ASP.NET技巧：ASP.NET代碼裡訪問跟蹤資訊

asp.net|訪問|技巧

　　ASP.NET 2.0允許通過代碼在TraceFinished事件裡來訪問每個請求的跟蹤資訊。TraceFinished事件是由TraceContext對象引發，用於在收集完所有請求資訊後公開跟蹤訊息。可以利用此事件對跟蹤資訊進行不同的輸出。以下代碼就是用程式輸出跟蹤資訊。

　　C#:

＜%@ Page Language="C#" %＞
＜SCRIPT runat="server"＞
protected void Page_Load(object sender, System.EventArgs e)
{
　Trace.TraceFinished += new TraceContextEventHandler(OnTraceFinished);
　Trace.Write("自訂類別", "自訂跟蹤訊息");
}
private void OnTraceFinished(object sender, TraceContextEventArgs e)
{
　foreach (TraceContextRecord tcr in e.TraceRecords)
　{
　　Response.Write(string.Format(" ＜li＞跟蹤類別:{0} 跟蹤訊息:{1}", tcr.Category, tcr.Message));
　}
}
＜/SCRIPT＞ 

　　VB.NET:

＜%@ Page Language="VB"%＞
＜SCRIPT runat="server"＞
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
　AddHandler Trace.TraceFinished, AddressOf OnTraceFinished
　　Trace.Write("自訂類別", "自訂跟蹤訊息")
End Sub
Private Sub OnTraceFinished(ByVal sender As Object, ByVal e As TraceContextEventArgs)
　Dim tcr As TraceContextRecord
　For Each tcr In e.TraceRecords
　　Response.Write(String.Format(" ＜li＞跟蹤類別:{0} 跟蹤訊息:{1}", tcr.Category, tcr.Message))
　Next
End Sub

＜/SCRIPT＞