C# IDictionary.EmitStringMessage方法代码示例

        // Accept, Accept-Encoding flow
        internal IContentFormatter NegotiateFormat(IDictionary<string, object> environment, string ext, ILightNodeOptions options, IOperationCoordinator coorinator)
        {
            var requestHeader = environment["owin.RequestHeaders"] as IDictionary<string, string[]>;

            string[] accepts;
            if (ForceUseFormatter != null) return ForceUseFormatter;
            if (!string.IsNullOrWhiteSpace(ext))
            {
                // Ext match -> ContentEncoding match
                var selectedFormatters = formatterByExt[ext] as ICollection<IContentFormatter> ?? formatterByExt[ext].ToArray();
                if (!selectedFormatters.Any())
                {
                    coorinator.OnProcessInterrupt(options, environment, InterruptReason.NegotiateFormatFailed, "Ext:" + ext);
                    options.Logger.NegotiateFormatFailed(OperationMissingKind.NegotiateFormatFailed, ext);
                    if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
                    {
                        throw new NegotiateFormatFailedException(OperationMissingKind.NegotiateFormatFailed, ext);
                    }
                    else
                    {
                        environment.EmitNotAcceptable();
                        if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
                        {
                            environment.EmitStringMessage("NegotiateFormat failed, ext:" + ext);
                        }
                    }
                    return null;
                }

                return SelectAcceptEncodingFormatter(requestHeader, selectedFormatters);
            }
            else if (requestHeader.TryGetValue("Accept", out accepts))
            {
                if (optionFormatters.Length == 1) return options.DefaultFormatter; // optimize path, defaultFormatter only

                // MediaType match -> ContentEncoding match
                var acceptsValues = GetDescendingQualityHeaderValues(accepts);
                var formatters = acceptsValues.SelectMany(x => formatterByMediaType[x.Item3]).ToArray();

                if (formatters.Length == 0)
                {
                    // only accept-encoding
                    goto CONTENT_ENCODING_MATCH;
                }

                return SelectAcceptEncodingFormatter(requestHeader, formatters);
            }

            // ContentEncoding match
            CONTENT_ENCODING_MATCH:
            {
                if (optionFormatters.Length == 1) return options.DefaultFormatter; // optimize path, defaultFormatter only

                // ContentEncoding match
                string[] rawAcceptEncoding;
                if (!requestHeader.TryGetValue("Accept-Encoding", out rawAcceptEncoding))
                {
                    return options.DefaultFormatter;
                }

                var acceptEncodings = GetDescendingQualityHeaderValues(rawAcceptEncoding);
                var formatter = acceptEncodings
                    .Select(kvp => formatterByContentEncoding[kvp.Item3].FirstOrDefault())
                    .FirstOrDefault(x => x != null);

                if (formatter == null) return options.DefaultFormatter;
                return formatter;
            }
        }

        internal static object[] BindParameter(IDictionary<string, object> environment, ILightNodeOptions options, IOperationCoordinator coordinator, ValueProvider valueProvider, ParameterInfoSlim[] arguments)
        {
            var methodParameters = new object[arguments.Length];
            for (int i = 0; i < arguments.Length; i++)
            {
                var item = arguments[i];

                var _values = valueProvider.GetValue(item.Name);
                var value = _values as string;
                var values = _values as List<string>;
                var isEmpty = _values == null;
                var byteArray = _values as byte[];

                // TODO:Experimental support
                if (byteArray != null && item.ParameterTypeIsArray && item.ParameterType == typeof(byte[]))
                {
                    methodParameters[i] = byteArray;
                    continue;
                }

                if (isEmpty && !item.ParameterTypeIsArray)
                {
                    if (item.IsOptional)
                    {
                        methodParameters[i] = item.DefaultValue;
                        continue;
                    }
                    else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
                    {
                        methodParameters[i] = null;
                        continue;
                    }
                    else
                    {
                        coordinator.OnProcessInterrupt(options, environment, InterruptReason.ParameterBindMissing, "Lack of Parameter:" + item.Name);
                        options.Logger.ParameterBindMissing(OperationMissingKind.LackOfParameter, item.Name);
                        if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
                        {
                            throw new ParameterMissingException(OperationMissingKind.LackOfParameter, item.Name);
                        }
                        else
                        {
                            environment.EmitBadRequest();
                            if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
                            {
                                environment.EmitStringMessage("Lack of Parameter:" + item.Name);
                            }
                            return null;
                        }
                    }
                }
                else if (!item.ParameterTypeIsArray)
                {
                    var conv = TypeBinder.GetConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
                    if (conv == null) throw new InvalidOperationException("critical:register code is broken");

