protected virtual void OnExecuting(ExecutingEventArgs args)
{
var executing = this.Executing;
if (executing != null)
{
executing(this, args);
}
}
protected ExecutionResult Execute(IExecutionContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
//创建“Executing”事件的调用参数
ExecutingEventArgs executingArgs = new ExecutingEventArgs(context);
//激发“Executing”事件
this.OnExecuting(executingArgs);
if (executingArgs.Cancel)
{
return(new ExecutionResult(context));
}
//通过选择器获取当前请求对应的管道集
var pipelines = this.SelectPipelines(context, _pipelines);
//如果当前执行的处理管道数为零则退出
if (pipelines == null || pipelines.Count() < 1)
{
return(null);
}
//调用执行器过滤器的前半截
var stack = ExecutionUtility.InvokeFiltersExecuting(context.Executor.Filters, filter => this.OnFilterExecuting(filter, context));
//执行管道集，并将其执行的最终结果保存到执行器上下文的Result属性中
context.Result = this.InvokePipelines(pipelines, p => this.CreatePipelineContext(context, p, context.Parameter));
//调用执行器过滤器的后半截
ExecutionUtility.InvokeFiltersExecuted(stack, filter => this.OnFilterExecuted(filter, context));
//激发“Executed”事件
this.OnExecuted(new ExecutedEventArgs(context));
return(new ExecutionResult(context));
}