Remove unnecessary Array -> List -> Array conversion in ProcessBaseCommand.AllProcesses (PowerShell#15052)

Author: xtqqczze

src/Microsoft.PowerShell.Commands.Management/commands/management/Process.cs

@@ -266,30 +266,17 @@ private void RetrieveProcessesByInput()
         }
 
         /// <summary>
-        /// Retrieve the master list of all processes.
+        /// Gets an array of all processes.
         /// </summary>
-        /// <value></value>
+        /// <value>An array of <see cref="Process"/> components that represents all the process resources.</value>
         /// <exception cref="System.Security.SecurityException">
         /// MSDN does not document the list of exceptions,
         /// but it is reasonable to expect that SecurityException is
         /// among them.  Errors here will terminate the cmdlet.
         /// </exception>
-        internal Process[] AllProcesses
-        {
-            get
-            {
-                if (_allProcesses == null)
-                {
-                    List<Process> processes = new();
-                    processes.AddRange(Process.GetProcesses());
-                    _allProcesses = processes.ToArray();
-                }
-
-                return _allProcesses;
-            }
-        }
+        internal Process[] AllProcesses => _allProcesses ??= Process.GetProcesses();
 
-        private Process[] _allProcesses = null;
+        private Process[] _allProcesses;
 
         /// <summary>
         /// Add <paramref name="process"/> to <see cref="_matchingProcesses"/>,