                    object pValue;
                    if (conv(value ?? values[0], out pValue))
                    {
                        methodParameters[i] = pValue;
                        continue;
                    }
                    else if (item.IsOptional)
                    {
                        methodParameters[i] = item.DefaultValue;
                        continue;
                    }
                    else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
                    {
                        methodParameters[i] = null;
                        continue;
                    }
                    else
                    {
                        coordinator.OnProcessInterrupt(options, environment, InterruptReason.ParameterBindMissing, "Mismatch ParameterType:" + item.Name);
                        options.Logger.ParameterBindMissing(OperationMissingKind.MissmatchParameterType, item.Name);
                        if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
                        {
                            throw new ParameterMissingException(OperationMissingKind.MissmatchParameterType, item.Name);
                        }
                        else
                        {
                            environment.EmitBadRequest();
                            if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
                            {
                                environment.EmitStringMessage("Mismatch ParameterType:" + item.Name);
                            }
                            return null;
                        }
                    }
                }

                var arrayConv = TypeBinder.GetArrayConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
                if (arrayConv == null) throw new InvalidOperationException("critical:register code is broken");

                methodParameters[i] = arrayConv((values != null) ? values : (value != null) ? new[] { value } : (IList<string>)new string[0]);
                continue;
            }

            return methodParameters;
//.........这里部分代码省略.........

 private static bool IsRethrowOrEmitException(IIMOwinOptions options, IDictionary<string, object> environment, Exception ex)
 {
     var exString = ex.ToString();
     switch (options.ErrorHandlingPolicy)
     {
         case ErrorHandlingPolicy.ParseReturnStatusCodeException:
             environment.ParseReturnStatusCodeException(ex);
             return false;
         case ErrorHandlingPolicy.ReturnInternalServerError:
             environment.EmitInternalServerError();
             environment.EmitStringMessage("500 InternalServerError");
             return false;
         case ErrorHandlingPolicy.ReturnInternalServerErrorIncludeErrorDetails:
             environment.EmitInternalServerError();
             environment.EmitStringMessage(exString);
             return false;
         default:
             environment.EmitInternalServerError();
             return true;
     }
 }

        OperationHandler SelectHandler(IDictionary<string, object> environment, IOperationCoordinator coorinator, out AcceptVerbs verb, out string ext)
        {
            // out default
            verb = AcceptVerbs.Get;
            ext = "";
            var path = environment["owin.RequestPath"] as string;
            var method = environment["owin.RequestMethod"] as string;

            // extract path
            var keyBase = path.Trim('/').Split('/');
            if (keyBase.Length != 2)
            {
                goto NOT_FOUND;
            }

            // extract "extension" for media type
            var extStart = keyBase[1].LastIndexOf(".");
            if (extStart != -1)
            {
                ext = keyBase[1].Substring(extStart + 1);
                keyBase[1] = keyBase[1].Substring(0, keyBase[1].Length - ext.Length - 1);
            }

            // {ClassName, MethodName}
            var key = new RequestPath(keyBase[0], keyBase[1]);

            OperationHandler handler;
            if (handlers.TryGetValue(key, out handler))
            {
                // verb check
                if (StringComparer.OrdinalIgnoreCase.Equals(method, "GET"))
                {
                    verb = AcceptVerbs.Get;
                }
                else if (StringComparer.OrdinalIgnoreCase.Equals(method, "POST"))
                {
                    verb = AcceptVerbs.Post;
                }
                else if (StringComparer.OrdinalIgnoreCase.Equals(method, "PUT"))
                {
                    verb = AcceptVerbs.Put;
                }
                else if (StringComparer.OrdinalIgnoreCase.Equals(method, "DELETE"))
                {
                    verb = AcceptVerbs.Delete;
                }
                else if (StringComparer.OrdinalIgnoreCase.Equals(method, "PATCH"))
                {
                    verb = AcceptVerbs.Patch;
                }
                else
                {
                    goto VERB_MISSING;
                }

                if (!handler.AcceptVerb.HasFlag(verb))
                {
                    goto VERB_MISSING;
                }

                return handler; // OK
            }
            else
            {
                goto NOT_FOUND;
            }

            VERB_MISSING:
            coorinator.OnProcessInterrupt(options, environment, InterruptReason.MethodNotAllowed, "MethodName:" + method);
            options.Logger.MethodNotAllowed(OperationMissingKind.MethodNotAllowed, path, method);
            if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
            {
                throw new MethodNotAllowedException(OperationMissingKind.MethodNotAllowed, path, method);
            }
            else
            {
                environment.EmitMethodNotAllowed();
                if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
                {
                    environment.EmitStringMessage("MethodNotAllowed:" + method);
                }
                return null;
            }

            NOT_FOUND:
            coorinator.OnProcessInterrupt(options, environment, InterruptReason.OperationNotFound, "SearchedPath:" + path);
            options.Logger.OperationNotFound(OperationMissingKind.OperationNotFound, path);
            if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
            {
                throw new OperationNotFoundException(OperationMissingKind.MethodNotAllowed, path);
            }
            else
            {
                environment.EmitNotFound();
                if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
                {
                    environment.EmitStringMessage("OperationNotFound:" + path);
                }
                return null;
            }
//.........这里部分代码省略.........

