IWebEventCustomEvaluator 接口
定义
计算是否将某个事件发送给相关的提供程序以进行处理。Evaluates whether an event should be sent to the related provider for processing.
public interface class IWebEventCustomEvaluator
public interface IWebEventCustomEvaluator
type IWebEventCustomEvaluator = interface
Public Interface IWebEventCustomEvaluator
示例
下面的代码示例演示如何在 IWebEventCustomEvaluator 创建自定义事件时从接口派生。The following code example shows how to derive from the IWebEventCustomEvaluator interface when creating a custom event.
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;
}
}
}
Imports System.Text
Imports System.Web
Imports System.Web.Management
Public Class SampleWebBaseEvent
Inherits System.Web.Management.WebBaseEvent
Implements System.Web.Management.IWebEventCustomEvaluator
Private customCreatedMsg, customRaisedMsg As String
' Store firing record info.
Private Shared firingRecordInfo As String
' 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 Function CanFire( _
ByVal e As System.Web.Management.WebBaseEvent, _
ByVal rule As RuleFiringRecord) As Boolean _
Implements System.Web.Management.IWebEventCustomEvaluator.CanFire
Dim fireEvent As Boolean
Dim lastFired As String = _
rule.LastFired.ToString()
Dim timesRaised As String = _
rule.TimesRaised.ToString()
' Fire every other event raised.
fireEvent = _
IIf(rule.TimesRaised Mod 2 = 0, True, False)
If fireEvent Then
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)
End If
Return fireEvent
End Function 'CanFire
' Invoked in case of events identified only by
' their event code.
Public Sub New(ByVal msg As String, _
ByVal eventSource As Object, _
ByVal eventCode As Integer)
MyBase.New(msg, eventSource, eventCode)
' Perform custom initialization.
customCreatedMsg = String.Format( _
"Event created at: {0}", DateTime.Now.TimeOfDay.ToString())
End Sub
' Invoked in case of events identified by their
' event code.and related event detailed code.
Public Sub New(ByVal msg As String, _
ByVal eventSource As Object, _
ByVal eventCode As Integer, _
ByVal eventDetailCode As Integer)
MyBase.New(msg, eventSource, _
eventCode, eventDetailCode)
' Perform custom initialization.
customCreatedMsg = String.Format( _
"Event created at: {0}", DateTime.Now.TimeOfDay.ToString())
End Sub
' Raises the SampleWebBaseEvent.
Public Overrides Sub Raise()
' Perform custom processing.
customRaisedMsg = String.Format( _
"Event raised at: {0}", DateTime.Now.TimeOfDay.ToString())
' Raise the event.
MyBase.Raise()
End Sub
' Raises the SampleWebBaseEvent.
Public Sub CustomRaise(ByVal evnt _
As System.Web.Management.WebBaseEvent)
' Raise the event.
Raise(evnt)
End Sub
' Gets the event code.
Public Function GetEventCode(ByVal detail _
As Boolean) As Integer
Dim eCode As Integer
If Not detail Then
' Get the event code.
eCode = EventCode
' Get the detail event code.
Else
eCode = EventDetailCode
End If
Return eCode
End Function 'GetEventCode
' Gets the event sequence.
Public Function GetEventSequence() As Long
' Get the event sequence.
Dim eventSequence As Long = eventSequence
Return eventSequence
End Function 'GetEventSequence
' Gets the event source.
Public Function GetEventSource() As [Object]
' Get the event source.
Dim [source] As [Object] = Me.EventSource
Return [source]
End Function 'GetEventSource
' Gets the event time.
Public Function GetEventTime() As DateTime
' Get the event source.
Dim eTime As DateTime = EventTime
Return eTime
End Function 'GetEventTime
' Gets the event time.
Public Function GetEventTimeUtc() As DateTime
' Get the event source.
Dim eTime As DateTime = EventTimeUtc
Return eTime
End Function 'GetEventTimeUtc
' Gets the event sequence.
Public Function GetEventMessage() As String
' Get the event message.
Dim eventMsg As String = Message
Return eventMsg
End Function 'GetEventMessage
' Gets the current application information.
Public Function GetEventAppInfo() As WebApplicationInformation
' Get the event message.
Dim appImfo As WebApplicationInformation = _
ApplicationInformation
Return appImfo
End Function 'GetEventAppInfo
' Implements the ToString() method.
Public Overrides Function ToString() As String
Return MyBase.ToString()
End Function 'ToString
' Implements the ToString(bool, bool) method.
Public Function customToString(ByVal includeAppInfo As Boolean, _
ByVal includeCustomInfo As Boolean) As String
Return MyBase.ToString(includeAppInfo, includeCustomInfo)
End Function 'customToString
' Gets the event identifier.
Public Function GetEventId() As Guid
Dim evId As Guid = EventID
Return evId
End Function 'GetEventId
'Formats Web request event information.
Public Overrides Sub FormatCustomEventDetails( _
ByVal formatter As WebEventFormatter)
MyBase.FormatCustomEventDetails(formatter)
' Add custom data.
formatter.AppendLine("")
formatter.IndentationLevel += 1
formatter.TabSize = 4
formatter.AppendLine("*SampleWebBaseEvent Start *")
formatter.AppendLine("Custom information goes here")
formatter.AppendLine("* SampleWebBaseEvent End *")
' Display custom event timing.
formatter.AppendLine(customCreatedMsg)
formatter.AppendLine(customRaisedMsg)
formatter.IndentationLevel -= 1
End Sub
End Class
下面是配置文件的摘录,使 ASP.NET 可以使用 CanFire 方法来确定是否必须将引发的事件发送到提供程序进行处理。The following is an excerpt of the configuration file that enables ASP.NET to use the CanFire method to decide whether the raised event must be sent to the provider for processing.
<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>
注解
ASP.NET health monitoring 允许生产和运营人员管理已部署的 Web 应用程序。ASP.NET health monitoring allows production and operations staff to manage deployed Web applications. System.Web.Management命名空间包含的运行状况事件类型负责打包应用程序运行状况数据,以及负责处理此数据的提供程序类型。The System.Web.Management namespace contains the health-event types responsible for packaging application health-status data and the provider types responsible for processing this data. 它还包含在运行状况事件的管理过程中可帮助的支持类型。It also contains supporting types that help during the management of health events.
此接口允许启用或禁用特定事件的激发。This interface allows enabling or disabling the firing of a specific event. 当你实现自己的自定义事件,并且想要控制将其发送到相关提供程序进行处理的速率时,此方法特别有用。This is especially useful when you implement your own custom event and want to control the rate at which it is sent to the related provider for processing.
备注
此接口不控制事件的引发频率。This interface does not control how often the event is raised. 它仅控制将事件信息发送到提供程序进行处理的频率。It only controls how often the event information is sent to the provider for processing.
方法
| CanFire(WebBaseEvent, RuleFiringRecord) |
计算是否应该引发某个事件。Evaluates whether an event should be raised. |