ASP.Net/Development/Trace

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Is trace enabled (VB.net)

   <source lang="csharp">

<%@ Page Language="vb" %> <html> 

  <head>
     <title></title>
     <script runat="server">
        Sub Page_Load()
           If Trace.IsEnabled = True Then
              Message.Text = "Tracing is enabled."
           Else
              Message.Text = "Tracing is not enabled."
           End If
        End Sub
     </script>
  </head>

<body> 

  <asp:label id="Message" runat="server"/>

</body> </html> 

      </source>


Page Trace (C#)

   <source lang="csharp">

<%@ Page Language="C#" Debug="true" Trace="true" %> <script runat="server"> 

   void Page_Init()
   {
       Trace.Write("NOTE - First line of Page_Init");
   }

</script> <html> <head> 

   <title>Demonstration of Page Events</title>

</head> <body> 

   <form runat="server">
       <asp:Button id="Button1" runat="server" Text="Submit"></asp:Button>
       

   </form>

</body> </html> 

      </source>


Page Trace in code behind (C#)

   <source lang="csharp">

<%@ Page language="c#" src="SimpleTrace.aspx.cs" AutoEventWireup="false" Inherits="SimpleTrace" %> <HTML> 

 <body>
   <FORM id="Form1" method="post" runat="server">
     <asp:Label id="Label1" runat="server">A Simple Tracing Example</asp:Label>

     

     <asp:Button id="cmdTrace" runat="server" Width="104px" Text="Trace"></asp:Button>

     

   </FORM>
 </body>

</HTML> <%-- using System; using System.Collections; using System.ruponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; 

 public class SimpleTrace : System.Web.UI.Page
 {
   protected System.Web.UI.WebControls.Label Label1;
   protected System.Web.UI.WebControls.Button cmdTrace;
 
   private void Page_Load(object sender, System.EventArgs e)
   {
   }
   #region Web Form Designer generated code
   override protected void OnInit(EventArgs e)
   {
     InitializeComponent();
     base.OnInit(e);
   }
   
   private void InitializeComponent()
   {    
     this.cmdTrace.Click += new System.EventHandler(this.cmdTrace_Click);
     this.Load += new System.EventHandler(this.Page_Load);
   }
   #endregion
   private void cmdTrace_Click(object sender, System.EventArgs e)
   {
     Trace.IsEnabled=true;
   }
 }

--%> 

      </source>


Page trace mode (VB.net)

   <source lang="csharp">

<%@ Page trace= "true" %> <script runat = "server"> Public Function Subtract( intFirst As Integer, intSecond As Integer) As Integer 

 Trace.Write( " intFirst : ", intFirst)
 Trace.Write("intSecond : ", intSecond)
 return intFirst - intSecond

End Function </script> The value of 45 minus 30 is : <%=Subtract(45, 30) %> 

      </source>


Trace asp calendar event (C#)

   <source lang="csharp">

<%@ Page Language="C#" Trace="true" %> <script runat="server"> 

   void Page_Load()
   {
       Label1.Text = "www.nfex.ru";
       Calendar1.TodaysDate = DateTime.Now;
   }

</script> <html> <head> 

   <title>Show Trace</title>

</head> <body> 

   <form id="form1" runat="server">

   <asp:Label
       id="Label1"
       Runat="server" />
   <asp:Calendar
       id="Calendar1"
       TodayDayStyle-BackColor="Yellow"
       Runat="server" />
   

   </form>

</body> </html> 

      </source>


Trace for loop (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" Trace="true" %> <script runat="server"> 

   Sub Page_Load()
       For counter As Integer = 0 To 9
           ListBox1.Items.Add("item " & counter.ToString())
           Trace.Warn("counter=" & counter.ToString())
       Next
   End Sub

</script> <html> <head> 

   <title>Page Trace</title>

</head> <body> 

   <form id="form1" runat="server">

   <asp:ListBox
       id="ListBox1"
       Runat="server" />
   

   </form>

</body> </html> 

      </source>


Use Trace to debug (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" Debug="true" Trace="true" %> <%@ import Namespace="System.Data" %> <%@ import Namespace="System.Data.Sqlclient" %> <script runat="server"> 

   Sub Button1_Click(sender As Object, e As EventArgs)
     Trace.Write ("Click", "Start")
     Dim conn As New _
          SqlConnection("Server=foo;Database=pubs;Trusted_Connection=true") 
     Dim cmd As New SqlCommand("select * from authors", conn)
     Try
       Trace.Write("Opening connection")
       Conn.Open()
       DataGrid1.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection)
       DataGrid1.DataBind()
     Catch ex As Exception
       Trace.Warn(ex.Message)
       Label1.Text = "Could not connect to the database - " & _
                     "please try again later."
     End Try
   End Sub

</script> <html> <head> </head> <body> 

   <form runat="server">
       <asp:Button id="Button1" onclick="Button1_Click" runat="server" Text="Button"></asp:Button>
       <asp:DataGrid id="DataGrid1" runat="server"></asp:DataGrid>
       <asp:Label id="Label1" runat="server">Label</asp:Label>
       
   </form>

</body> </html> 

      </source>


Write debug information to trace log (C#)

   <source lang="csharp">

<%@ Page trace= "true" %> <script Language="c#" runat = "server"> 

 public int Subtract(int intFirst, int intSecond)
 {
   Trace.Write(" intFirst : ", intFirst.ToString());
   Trace.Write("intSecond : ", intSecond.ToString());
   return intFirst - intSecond;
 }

