WebErrorHandler.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.ServiceModel.Web / System / ServiceModel / Dispatcher / WebErrorHandler.cs / 1407647 / WebErrorHandler.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
#pragma warning disable 1634, 1691
namespace System.ServiceModel.Dispatcher 
{
    using System; 
    using System.Diagnostics; 
    using System.Net;
    using System.Runtime; 
    using System.Runtime.Serialization;
    using System.Runtime.Serialization.Json;
    using System.ServiceModel;
    using System.ServiceModel.Channels; 
    using System.ServiceModel.Description;
    using System.ServiceModel.Syndication; 
    using System.ServiceModel.Web; 
    using System.Xml.Linq;
    using System.Xml.Serialization; 
    using System.ServiceModel.Diagnostics;

    class WebErrorHandler : IErrorHandler
    { 
        WebHttpBehavior webHttpBehavior;
        ContractDescription contractDescription; 
        bool includeExceptionDetailInFaults; 

        public WebErrorHandler(WebHttpBehavior webHttpBehavior, ContractDescription contractDescription, bool includeExceptionDetailInFaults) 
        {
            this.webHttpBehavior = webHttpBehavior;
            this.contractDescription = contractDescription;
            this.includeExceptionDetailInFaults = includeExceptionDetailInFaults; 
        }
 
        public bool HandleError(Exception error) 
        {
            return false; 
        }

        public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
        { 
            if (version != MessageVersion.None || error == null)
            { 
                return; 
            }
 
            // If the exception is not derived from FaultException and the fault message is already present
            //   then only another error handler could have provided the fault so we should not replace it
            FaultException errorAsFaultException = error as FaultException;
            if (errorAsFaultException == null && fault != null) 
            {
                return; 
            } 

            try 
            {
                if (error is IWebFaultException)
                {
                    IWebFaultException webFaultException = (IWebFaultException)error; 
                    WebOperationContext context = WebOperationContext.Current;
                    context.OutgoingResponse.StatusCode = webFaultException.StatusCode; 
                    string operationName; 
                    if (OperationContext.Current.IncomingMessageProperties.TryGetValue(WebHttpDispatchOperationSelector.HttpOperationNamePropertyName, out operationName))
                    { 
                        OperationDescription description = this.contractDescription.Operations.Find(operationName);
                        bool isXmlSerializerFaultFormat = WebHttpBehavior.IsXmlSerializerFaultFormat(description);
                        if (isXmlSerializerFaultFormat && WebOperationContext.Current.OutgoingResponse.Format == WebMessageFormat.Json)
                        { 
                            throw System.ServiceModel.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.JsonFormatRequiresDataContract, description.Name, description.DeclaringContract.Name, description.DeclaringContract.Namespace)));
                        } 
                        WebMessageFormat? nullableFormat = !isXmlSerializerFaultFormat ? context.OutgoingResponse.Format : WebMessageFormat.Xml; 
                        WebMessageFormat format = nullableFormat.HasValue ? nullableFormat.Value : this.webHttpBehavior.GetResponseFormat(description);
                        if (webFaultException.DetailObject != null) 
                        {
                            switch (format)
                            {
                                case WebMessageFormat.Json: 
                                    fault = context.CreateJsonResponse(webFaultException.DetailObject, new DataContractJsonSerializer(webFaultException.DetailType,  webFaultException.KnownTypes));
                                    break; 
                                case WebMessageFormat.Xml: 
                                    if (isXmlSerializerFaultFormat)
                                    { 
                                        fault = context.CreateXmlResponse(webFaultException.DetailObject, new XmlSerializer(webFaultException.DetailType, webFaultException.KnownTypes));
                                    }
                                    else
                                    { 
                                        fault = context.CreateXmlResponse(webFaultException.DetailObject, new DataContractSerializer(webFaultException.DetailType, webFaultException.KnownTypes));
                                    } 
                                    break; 
                            }
                        } 
                        else
                        {
                            HttpResponseMessageProperty property;
                            if (OperationContext.Current.OutgoingMessageProperties.TryGetValue(HttpResponseMessageProperty.Name, out property) && 
                                property != null)
                            { 
                                property.SuppressEntityBody = true; 
                            }
                            if (format == WebMessageFormat.Json) 
                            {
                                fault.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.JsonProperty);
                            }
                        } 
                    }
                    else 
                    { 
                        throw System.ServiceModel.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.OperationNameNotFound));
                    } 
                }
                else
                {
                    fault = CreateHtmlResponse(error); 
                }
 
            } 
            catch (Exception ex)
            { 
                if (Fx.IsFatal(ex))
                {
                    throw;
                } 
                if (System.ServiceModel.DiagnosticUtility.ShouldTraceWarning)
                { 
                    System.ServiceModel.DiagnosticUtility.ExceptionUtility.TraceHandledException(new InvalidOperationException(SR2.GetString(SR2.HelpPageFailedToCreateErrorMessage)), TraceEventType.Warning); 
                }
 
                WebOperationContext.Current.OutgoingResponse.StatusCode = HttpStatusCode.BadRequest;
                fault = CreateHtmlResponse(ex);
            }
        } 

        Message CreateHtmlResponse(Exception error) 
        { 
            // Note: WebOperationContext may not be present in case of an invalid HTTP request
            Uri helpUri = null; 
            if (WebOperationContext.Current != null)
            {
                helpUri = this.webHttpBehavior.HelpUri != null ? UriTemplate.RewriteUri(this.webHttpBehavior.HelpUri, WebOperationContext.Current.IncomingRequest.Headers[HttpRequestHeader.Host]) : null;
            } 
            StreamBodyWriter bodyWriter;
            if (this.includeExceptionDetailInFaults) 
            { 
                bodyWriter = StreamBodyWriter.CreateStreamBodyWriter(s => HelpHtmlBuilder.CreateServerErrorPage(helpUri, error).Save(s, SaveOptions.OmitDuplicateNamespaces));
            } 
            else
            {
                bodyWriter = StreamBodyWriter.CreateStreamBodyWriter(s => HelpHtmlBuilder.CreateServerErrorPage(helpUri, null).Save(s, SaveOptions.OmitDuplicateNamespaces));
            } 
            Message response = new HttpStreamMessage(bodyWriter);
            response.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.RawProperty); 
 
            HttpResponseMessageProperty responseProperty = GetResponseProperty(WebOperationContext.Current, response);
            if (!responseProperty.HasStatusCodeBeenSet) 
            {
                responseProperty.StatusCode = HttpStatusCode.BadRequest;
            }
            responseProperty.Headers[HttpResponseHeader.ContentType] = Atom10Constants.HtmlMediaType; 
            return response;
        } 
 
        static HttpResponseMessageProperty GetResponseProperty(WebOperationContext currentContext, Message response)
        { 
            HttpResponseMessageProperty responseProperty;
            if (currentContext != null)
            {
                responseProperty = currentContext.OutgoingResponse.MessageProperty; 
            }
            else 
            { 
                responseProperty = new HttpResponseMessageProperty();
                response.Properties.Add(HttpResponseMessageProperty.Name, responseProperty); 
            }
            return responseProperty;
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
WebErrorHandler.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
