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Enterprise Library Log de Exceptions

Antes de qualquer coisa devemos adicionarmos a DLL de log que se chama Microsoft.Practices.EnterpriseLibrary.Logging.dll em seu projeto, caso você não tenha essa DLL, instale o Enterprise Library 2.0, essa DLL fica dentro da pasta BIN onde o Enterprise Library  foi instalado, bastando adicionar em seu projeto.

No arquivo Web.Config setar.

<configSections>
<section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"/>
</configSections>

<loggingConfiguration name="Logging Application Block" tracingEnabled="true" defaultCategory="" logWarningsWhenNoCategoriesMatch="true">
<listeners>
<add fileName="Erros.log" header="---------" footer="---------" formatter="Text Formatter" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging,Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" traceOutputOptions="None" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging,Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" name="FlatFile TraceListener" />
</listeners>
<formatters>
<add template="Timestamp: {timestamp}&#xD;&#xA;Message: {message}&#xD;&#xA;Category: {category} &#xD;&#xA;Priority: {priority}" type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter,Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0,Culture=neutral, PublicKeyToken=null" name="Text Formatter" />
</formatters>
<specialSources>
<allEvents switchValue="All" name="All Events">
<listeners>
<add name="FlatFile TraceListener" />
</listeners>
</allEvents>
<notProcessed switchValue="All" name="Unprocessed Category" />
<errors switchValue="All" name="Logging Errors &amp; Warnings" />
</specialSources>
</loggingConfiguration>

No arquivo Global.aspx colocar o import e o código abaixo dentro de Application_Error

<%@ Import Namespace="Microsoft.Practices.EnterpriseLibrary.Logging" %>

void Application_Error(object sender, EventArgs e)
{
Exception ex = Server.GetLastError().GetBaseException();
string message = ex.Message +
"\nSOURCE: " + ex.Source +
"\nFORM: " + Request.Form.ToString() +
"\nQUERYSTRING: " + Request.QueryString.ToString() +
"\nTARGETSITE: " + ex.TargetSite +
"\nSTACKTRACE: " + ex.StackTrace;
Logger.Write(message);
}

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