ErrorHandlerModule.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / Mobile / ErrorHandlerModule.cs / 1305376 / ErrorHandlerModule.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.IO; 
using System.Web;
using System.Diagnostics; 
using System.Collections;
using System.Text;
using System.Security.Permissions;
using System.Globalization; 

namespace System.Web.Mobile 
{ 
    /*
     * Error Handler Module 
     * An Http Module that traps errors, and formats them for the appropriate
     * device.
     *
     * Copyright (c) 2000 Microsoft Corporation 
     */
 
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
    public class ErrorHandlerModule : IHttpModule
    {
        ///  
        /// 
        void IHttpModule.Init(HttpApplication application) 
        { 
//            application.BeginRequest += (new EventHandler(this.Application_BeginRequest));
            application.Error += (new EventHandler(this.Application_Error)); 
//            application.EndRequest += (new EventHandler(this.Application_EndRequest));
        }

/* obsolete 
        private void Application_BeginRequest(Object source, EventArgs e)
        { 
            HttpApplication application = (HttpApplication)source; 
            HttpContext context = application.Context;
            if (context != null) 
            {
                // Some device/gateway combination sends postdata's charset
                // in a separate header rather than in Content-Type.
                SetCharsetInRequestHeader(context); 
            }
        } 
 
        private void SetCharsetInRequestHeader(HttpContext context)
        { 
            String userAgent = context.Request.UserAgent;

            if (userAgent != null && CultureInfo.InvariantCulture.CompareInfo.IsPrefix(userAgent, "UP"))
            { 
                String postDataCharset = context.Request.Headers["x-up-devcap-post-charset"];
                if (postDataCharset != null && postDataCharset.Length > 0) 
                { 
                    try
                    { 
                        context.Request.ContentEncoding = Encoding.GetEncoding(postDataCharset);
                    }
                    catch
                    { 
                        // Exception may be thrown when charset is not valid.
                        // In this case, do nothing, and let the framework 
                        // use the configured RequestEncoding setting. 
                    }
                } 
            }
        }
*/
 
/* Obsolete
        private void Application_EndRequest(Object source, EventArgs e) 
        { 
            HttpApplication application = (HttpApplication)source;
            HttpContext context = application.Context; 
            if (context != null)
            {
                MobileRedirect.CheckForInvalidRedirection(context);
            } 
        }
*/ 
 

 
        private void Application_Error(Object source, EventArgs e)
        {
            HttpApplication application = (HttpApplication)source;
            HttpContext context = null; 
            bool useAdaptiveErrorReporting = false;
 
            try 
            {
                context = application.Context; 

                if(context.IsCustomErrorEnabled)
                {
                    return; 
                }
 
                Exception error = context.Server.GetLastError(); 

                if ((error == null) || (!RequiresAdaptiveErrorReporting(context, error))) 
                {
                    return;
                }
 
                useAdaptiveErrorReporting = true;
 
                MobileErrorInfo errorInfo = new MobileErrorInfo(error); 
                context.Items[MobileErrorInfo.ContextKey] = errorInfo;
 
                context.Response.Clear();
                IHttpHandler errorHandler = CreateErrorFormatter(context);
                errorHandler.ProcessRequest(context);
            } 
            catch(Exception e2)
            { 
                if (useAdaptiveErrorReporting && context != null) 
                {
                    // Failed to format error. Let it continue through 
                    // default processing.

                    context.Response.Write(e2.ToString());
                    context.Server.ClearError(); 
                    return;
                } 
                else 
                {
                    return; 
                }
            }

            context.Server.ClearError(); 
        }
 
        ///  
        /// 
        void IHttpModule.Dispose() 
        {
        }

 
        private bool RequiresAdaptiveErrorReporting(HttpContext context, Exception error)
        { 
            // Check if the error message is a non-500 error. 

            HttpException httpError = error as HttpException; 
            if (httpError != null && httpError.GetHttpCode() != 500)
            {
                return false;
            } 

            bool b; 
 
            // Checks whether custom error formatting is required for the
            // given device. 

            MobileCapabilities caps = context.Request.Browser as MobileCapabilities;
            if (caps == null)
            { 
                b = false;
            } 
            else if (caps.PreferredRenderingMime != "text/html") 
            {
                b = true; 
            }
            else
            {
                b = caps.RequiresHtmlAdaptiveErrorReporting; 
            }
            return b; 
        } 

        private IHttpHandler CreateErrorFormatter(HttpContext context) 
        {
            //

            return new System.Web.UI.MobileControls.ErrorFormatterPage(); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ErrorHandlerModule.cs source code in C# .NET

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