TraceContext.Write 方法

定义

将跟踪信息写入跟踪日志。Writes trace information to the trace log.

重载

Write(String)

将跟踪消息写入跟踪日志。Writes a trace message to the trace log.

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。Writes trace information to the trace log, including a message and any user-defined categories.

Write(String, String, Exception)

将跟踪信息写入跟踪日志,包括用户定义的所有类别、跟踪消息和错误消息。Writes trace information to the trace log, including any user-defined categories, trace messages, and error information.

Write(String)

将跟踪消息写入跟踪日志。Writes a trace message to the trace log.

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。The trace message to write to the log.

注解

每次 Write 调用方法时,都会向 TraceContext message 集合添加一条跟踪消息 TraceRecords ,在处理该事件时,该消息是可访问的 TraceFinishedEvery time the Write method is called, a TraceContext trace message is added to the TraceRecords messages collection, which is accessible when you handle the TraceFinished event. 添加消息,并将其 IsWarning 属性设置为 false ,并 ErrorInfo 将其属性设置为 nullThe message is added with its IsWarning property set to false and its ErrorInfo property set to null.

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。Writes trace information to the trace log, including a message and any user-defined categories.

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。The trace category that receives the message.

message
String

要写入日志的跟踪消息。The trace message to write to the log.

示例

下面的代码示例演示如何调用 Write 方法将错误跟踪消息写入跟踪日志。The following code example demonstrates how to call the Write method to write an error trace message to the trace log. 在此示例中,委托循环访问跟踪消息,并将它们写入 HTML 表;但是,您可以将相同的信息写入数据库或分析工具使用者。In this example, the delegate iterates through the trace messages and writes them as an HTML table; however, you can write the same information to a database or a profiling tool consumer.

<%@ 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

每次 Write 调用方法时,都会向 TraceContext message 集合添加一条跟踪消息 TraceRecords ,在处理该事件时,该消息是可访问的 TraceFinishedEvery time the Write method is called, a TraceContext trace message is added to the TraceRecords messages collection, which is accessible when you handle the TraceFinished event. 添加消息,并将其 IsWarning 属性设置为 false ,并 ErrorInfo 将其属性设置为 nullThe message is added with its IsWarning property set to false and its ErrorInfo property set to null.

适用于

Write(String, String, Exception)

将跟踪信息写入跟踪日志,包括用户定义的所有类别、跟踪消息和错误消息。Writes trace information to the trace log, including any user-defined categories, trace messages, and error information.

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。The trace category that receives the message.

message
String

要写入日志的跟踪消息。The trace message to write to the log.

errorInfo
Exception

包含有关错误消息的 ExceptionAn Exception that contains information about the error.

示例

下面的代码示例演示如何调用 Write 方法将错误跟踪消息写入跟踪日志。The following code example demonstrates how to call the Write method to write an error trace message to the trace log. 在此示例中,将不同的异常视为错误和警告。In this example, different exceptions are traced as errors and warnings. 当页引发时 ArgumentException ,它会使用方法编写一条警告消息 WarnWhen the page throws an ArgumentException, it writes a warning message using the Warn method. 当页引发时 InvalidOperationException ,它会使用方法编写一条错误消息 WriteWhen the page throws an InvalidOperationException, it writes an error message using the Write method.

<%@ 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 Write 调用方法时,都会向 TraceContext message 集合添加一条跟踪消息 TraceRecords ,在处理该事件时,该消息是可访问的 TraceFinishedEvery time the Write method is called, a TraceContext trace message is added to the TraceRecords messages collection, which is accessible when you handle the TraceFinished event. 添加消息,并将其 IsWarning 属性设置为 false ,并将 ErrorInfo 属性设置为参数传递的对象 errorInfoThe message is added with its IsWarning property set to false, and the ErrorInfo property is set to the object passed by the errorInfo parameter.

另请参阅

适用于