в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

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2010-05-26T11:56:25Z

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== Enable trace in Web.config==



<source lang="csharp">
File: web.config
<configuration>
<system.web>
<trace enabled="true"/>
</system.web>
</configuration></source>

== Enabling Page Level Tracing==



<source lang="csharp">
<%@ Page Language="C#" Trace="true" %>
<script runat="server">
private void Page_Load(Object Source, EventArgs E)
{
Trace.Write("Page_Load", "Declaring and initializing variables.");
int _A = 10;
int _B = 20;

Trace.Write("Page_Load", "Applying add operation.");
_A += _B;

Trace.Write("Page_Load", "Variable values changed.");
Trace.Write("_A", _A.ToString());
Trace.Write("_B", _B.ToString());
}
</script>
<html>
<head>
<title>Enabling Page Level Tracing</title>
</head>
<body>
<form runat="server">

</form>
</body>
</html></source>

== Set Page.Trace.IsEnabled to true (C#)==



<source lang="csharp">
File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="SimpleTrace" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
</head>
<body>
<form id="form1" runat="server">
<div>
A Simple Tracing Example<br />
<br />
<asp:Button ID="cmdTrace" runat="server" OnClick="cmdTrace_Click" Text="Trace" /></div>
</form>
</body>
</html>

File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class SimpleTrace : System.Web.UI.Page
{
protected void cmdTrace_Click(object sender, EventArgs e)
{
Page.Trace.IsEnabled = true;
Session["TestString"] = "This is just a string.";
Session["MyDataSet"] = new DataSet();
}
}</source>

== Trace.IsEnabled==



<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>

== Trace to a file==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Tracing" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>Logging trace output to <asp:Literal runat="server" Text="<%$ appSettings:traceFile %>" /></h2>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.IO;
using System.Web;
using System.Configuration;
public partial class Tracing : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Trace.TraceFinished += Trace_Finished;
Trace.Write("Using Page Trace", "Subscribed to TraceFinished event");
}
void Trace_Finished(Object sender, TraceContextEventArgs e)
{
string traceFile = ConfigurationManager.AppSettings["traceFile"];
using (StreamWriter w = File.AppendText(traceFile))
{
int i = 0;
foreach (TraceContextRecord r in e.TraceRecords)
w.WriteLine("{0}) {1}:{2}", ++i, r.Category, r.Message);
}
}
}
File: Web.config
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="traceFile" value="c:\temp\trace_log.txt"/>
</appSettings>
<system.web>
<compilation debug="true"/>
<trace enabled="true" pageOutput="false" localOnly="true" />
</system.web>
</configuration></source>

== Use Trace.Write to write message (C#)==



<source lang="csharp">
File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="TraceExample" Trace="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="cmdWrite" runat="server" OnClick="cmdWrite_Click" Text="Write" />
<asp:Button ID="cmdWriteCategory" runat="server" OnClick="cmdWriteCategory_Click"
Text="Write Category" />
<asp:Button ID="cmdError" runat="server" OnClick="cmdError_Click" Text="Write Error" />

</div>
</form>
</body>
</html>

File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class TraceExample : System.Web.UI.Page
{
protected void cmdError_Click(object sender, EventArgs e)
{
try
{
DivideNumbers(5, 0);
}
catch (Exception err)
{
Trace.Warn("cmdError_Click", "Caught Error", err);
}
}
protected void cmdWrite_Click(object sender, EventArgs e)
{
Trace.Write("About to place an item in session state.");
Session["Test"] = "Contents";
Trace.Write("Placed item in session state.");
}
protected void cmdWriteCategory_Click(object sender, EventArgs e)
{
Trace.Write("Page_Load", "About to place an item in session state.");
Session["Test"] = "Contents";
Trace.Write("Page_Load", "Placed item in session state.");
}
private decimal DivideNumbers(decimal number, decimal divisor)
{
return number / divisor;
}
}</source>

== Write warning message with Trace.Warn==



<source lang="csharp">
<%@ Page Language="VB" Trace="true"%>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<script language="VB" runat="server">
sub Page_Load(Sender as Object, e as EventArgs)
Trace.Warn("Custom", "Page loading...")
if not Page.IsPostBack then
Trace.Warn("Custom", "No post")
CreateData()
end if
end sub

sub CreateData
dim source as DataView
source = Cache("DataView")

if source is nothing then
dim strConnString as string = "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
& "DATA SOURCE=" _
& Server.MapPath("EmployeeDatabase.mdb;")

Trace.Warn("Custom", "Creating OleDbDataAdapter...")
dim objCmd as OleDbDataAdapter = new _
OleDbDataAdapter("select * from employee", _
strConnString)
Trace.Warn("Custom", "SQL value: " & _
objCmd.SelectCommand.rumandText)
dim ds as DataSet = new DataSet()
objCmd.Fill(ds, "employee")

source = new DataView(ds.Tables(0))
Trace.Warn("Custom", "Inserting into cache...")
Cache.Insert("DataView", source)

lblMessage.Text = "Data set created explicitly"
else
lblMessage.Text = "Data set retrieved from " & _
"cache<br>"
end if
Trace.Warn("Custom", "Binding data...")
dgData.DataSource = source
dgData.DataBind()
end sub

sub ExpireCache(Sender as Object, e as EventArgs)
Trace.Warn("Custom", _
"Removing from cache, call CreateData")
dim dv as dataview = Cache.Remove("DataView")
CreateData()
end sub
</script>
<html><body>
<form runat="server">
<asp:Label id="lblMessage" runat="server"
maintainState=false/>
<asp:Button id="btSubmit" runat="server"
text="Expire Cache"
OnClick="ExpireCache"/>
<asp:DataGrid id="dgData" runat="server"
BorderColor="black" GridLines="Vertical"
cellpadding="4" cellspacing="0"
width="450" Font-Name="Arial"
Font-Size="8pt"
/>
</form>
</body></html>
File: web.config
<configuration>
<system.web>
<trace enabled="true"/>
</system.web>
</configuration></source>

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в 15:30, 26 мая 2010

Admin: 1 версия