ASP.NET Tutorial/Development/Eventlog

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Catch exception and log it (C#)

<%@ Page %>
<script language="C#" runat="server">
  private void Page_Load(object sender, System.EventArgs e)
  {
    int a=0;
    System.Diagnostics.EventLog myEventLog;
    
    try {
      a=1/a;
    } catch (Exception ex) {  
      myEventLog=new System.Diagnostics.EventLog();
      myEventLog.Log="Application";
      myEventLog.Source="asp";
      myEventLog.WriteEntry(ex.ToString());
    }
  }
</script>
<html>
  <body>
    <form id="form1" method="post" runat="server">
    </form>
  </body>
</html>


Catch exception and log it (VB)

<%@ Page %>
<script language="vb" runat="server">
  Sub Page_Load(sender As Object, e As EventArgs)
    Dim a as Integer=0
    Dim myEventLog as System.Diagnostics.EventLog
    
    Try
      a=1/a
    Catch ex as Exception
      myEventLog=new System.Diagnostics.EventLog()
      myEventLog.Log="Application"
      myEventLog.Source="asp"
      myEventLog.WriteEntry(ex.ToString())
    End Try
  End Sub
</script>
<html>
  <body>
    <form id="form1" method="post" runat="server">
    </form>
  </body>
</html>


List all event log entries (C#)

File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="EventReviewPage" %>
<!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:Label ID="Label1" runat="server" Text="Event Log:"/>
        <asp:TextBox ID="txtLog" runat="server">your Name</asp:TextBox>&nbsp;
        <asp:CheckBox ID="chkAll" runat="server" AutoPostBack="True" OnCheckedChanged="chkAll_CheckedChanged"
            Text="Get all entries for this log" /><br />
        <asp:Label ID="Label2" runat="server" Text="Source:"/>
        <asp:TextBox ID="txtSource" runat="server">DivideByZeroApp</asp:TextBox><br />
        <br />
        <asp:Button ID="cmdGet" runat="server" OnClick="cmdGet_Click" Text="Get Records" /><br />
        <br />
        <asp:Panel ID="Panel1" runat="server" BorderStyle="Groove" BorderWidth="2px" Height="168px"
            ScrollBars="Vertical" Width="488px">
            <asp:Label ID="lblResult" runat="server"></asp:Label></asp:Panel>
    
    </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;
using System.Diagnostics;
public partial class EventReviewPage : System.Web.UI.Page
{
    protected void chkAll_CheckedChanged(object sender, EventArgs e)
    {
        if (chkAll.Checked)
        {
            txtSource.Text = "";
            txtSource.Enabled = false;
        }
        else
        {
            txtSource.Enabled = true;
        }
    }
    protected void cmdGet_Click(object sender, EventArgs e)
    {
        lblResult.Text = "";
        if (!EventLog.Exists(txtLog.Text))
        {
            lblResult.Text = "The event log " + txtLog.Text;
            lblResult.Text += " doesn"t exist.";
        }
        else
        {
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            EventLog log = new EventLog(txtLog.Text);
            foreach (EventLogEntry entry in log.Entries)
            {
                if (chkAll.Checked || entry.Source == txtSource.Text)
                {
                    sb.Append("<b>Entry Type:</b> ");
                    sb.Append(entry.EntryType.ToString());
                    sb.Append("<br /><b>Message:</b> ");
                    sb.Append(entry.Message);
                    sb.Append("<br /><b>Time Generated:</b> ");
                    sb.Append(entry.TimeGenerated);
                    sb.Append("<br /><br />");
                }
            }
            lblResult.Text = sb.ToString();
        }
    }
}


Write the exception information to the event log (C#)

File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ErrorTestLog" %>
<!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:Label ID="Label1" runat="server" Text="A:"></asp:Label>
        <asp:TextBox ID="txtA" runat="server">5</asp:TextBox><br />
        <asp:Label ID="Label2" runat="server" Text="B:"></asp:Label>
        <asp:TextBox ID="txtB" runat="server">0</asp:TextBox><br />
        <br />
        <asp:Button ID="cmdCompute" runat="server" OnClick="cmdCompute_Click" Text="Divide A / B" /><br />
        <br />
        <br />
        <asp:Label ID="lblResult" runat="server" Font-Bold="True" ForeColor="Red"></asp:Label></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;
using System.Drawing;
using System.Diagnostics;
public partial class ErrorTestLog : System.Web.UI.Page
{
    protected void cmdCompute_Click(object sender, EventArgs e)
    {
        try
        {
            decimal a, b, result;
            a = Decimal.Parse(txtA.Text);
            b = Decimal.Parse(txtB.Text);
            result = a / b;
            lblResult.Text = result.ToString();
            lblResult.ForeColor = Color.Black;
        }
        catch (Exception err)
        {
            lblResult.Text = "<b>Message:</b> " + err.Message + "<br /><br />";
            lblResult.Text += "<b>Source:</b> " + err.Source + "<br /><br />";
            lblResult.Text += "<b>Stack Trace:</b> " + err.StackTrace;
            lblResult.ForeColor = Color.Red;
            EventLog log = new EventLog();
            log.Source = "DivisionPage";
            log.WriteEntry(err.Message, EventLogEntryType.Error);
        }
    }
}


Write the information to the event log. Register the event source if needed. (C#)

File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ErrorTestCustomLog" %>
<!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:Label ID="Label1" runat="server" Text="A:"></asp:Label>
        <asp:TextBox ID="txtA" runat="server">5</asp:TextBox><br />
        <asp:Label ID="Label2" runat="server" Text="B:"></asp:Label>
        <asp:TextBox ID="txtB" runat="server">0</asp:TextBox><br />
        <br />
        <asp:Button ID="cmdCompute" runat="server" OnClick="cmdCompute_Click" Text="Divide A / B" /><br />
        <br />
        <br />
        <asp:Label ID="lblResult" runat="server" Font-Bold="True" ForeColor="Red"></asp:Label></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;
using System.Diagnostics;
using System.Drawing;
public partial class ErrorTestCustomLog : System.Web.UI.Page
{
    protected void cmdCompute_Click(object sender, EventArgs e)
    {
        try
        {
            decimal a, b, result;
            a = Decimal.Parse(txtA.Text);
            b = Decimal.Parse(txtB.Text);
            result = a / b;
            lblResult.Text = result.ToString();
            lblResult.ForeColor = Color.Black;
        }
        catch (Exception err)
        {
            lblResult.Text = "<b>Message:</b> " + err.Message + "<br /><br />";
            lblResult.Text += "<b>Source:</b> " + err.Source + "<br /><br />";
            lblResult.Text += "<b>Stack Trace:</b> " + err.StackTrace;
            lblResult.ForeColor = Color.Red;

            if (!EventLog.SourceExists("DivideByZeroApp"))
            {
                EventLog.CreateEventSource("DivideByZeroApp", "ProseTech");
            }
            EventLog log = new EventLog("ProseTech");
            log.Source = "DivideByZeroApp";
            log.WriteEntry(err.Message, EventLogEntryType.Error);
        }
    }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Development/Eventlog&oldid=2620»