dbatools.csproj

@@ -7,8 +7,8 @@
     <Product>dbatools</Product>
     <Description>The dbatools PowerShell Module library</Description>
     <Copyright>Copyright ©  2023</Copyright>
-    <AssemblyVersion>0.10.0.76</AssemblyVersion>
-    <FileVersion>0.10.0.76</FileVersion>
+    <AssemblyVersion>0.10.0.77</AssemblyVersion>
+    <FileVersion>0.10.0.77</FileVersion>
     <AssemblyName>dbatools</AssemblyName>
     <SkipFunctionsDepsCopy>false</SkipFunctionsDepsCopy>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>