引發自訂 ASP.NET 健康監視事件範例
更新：2007 年 11 月
這個主題中的程式碼範例示範如何實作能夠引發自訂 ASP.NET 健康監視事件的 IHttpModule 模組。如需如何使用這個程式碼範例的詳細資訊，請參閱 HOW TO：實作和引發自訂 ASP.NET 健康監視事件。
範例
下列程式碼範例示範如何衍生自 WebRequestEvent 類別以建立自訂 ASP.NET 健康監視事件。為了提供指示，程式碼會包含在引發自訂事件的 HTTP 模組實作中。此外，您也可以從其他 ASP.NET 網頁或組件引發自訂事件。與內建 ASP.NET 健康監視事件不同之處在於，自訂事件必須明確引發。
using System;
using System.Web;
using System.Web.Management;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Samples.AspNet.Management
{
public class CustomWebEvents : Page, IHttpModule
{
public override void Dispose()
{
}
// Add event handlers to the HttpApplication.
public new void Init(HttpApplication httpApp)
{
httpApp.BeginRequest +=
new EventHandler(OnBeginRequest);
httpApp.EndRequest +=
new EventHandler(OnEndRequest);
}
// Issues a custom begin request event.
public void OnBeginRequest(Object sender, EventArgs e)
{
HttpApplication httpApp = sender as HttpApplication;
try
{
// Make sure to be outside the forbidden range.
System.Int32 myCode = WebEventCodes.WebExtendedBase + 30;
SampleWebRequestEvent swre =
new SampleWebRequestEvent(
"SampleWebRequestEvent Start", this, myCode);
// Raise the event.
swre.Raise();
}
catch (Exception ex)
{
httpApp.Context.Response.Output.WriteLine(
ex.ToString());
}
}
// Issues a custom end request event.
public void OnEndRequest(Object sender, EventArgs e)
{
HttpApplication httpApp = sender as HttpApplication;
try
{
// Make sure to be outside the forbidden range.
System.Int32 myCode = WebEventCodes.WebExtendedBase + 40;
SampleWebRequestEvent swre =
new SampleWebRequestEvent(
"SampleWebRequestEvent End", this, myCode);
// Raise the event.
swre.Raise();
}
catch (Exception ex)
{
httpApp.Context.Response.Output.WriteLine(
ex.ToString());
}
}
}
public class SampleWebRequestEvent : System.Web.Management.WebRequestEvent
{
private string customCreatedMsg;
private string customRaisedMsg;
// Invoked in case of events identified only by their event code.
public SampleWebRequestEvent(
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 SampleWebRequestEvent(
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 SampleWebRequestEvent.
public override void Raise()
{
// Perform custom processing.
customRaisedMsg = string.Format("Event raised at: {0}",
EventTime.ToString());
// Raise the event.
base.Raise();
}
//Formats Web request event information.
public override void FormatCustomEventDetails(
WebEventFormatter formatter)
{
// Add custom data.
formatter.AppendLine("");
formatter.IndentationLevel += 1;
formatter.AppendLine("* Custom Request Information Start *");
// Display custom event timing.
formatter.AppendLine(customCreatedMsg);
formatter.AppendLine(customRaisedMsg);
formatter.AppendLine("* Custom Request Information End *");
formatter.IndentationLevel -= 1;
}
}
}