ServiceOperationHelpers.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / Workflow / Activities / ServiceOperationHelpers.cs / 1305376 / ServiceOperationHelpers.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Workflow.Activities 
{
    using System; 
    using System.Collections; 
    using System.Collections.Generic;
    using System.ComponentModel; 
    using System.Reflection;
    using System.Runtime;
    using System.ServiceModel;
    using System.ServiceModel.Description; 
    using System.Workflow.ComponentModel;
    using System.Workflow.ComponentModel.Compiler; 
 
    internal static class ServiceOperationHelpers
    { 
        public static string GetOperationName(IServiceProvider serviceProvider, MethodInfo methodInfo)
        {
            Fx.Assert((methodInfo != null), " MethoInfo cannot be null");
 
            string operationName = methodInfo.Name;
            object[] operationContractAttribs = methodInfo.GetCustomAttributes(typeof(OperationContractAttribute), true); 
            if (operationContractAttribs != null && operationContractAttribs.Length > 0) 
            {
                if (operationContractAttribs[0] is OperationContractAttribute) 
                {
                    OperationContractAttribute operationContractAttribute = operationContractAttribs[0] as OperationContractAttribute;
                    if (!String.IsNullOrEmpty(operationContractAttribute.Name))
                    { 
                        operationName = operationContractAttribute.Name;
                    } 
                } 
                if (operationContractAttribs[0] is AttributeInfoAttribute)
                { 
                    AttributeInfoAttribute attribInfoAttrib = operationContractAttribs[0] as AttributeInfoAttribute;
                    string propertyName = "Name";
                    string namePropertyValue;
                    if (TryGetArgumentValueAs(serviceProvider, attribInfoAttrib.AttributeInfo, propertyName, out namePropertyValue)) 
                    {
                        operationName = namePropertyValue; 
                    } 
                }
            } 
            return operationName;
        }

        public static PropertyDescriptor GetServiceOperationInfoPropertyDescriptor(Activity activity) 
        {
            if (activity is ReceiveActivity) 
            { 
                return TypeDescriptor.GetProperties(activity)[ReceiveActivity.ServiceOperationInfoProperty.Name];
            } 
            else
            {
                Fx.Assert(activity is SendActivity, " only Receive and Send activities are valid inputs to this method");
                return TypeDescriptor.GetProperties(activity)[SendActivity.ServiceOperationInfoProperty.Name]; 
            }
        } 
 
        public static bool IsAsyncOperation(IServiceProvider serviceProvider, MethodInfo methodInfo)
        { 
            if (serviceProvider == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("serviceProvider");
            } 

            if (methodInfo == null) 
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("methodInfo");
            } 

            bool isAsync = false;
            object[] operationContractAttribs = methodInfo.GetCustomAttributes(typeof(OperationContractAttribute), true);
            Fx.Assert(operationContractAttribs != null, "returned attribs list cannot be null"); 
            Fx.Assert(operationContractAttribs.Length > 0, "operation doesnt seem to be a valid operationcontract");
 
            if (operationContractAttribs[0] is OperationContractAttribute) 
            {
                OperationContractAttribute operationContractAttribute = operationContractAttribs[0] as OperationContractAttribute; 
                isAsync = operationContractAttribute.AsyncPattern;
            }
            if (operationContractAttribs[0] is AttributeInfoAttribute)
            { 
                AttributeInfoAttribute attribInfoAttrib = operationContractAttribs[0] as AttributeInfoAttribute;
                isAsync = GetOperationAsyncPattern(serviceProvider, attribInfoAttrib.AttributeInfo); 
            } 

            return isAsync; 
        }

        public static bool IsInitiatingOperation(IServiceProvider serviceProvider, MethodInfo methodInfo)
        { 
            if (serviceProvider == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("serviceProvider"); 
            }
 
            if (methodInfo == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("methodInfo");
            } 

            bool isInitiating = true; 
            object[] operationContractAttribs = methodInfo.GetCustomAttributes(typeof(OperationContractAttribute), true); 
            Fx.Assert(operationContractAttribs != null, "returned attribs list cannot be null");
            Fx.Assert(operationContractAttribs.Length > 0, "operation doesnt seem to be a valid operationcontract"); 

            if (operationContractAttribs[0] is OperationContractAttribute)
            {
                OperationContractAttribute operationContractAttribute = operationContractAttribs[0] as OperationContractAttribute; 
                isInitiating = operationContractAttribute.IsInitiating;
            } 
            if (operationContractAttribs[0] is AttributeInfoAttribute) 
            {
                AttributeInfoAttribute attribInfoAttrib = operationContractAttribs[0] as AttributeInfoAttribute; 
                isInitiating = IsInitiatingOperationContract(serviceProvider, attribInfoAttrib.AttributeInfo);
            }

            return isInitiating; 
        }
 
        public static bool IsNullableType(Type type) 
        {
            return (Nullable.GetUnderlyingType(type.IsByRef ? type.GetElementType() : type) != null); 
        }

        public static bool IsValidServiceContract(Type contractType)
        { 
            if (contractType == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractType"); 
            }
 
            object[] contractAttribs = contractType.GetCustomAttributes(typeof(ServiceContractAttribute), false);
            if (contractAttribs != null && contractAttribs.Length > 0)
            {
                if (contractAttribs[0] is ServiceContractAttribute) 
                {
                    return true; 
                } 
                if (contractAttribs[0] is AttributeInfoAttribute)
                { 
                    AttributeInfoAttribute attribInfoAttrib = contractAttribs[0] as AttributeInfoAttribute;
                    if (typeof(ServiceContractAttribute).IsAssignableFrom(attribInfoAttrib.AttributeInfo.AttributeType))
                    {
                        return true; 
                    }
                } 
            } 
            return false;
        } 

