今天被Prism里面的一段代码雷到了

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public virtual bool CanExecute(object parameter) {     bool hasEnabledCommandsThatShouldBeExecuted = false;       ICommand[] commandList;     lock (this.registeredCommands)     {         commandList = this.registeredCommands.ToArray();     }     foreach (ICommand command in commandList)     {         if (this.ShouldExecute(command))         {             if (!command.CanExecute(parameter))             {                 return false;             }               hasEnabledCommandsThatShouldBeExecuted = true;         }     }       return hasEnabledCommandsThatShouldBeExecuted; }