</script> The value of 45 minus 30 is : <%=Subtract(45, 30) %> 

      </source>


Write to Trace log in event action (C#)

   <source lang="csharp">

<%@ Page language="c#" src="TraceExample.aspx.cs" AutoEventWireup="false" Inherits="TraceExample" %> <HTML> 

 <body>
   <form id="Form1" method="post" runat="server">

       <asp:Button id="cmdWrite" style="Z-INDEX: 101; LEFT: 16px; POSITION: absolute; TOP: 64px" runat="server" Text="Write Message" Width="128px" Height="24px" Font-Size="X-Small" Font-Names="Verdana"></asp:Button>
       <asp:Label id="Label1" runat="server" style="Z-INDEX: 102; LEFT: 16px; POSITION: absolute; TOP: 16px">A Simple Tracing Example</asp:Label>
       <asp:Button id="cmdWriteCategory" style="Z-INDEX: 103; LEFT: 160px; POSITION: absolute; TOP: 64px" runat="server" Text="Write Message With Category" Width="216px" Height="24px" Font-Size="X-Small" Font-Names="Verdana"></asp:Button>
       <asp:Button id="cmdError" style="Z-INDEX: 104; LEFT: 16px; POSITION: absolute; TOP: 96px" runat="server" Text="Write Exception" Width="128px" Height="24px" Font-Size="X-Small" Font-Names="Verdana"></asp:Button>
<asp:Button id="cmdSession" style="Z-INDEX: 105; LEFT: 160px; POSITION: absolute; TOP: 96px" runat="server" Text="Add Session Item" Width="136px" Height="24px" Font-Names="Verdana"></asp:Button>
   </form>
   

 </body>

</HTML>

<%-- using System; using System.Collections; using System.ruponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; 

 public class TraceExample : System.Web.UI.Page
 {
   protected System.Web.UI.WebControls.Button cmdWrite;
   protected System.Web.UI.WebControls.Label Label1;
   protected System.Web.UI.WebControls.Button cmdWriteCategory;
   protected System.Web.UI.WebControls.Button cmdError;
   protected System.Web.UI.WebControls.Button cmdSession;
 
   private void Page_Load(object sender, System.EventArgs e)
   {
     Trace.IsEnabled = true;
   }
   #region Web Form Designer generated code
   override protected void OnInit(EventArgs e)
   {
     //
     // CODEGEN: This call is required by the ASP.NET Web Form Designer.
     //
     InitializeComponent();
     base.OnInit(e);
   }
   
   /// <summary>
   /// Required method for Designer support - do not modify
   /// the contents of this method with the code editor.
   /// </summary>
   private void InitializeComponent()
   {    
     this.cmdWrite.Click += new System.EventHandler(this.cmdWrite_Click);
     this.cmdWriteCategory.Click += new System.EventHandler(this.cmdWriteCategory_Click);
     this.cmdError.Click += new System.EventHandler(this.cmdError_Click);
     this.cmdSession.Click += new System.EventHandler(this.cmdSession_Click);
     this.Load += new System.EventHandler(this.Page_Load);
   }
   #endregion
   private void cmdWrite_Click(object sender, System.EventArgs e)
   {
     
     Trace.Write("About to place an item in session state.");
     Session["Test"] = "Contents";
     Trace.Write("Placed item in session state.");
   }
   private void cmdWriteCategory_Click(object sender, System.EventArgs e)
   {
     Trace.Write("Page_Load", "About to place an item in session state.");
     Session["Test"] = "string in session";
     Trace.Write("Page_Load", "Placed item in session state.");
   }

   private decimal DivideNumbers(decimal number, decimal divisor)
   {
     return number/divisor;
   }
   private void cmdError_Click(object sender, System.EventArgs e)
   {
     try
     {
       DivideNumbers(5, 0);
     }
     catch (Exception err)
     {
       Trace.Warn("cmdError_Click", "Caught Error", err);
     }
   }
   private void cmdSession_Click(object sender, System.EventArgs e)
   {
     DataSet ds = new DataSet();
     Session["MyDataSet"] = ds;
   }
 }

--%> 

      </source>


Write to Trace (VB.net)

   <source lang="csharp">

<%@ Page Trace="true"%> <script language="VB" runat="server"> 

Sub WriteToTrace()
    Dim intCounter as integer
    intCounter=1
    Trace.Write ("FirstCategory", "Variable is initialized")
    do while intCounter > 10
     intCounter = intCounter + 1
    loop 
    if intCounter < 10 then 
        Trace.Warn("ErrorCategory", "Value of intCounter is not incrementing")
    end if
end Sub

</script> <% 

WriteToTrace()

%> 

      </source>


Write trace warn (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" Trace="True" %> <html> <head> 

  <title>Tracing Sample</title>
  <script runat="server">
     Sub Page_Load()
        If Page.Trace.IsEnabled = True Then
           Trace.Write("MyCategory", "Hello, Trace!")
           Trace.Warn("MyCategory", "This text will be red!")
           Message.Text = "Tracing is enabled for this page."
        Else
           Message.Text = "Tracing is not enabled for this page."
        End If
     End Sub
  </script>

</head> <body> 

  <asp:label id="Message" runat="server"/>

</body> </html> 

      </source>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Development/Trace&oldid=1699»