TraceContext.Write 方法

定义

命名空间:: System.Web

程序集:: System.Web.dll

重要

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将跟踪信息写入跟踪日志。

重载

名称	说明
Write(String)	将跟踪消息写入跟踪日志。
Write(String, String)	将跟踪信息写入跟踪日志，包括消息和任何用户定义的类别。
Write(String, String, Exception)	将跟踪信息写入跟踪日志，包括任何用户定义的类别、跟踪消息和错误信息。

Write(String)

将跟踪消息写入跟踪日志。

public:
 void Write(System::String ^ message);

public void Write(string message);

member this.Write : string -> unit

Public Sub Write (message As String)

参数

message: String

要写入日志的跟踪消息。

注解

每次调用该方法时Write，都会向消息集合添加TraceContext跟踪TraceRecords消息，该集合在处理TraceFinished事件时可访问。将添加消息的属性 IsWarning 设置为 false ，并且其 ErrorInfo 属性设置为 null.

另请参阅

ASP.NET 跟踪概述

适用于

Write(String, String)

将跟踪信息写入跟踪日志，包括消息和任何用户定义的类别。

public:
 void Write(System::String ^ category, System::String ^ message);

public void Write(string category, string message);

member this.Write : string * string -> unit

Public Sub Write (category As String, message As String)

参数

category: String

接收消息的跟踪类别。

message: String

要写入日志的跟踪消息。

示例

下面的代码示例演示如何调用 Write 方法以将错误跟踪消息写入跟踪日志。在此示例中，委托循环访问跟踪消息，并将其作为 HTML 表写入;但是，可以将相同的信息写入数据库或分析工具使用者。

<%@ 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.
    Response.Write("<table>");
    foreach(object o in e.TraceRecords)
    {
        r = (TraceContextRecord)o;
        Response.Write(String.Format("<tr><td>{0}</td><td>{1}</td></tr>", r.Message, r.Category));        
    }
    Response.Write("</table>");
}       
</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.
    Response.Write("<table>")
    For Each o In e.TraceRecords
        r = CType(o, TraceContextRecord)
        Response.Write(String.Format("<tr><td>{0}</td><td>{1}</td></tr>", r.Message, r.Category))
    Next
    Response.Write("</table>")

End Sub ' OnTraceFinished
</script>

注解

另请参阅

ASP.NET 跟踪概述

适用于

Write(String, String, Exception)

将跟踪信息写入跟踪日志，包括任何用户定义的类别、跟踪消息和错误信息。

public:
 void Write(System::String ^ category, System::String ^ message, Exception ^ errorInfo);

public void Write(string category, string message, Exception errorInfo);

member this.Write : string * string * Exception -> unit

Public Sub Write (category As String, message As String, errorInfo As Exception)

参数

category: String

接收消息的跟踪类别。

message: String

要写入日志的跟踪消息。

errorInfo: Exception

包含有关错误的信息的一个 Exception 。

示例

下面的代码示例演示如何调用 Write 方法以将错误跟踪消息写入跟踪日志。在此示例中，将跟踪不同的异常作为错误和警告。当页面引发时 ArgumentException，它会使用 Warn 该方法写入警告消息。当页面引发时 InvalidOperationException，它会使用 Write 该方法写入错误消息。

<%@ 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);

    try {
        throw new ArgumentException("Trace Test");
    }
    catch (InvalidOperationException ioe) {    
        // You can write an error trace message using the Write method.
        Trace.Write("Exception Handling", "Exception: Page_Load.", ioe);
    }
    catch (ArgumentException ae) {    
        // You can write a warning trace message using the Warn method.
        Trace.Warn("Exception Handling", "Warning: Page_Load.", ae);
    }
}
 
// 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;
        if (r.IsWarning) {
            Response.Write(String.Format("warning message: {0} <BR>", r.Message));
        }
        else {
            Response.Write(String.Format("error 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

    Try 
    Dim ae As New ArgumentException("Trace Test")
        Throw ae
    
    catch ioe As InvalidOperationException
        ' You can write an error trace message using the Write method.
        Trace.Write("Exception Handling", "Exception: Page_Load.", ioe)
    
    Catch ae As ArgumentException
        ' You can write a warning trace message using the Warn method.
        Trace.Warn("Exception Handling", "Warning: Page_Load.", ae)

    End Try

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)
    If r.IsWarning Then
            Response.Write(String.Format("warning message: {0} <BR>", r.Message))
        Else
            Response.Write(String.Format("error message: {0} <BR>", r.Message))
        End If
    Next

End Sub	' OnTraceFinished
</script>

注解

每次调用该方法时Write，都会向消息集合添加TraceContext跟踪TraceRecords消息，该集合在处理TraceFinished事件时可访问。将添加消息，其 IsWarning 属性设置为 false该消息，并将 ErrorInfo 该属性设置为参数 errorInfo 传递的对象。

另请参阅

适用于

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