 static bool IsRethrowOrEmitException(IOperationCoordinator coordinator, ILightNodeOptions options, IDictionary<string, object> environment, Exception ex)
 {
     var exString = ex.ToString();
     coordinator.OnProcessInterrupt(options, environment, InterruptReason.ExecuteFailed, exString);
     switch (options.ErrorHandlingPolicy)
     {
         case ErrorHandlingPolicy.ReturnInternalServerError:
             environment.EmitInternalServerError();
             environment.EmitStringMessage("500 InternalServerError");
             return false;
         case ErrorHandlingPolicy.ReturnInternalServerErrorIncludeErrorDetails:
             environment.EmitInternalServerError();
             environment.EmitStringMessage(exString);
             return false;
         case ErrorHandlingPolicy.ThrowException:
         default:
             environment.EmitInternalServerError();
             return true;
     }
 }

        // Routing -> ParameterBinding -> Execute
        public async Task ProcessRequest(IDictionary<string, object> environment)
        {
            try
            {
                AcceptVerbs verb;
                string ext;
                var handler = SelectHandler(environment, out verb, out ext);
                if (handler == null) return;

                // verb check | TODO:check operation verb attribute
                if (!options.DefaultAcceptVerb.HasFlag(verb))
                {
                    environment.EmitMethodNotAllowed();
                    return;
                }

                // Parameter binding
                var valueProvider = new ValueProvider(environment, verb);
                var methodParameters = ParameterBinder.BindParameter(environment, options, valueProvider, handler.Arguments);
                if (methodParameters == null) return;

                // select formatter
                var formatter = NegotiateFormat(environment, ext);
                if (formatter == null) return;

                // Operation execute
                var context = new OperationContext(environment, handler.ClassName, handler.MethodName, verb)
                {
                    Parameters = methodParameters,
                    ContentFormatter = formatter,
                    Attributes = handler.AttributeLookup
                };
                await handler.Execute(options, context).ConfigureAwait(false);
                return;
            }
            catch (ReturnStatusCodeException statusException)
            {
                statusException.EmitCode(environment);
                return;
            }
            catch (Exception ex)
            {
                switch (options.ErrorHandlingPolicy)
                {
                    case ErrorHandlingPolicy.ReturnInternalServerError:
                        environment.EmitInternalServerError();
                        return;
                    case ErrorHandlingPolicy.ReturnInternalServerErrorIncludeErrorDetails:
                        environment.EmitInternalServerError();
                        environment.EmitStringMessage(ex.ToString());
                        return;
                    case ErrorHandlingPolicy.ThrowException:
                    default:
                        throw;
                }
            }
        }

        internal static object[] BindParameter(IDictionary<string, object> environment, LightNodeOptions options, ValueProvider valueProvider, ParameterInfoSlim[] arguments)
        {
            var methodParameters = new object[arguments.Length];
            for (int i = 0; i < arguments.Length; i++)
            {
                var item = arguments[i];

                var _values = valueProvider.GetValue(item.Name);
                var value = _values as string;
                var values = _values as List<string>;
                var isEmpty = _values == null;

                if (isEmpty && !item.ParameterTypeIsArray)
                {
                    if (item.IsOptional)
                    {
                        methodParameters[i] = item.DefaultValue;
                        continue;
                    }
                    else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
                    {
                        methodParameters[i] = null;
                        continue;
                    }
                    else
                    {
                        environment.EmitBadRequest();
                        environment.EmitStringMessage("Lack of Parameter:" + item.Name);
                        return null;
                    }
                }
                else if (!item.ParameterTypeIsArray)
                {
                    var conv = TypeBinder.GetConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
                    if (conv == null) throw new InvalidOperationException("critical:register code is broken");

                    object pValue;
                    if (conv(value ?? values[0], out pValue))
                    {
                        methodParameters[i] = pValue;
                        continue;
                    }
                    else if (item.IsOptional)
                    {
                        methodParameters[i] = item.DefaultValue;
                        continue;
                    }
                    else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
                    {
                        methodParameters[i] = null;
                        continue;
                    }
                    else
                    {
                        environment.EmitBadRequest();
                        environment.EmitStringMessage("Mismatch Parameter Type:" + item.Name);
                        return null;
                    }
                }

                var arrayConv = TypeBinder.GetArrayConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
                if (arrayConv == null) throw new InvalidOperationException("critical:register code is broken");

                methodParameters[i] = arrayConv((values != null) ? values : (value != null) ? new[] { value } : Enumerable.Empty<string>());
                continue;
            }

            return methodParameters;
        }