protected virtual object Execute(TContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
//创建事件参数对象
var executingArgs = new CommandExecutorExecutingEventArgs(context);
//激发“Executing”事件
this.OnExecuting(executingArgs);
if (executingArgs.Cancel)
{
return(executingArgs.Result);
}
//执行命令
this.OnExecute(context);
//创建事件参数对象
var executedArgs = new CommandExecutorExecutedEventArgs(context);
//激发“Executed”事件
this.OnExecuted(executedArgs);
//返回最终的执行结果
return(context.Result);
}
protected virtual void OnExecuting(CommandExecutorExecutingEventArgs args)
{
var executing = this.Executing;
if (executing != null)
{
executing(this, args);
}
}