IWebEventCustomEvaluator 介面

定義

命名空間:

System.Web.Management

組件:

System.Web.dll

評估事件是否要傳送給相關的提供者以進行處理。

C#

public interface IWebEventCustomEvaluator

範例

下列程式碼範例示範如何在建立自訂事件時衍生自 IWebEventCustomEvaluator 介面。

C#

using System;
using System.Text;
using System.Web;
using System.Web.Management;

namespace SamplesAspNet
{
  // Implements a custom WebBaseEvent class. 
    public class SampleWebBaseEvent :
        System.Web.Management.WebBaseEvent, IWebEventCustomEvaluator
    {
        private string customCreatedMsg, customRaisedMsg;

        // Store firing record info.
        private static string firingRecordInfo;

        // Implements the IWebEventCustomEvaluator.CanFire 
        // method. It is called by the ASP.NET if this custom
        // type is configured in the profile
        // element of the healthMonitoring section.
        public bool CanFire(
            System.Web.Management.WebBaseEvent e, 
            RuleFiringRecord rule)
        {

            bool fireEvent;
            string lastFired = rule.LastFired.ToString();
            string timesRaised = rule.TimesRaised.ToString();

            // Fire every other event raised.
            fireEvent =
                (rule.TimesRaised % 2 == 0) ? true : false;

            if (fireEvent)
            {
                firingRecordInfo =
                    string.Format("Event last fired: {0}",
                    lastFired) +
                    string.Format(". Times raised: {0}",
                    timesRaised);
            }
            else
                firingRecordInfo =
                  string.Format(
                   "Event not fired. Times raised: {0}",
                   timesRaised);

            return fireEvent;
        }

        // Invoked in case of events identified only by 
        // their event code.
        public SampleWebBaseEvent(string msg, 
            object eventSource, int eventCode):
          base(msg, eventSource, eventCode)
        {
            // Perform custom initialization.
            customCreatedMsg =
            string.Format("Event created at: {0}",
            EventTime.ToString());
        }

        // Invoked in case of events identified by their 
        // event code.and related event detailed code.
        public SampleWebBaseEvent(string msg, object eventSource, 
            int eventCode, int eventDetailCode):
          base(msg, eventSource, eventCode, eventDetailCode)
        {
            // Perform custom initialization.
            customCreatedMsg =
             string.Format("Event created at: {0}",
             EventTime.ToString());
        }


        // Raises the SampleWebBaseEvent.
        public override void Raise()
        {
            // Perform custom processing. 
            customRaisedMsg =
              string.Format("Event raised at: {0}",
              EventTime.ToString());

            // Raise the event.
            base.Raise();
        }


        // Raises the SampleWebBaseEvent.
        public void CustomRaise(
            System.Web.Management.WebBaseEvent evnt)
        {
            
            // Raise the event.
            Raise(evnt);
        }


        // Gets the event code.
        public int GetEventCode(bool detail)
        {
            int eCode;

            if (!detail)
                // Get the event code.
                eCode = EventCode;

            else
                // Get the detail event code.
                eCode = EventDetailCode;

            return eCode;
        }

        // Gets the event sequence.
        public long GetEventSequence()
        {
            // Get the event sequence.
            long eventSequence = EventSequence;
            return eventSequence;
        }

        // Gets the event source.
        public Object GetEventSource()
        {
            // Get the event source.
            Object source = this.EventSource;
            return source;
        }

        // Gets the event time.
        public DateTime GetEventTime()
        {
            // Get the event source.
            DateTime eTime = EventTime;
            return eTime;
        }

        // Gets the event time.
        public DateTime GetEventTimeUtc()
        {
            // Get the event source.
            DateTime eTime = EventTimeUtc;
            return eTime;
        }

        // Gets the event sequence.
        public string GetEventMessage()
        {
            // Get the event message.
            string eventMsg = Message;
            return eventMsg;
        }

        // Gets the current application information.
        public WebApplicationInformation GetEventAppInfo()
        {
            // Get the event message.
            WebApplicationInformation appImfo = 
                ApplicationInformation;
            return appImfo;
        }

        // Implements the ToString() method.
        public override string ToString()
        {
            return base.ToString();
        }

        // Implements the ToString(bool, bool) method.
        public string customToString(bool includeAppInfo, 
            bool includeCustomInfo)
        {
            return (
                base.ToString(includeAppInfo, 
                includeCustomInfo));
        }

        // Gets the event identifier.
        public Guid GetEventId()
        {
            Guid evId =  EventID;
            return evId;
        }

        //Formats Web request event information.
        public override void FormatCustomEventDetails(
            WebEventFormatter formatter)
        {
            base.FormatCustomEventDetails(formatter);

            // Add custom data.
            formatter.AppendLine("");

            formatter.IndentationLevel += 1;

            formatter.TabSize = 4;

            formatter.AppendLine(
                 "*SampleWebBaseEvent Start *");

            // Display custom event information.
            formatter.AppendLine(customCreatedMsg);
            formatter.AppendLine(customRaisedMsg);
            formatter.AppendLine(firingRecordInfo);

            formatter.AppendLine(
          "* SampleWebBaseEvent End *");


            formatter.IndentationLevel -= 1;
        }
    }
}

以下是組態檔的摘錄，可讓 ASP.NET 使用 CanFire 方法來決定是否必須將引發的事件傳送給提供者進行處理。

<healthMonitoring   
  heartBeatInterval="0" enabled="true">  

    <providers>  
      <add name="SampleWebEventProvider"   
        type="SamplesAspNet.SampleEventProvider, webeventprovider, Version=1.0.1741.20369, Culture=neutral, PublicKeyToken=cf85aa6c978d9dea, processorArchitecture=MSIL" />  
    </providers>  

    <profiles>  
      <add   
        name="Custom"   
        minInstances="1"   
        maxLimit="Infinite"   
        minInterval="00:00:00"   
        custom ="SamplesAspNet.SampleWebRequestEvent,webrequestevent"   
        />  
    </profiles>  

    <eventMappings>  

      <add name="SampleWebRequestEvent" type="SamplesAspNet.SampleWebRequestEvent,webrequestevent, Version=1.0.1759.20533, Culture=neutral, PublicKeyToken=0d72899b07049076, processorArchitecture=MSIL" />  

    </eventMappings>  

    <rules>  
      <clear />  

        <add name="Custom Web Request Event"   
          eventName="SampleWebRequestEvent"  
          provider="SampleWebEventProvider" profile="Custom" />  
    </rules>  

</healthMonitoring>  

備註

ASP.NET 健康情況監視可讓生產與作業人員管理已部署的 Web 應用程式。 System.Web.Management命名空間包含負責封裝應用程式健康狀態資料的健全狀況事件種類，以及負責處理此資料的提供者類型。 它也包含支援類型，可協助管理健康情況事件。

此介面允許啟用或停用特定事件的引發。 當您實作自己的自訂事件，並想要控制傳送給相關提供者進行處理的速率時，這特別有用。

備註

這個介面不會控制引發事件的頻率。 它只會控制傳送事件資訊給提供者進行處理的頻率。

方法

CanFire(WebBaseEvent, RuleFiringRecord)

評估事件是否應該引發。

適用於

另請參閱

• RuleFiringRecord
• ASP.NET 健全狀況監視概觀