TraceContextRecord 类

定义

public ref class TraceContextRecord sealed

public sealed class TraceContextRecord

type TraceContextRecord = class

Public NotInheritable Class TraceContextRecord

继承

Object

TraceContextRecord

示例

下面的代码示例演示如何注册 TraceContextEventHandler 委托来处理 TraceFinished 事件。 在此示例中，OnTraceFinished方法通过 TraceRecords 属性访问对象的集合TraceContextRecord，循环访问对象集合，并将其写入响应流。

<%@ Page language="c#" Trace="true" %>
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
    // Register a handler for the TraceFinished event.
    Trace.TraceFinished += new 
        TraceContextEventHandler(this.OnTraceFinished);

    // Write a trace message.
    Trace.Write("Web Forms Infrastructure Methods", "USERMESSAGE: Page_Load complete.");
}
 
// A TraceContextEventHandler for the TraceFinished event.
void OnTraceFinished(object sender, TraceContextEventArgs e)
{
    TraceContextRecord r = null;    
    
    // Iterate through the collection of trace records and write 
    // them to the response stream.
    foreach(object o in e.TraceRecords)
    {
        r = (TraceContextRecord)o;
        Response.Write(String.Format("trace message: {0} <BR>", r.Message));
    }
}       
</script>

<%@ Page language="VB" Trace="true" %>
<script runat="server">
' The Page_Load method.
Private Sub Page_Load(sender As Object, e As EventArgs)

    ' Register a handler for the TraceFinished event.
    AddHandler Trace.TraceFinished, AddressOf OnTraceFinished

    ' Write a trace message.
    Trace.Write("Web Forms Infrastructure Methods", "USERMESSAGE: Page_Load complete.")
End Sub ' Page_Load
 
' A TraceContextEventHandler for the TraceFinished event.
Private Sub OnTraceFinished(sender As Object, e As TraceContextEventArgs)

    Dim r As TraceContextRecord
    Dim o As Object
    
    ' Iterate through the collection of trace records and write 
    ' them to the response stream.

    For Each o In e.TraceRecords
        r = CType(o, TraceContextRecord)
        Response.Write(String.Format("trace message: {0} <BR>", r.Message))
    Next

End Sub ' OnTraceFinished
</script>

注解

对象 TraceContextRecord 封装跟踪消息、类别、任何关联的 Exception以及跟踪记录是否由 TraceContext.Warn 方法写入。

每次调用 TraceContext.Write 和 TraceContext.Warn 方法都会生成一个 TraceContextRecord 对象，该对象将添加到消息集合中 TraceContextEventArgs.TraceRecords 。 可以通过处理 TraceFinished 事件来访问记录集合。

另请参阅

• TraceContextEventArgs
• TraceContextEventHandler
• ASP.NET 跟踪概述
• 如何：启用 ASP.NET 页跟踪