        public static bool IsValidServiceOperation(MethodInfo methodInfo)
        {
            if (methodInfo == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("methodInfo"); 
            } 

            object[] operationContractAttribs = methodInfo.GetCustomAttributes(typeof(OperationContractAttribute), true); 
            if (operationContractAttribs != null && operationContractAttribs.Length > 0)
            {
                if (operationContractAttribs[0] is OperationContractAttribute)
                { 
                    return true;
                } 
                if (operationContractAttribs[0] is AttributeInfoAttribute) 
                {
                    AttributeInfoAttribute attribInfoAttrib = operationContractAttribs[0] as AttributeInfoAttribute; 
                    if (typeof(OperationContractAttribute).IsAssignableFrom(attribInfoAttrib.AttributeInfo.AttributeType))
                    {
                        return true;
                    } 
                }
            } 
            return false; 
        }
 
        internal static List GetContracts(Type contractType)
        {
            List types = new List();
            if (contractType.IsDefined(typeof(ServiceContractAttribute), false)) 
            {
                types.Add(contractType); 
            } 
            foreach (Type contract in contractType.GetInterfaces())
            { 
                if (contract.IsDefined(typeof(ServiceContractAttribute), false))
                {
                    types.Add(contract);
                } 
            }
 
            return types; 
        }
 
        internal static SessionMode GetContractSessionMode(IServiceProvider serviceProvider, AttributeInfo attribInfo)
        {
            string propertyName = "SessionMode";
            SessionMode sessionMode = SessionMode.Allowed; 
            if (!TryGetArgumentValueAs(serviceProvider, attribInfo, propertyName, out sessionMode))
            { 
                sessionMode = SessionMode.Allowed; 
            }
            return sessionMode; 
        }

        internal static object[] GetCustomAttributes(Type attributeType, Attribute[] attributes)
        { 
            if (attributeType == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("attributeType"); 
            }
 
            ArrayList attributeList = new ArrayList();

            foreach (Attribute currentAttribute in attributes)
            { 
                if (attributeType.IsAssignableFrom(currentAttribute.GetType()))
                { 
                    attributeList.Add(currentAttribute); 
                }
            } 

            return attributeList.ToArray();
        }
 
        internal static bool GetOperationAsyncPattern(IServiceProvider serviceProvider, AttributeInfo attribInfo)
        { 
            string propertyName = "AsyncPattern"; 
            bool isAsync = false;
            if (!TryGetArgumentValueAs(serviceProvider, attribInfo, propertyName, out isAsync)) 
            {
                isAsync = false;
            }
            return isAsync; 
        }
 
        internal static bool IsDefined(Type attributeType, 
            Attribute[] attributes)
        { 
            if (attributeType == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("attributeType");
            } 

            foreach (Attribute attribute in attributes) 
            { 
                if (attributeType.IsAssignableFrom(attribute.GetType()))
                { 
                    return true;
                }
            }
 
            return false;
        } 
 
        internal static bool IsInitiatingOperationContract(IServiceProvider serviceProvider, AttributeInfo attribInfo)
        { 
            string propertyName = "IsInitiating";
            bool isInitiating = true;
            if (!TryGetArgumentValueAs(serviceProvider, attribInfo, propertyName, out isInitiating))
            { 
                isInitiating = true;
            } 
            return isInitiating; 
        }
 
        internal static void SetWorkflowOperationBehavior(ContractDescription contractDescription, ServiceDescriptionContext context)
        {
            if (contractDescription == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractDescription");
            } 
 
            if (context == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("context");
            }

            foreach (OperationDescription opDescription in contractDescription.Operations) 
            {
                WorkflowOperationBehavior behavior = null; 
                KeyValuePair operationKey = 
                    new KeyValuePair(opDescription.DeclaringContract.ContractType, opDescription.Name);
 
                if (!context.WorkflowOperationBehaviors.TryGetValue(operationKey, out behavior))
                {
                    behavior = new WorkflowOperationBehavior();
                    context.WorkflowOperationBehaviors.Add(operationKey, behavior); 
                    behavior.CanCreateInstance = false;
                } 
 
                if (opDescription.Behaviors.Find() != behavior)
                { 
                    opDescription.Behaviors.Remove(typeof(WorkflowOperationBehavior));
                    opDescription.Behaviors.Add(behavior);
                }
            } 
        }
 
        private static string[] GetAttributePropertyNames(AttributeInfo attributeInfo) 
        {
            if (attributeInfo == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("attributeInfo");
            }
 
            string[] argumentNames = null;
            BindingFlags bindingFlags = BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.NonPublic; 
            FieldInfo argumentNamesField = typeof(AttributeInfo).GetField("argumentNames", bindingFlags); 
            if (argumentNamesField != null)
            { 
                argumentNames = argumentNamesField.GetValue(attributeInfo) as string[];
            }

            return argumentNames; 
        }
 
 
        private static bool TryGetArgumentValueAs(IServiceProvider serviceProvider, AttributeInfo attribInfo, string propertyName, out T propertyValue)
        { 
            string[] argumentNames = GetAttributePropertyNames(attribInfo);
            int argumentIndex = -1;
            for (int index = 0; index < argumentNames.Length; index++)
            { 
                // skip unnamed arguments these are constructor arguments
                if (string.IsNullOrEmpty((argumentNames[index]))) 
                { 
                    continue;
                } 
                else
                {
                    if (argumentNames[index].Equals(propertyName))
                    { 
                        argumentIndex = index;
                        break; 
                    } 
                }
            } 
            if (argumentIndex == -1)
            {
                propertyValue = default(T);
                return false; 
            }
            propertyValue = (T) attribInfo.GetArgumentValueAs(serviceProvider, argumentIndex, typeof(T)); 
            return true; 
        }
    } 
}

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

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