DynamicContractTypeBuilder.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / Workflow / Activities / DynamicContractTypeBuilder.cs / 1305376 / DynamicContractTypeBuilder.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.Diagnostics.CodeAnalysis;
    using System.Drawing.Design;
    using System.Net.Security;
    using System.Reflection; 
    using System.Reflection.Emit;
    using System.ServiceModel; 
    using System.Threading; 
    using System.Workflow.Activities.Design;
    using System.Workflow.ComponentModel; 
    using System.Workflow.ComponentModel.Compiler;

    internal static class DynamicContractTypeBuilder
    { 
        internal static readonly DependencyProperty DynamicContractTypesProperty =
            DependencyProperty.RegisterAttached("DynamicContractTypes", 
            typeof(Dictionary), typeof(DynamicContractTypeBuilder), 
            new PropertyMetadata(null, DependencyPropertyOptions.NonSerialized));
 
        public static Type GetContractType(OperationInfo operationInfo, ReceiveActivity contextActivity)
        {
            if (operationInfo == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("operationInfo");
            } 
 
            if (contextActivity == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contextActivity");
            }

            if (string.IsNullOrEmpty(operationInfo.ContractName)) 
            {
                return null; 
            } 

            Activity rootActivity = contextActivity.RootActivity; 
            Dictionary contractTypes =
                rootActivity.GetValue(DynamicContractTypeBuilder.DynamicContractTypesProperty) as Dictionary;

            if (contractTypes == null) 
            {
                Activity definition = rootActivity.GetValue(Activity.WorkflowDefinitionProperty) as Activity; 
                if (definition != null) 
                {
                    contractTypes = definition.GetValue(DynamicContractTypeBuilder.DynamicContractTypesProperty) as Dictionary; 
                }

                if (contractTypes != null)
                { 
                    rootActivity.SetValue(DynamicContractTypeBuilder.DynamicContractTypesProperty, contractTypes);
                } 
            } 

            if (contractTypes == null) 
            {
                contractTypes = BuildContractTypes(rootActivity);
                rootActivity.SetValue(DynamicContractTypeBuilder.DynamicContractTypesProperty, contractTypes);
            } 

            if (contractTypes.ContainsKey(operationInfo.ContractName)) 
            { 
                return contractTypes[operationInfo.ContractName];
            } 

            return null;
        }
 
        static Dictionary BuildContractTypes(Activity contextActivity)
        { 
            if (contextActivity == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contextActivity"); 
            }

            Dictionary types = new Dictionary();
 
            Walker walker = new Walker(true);
            walker.FoundActivity += delegate(Walker w, WalkerEventArgs args) 
            { 
                ReceiveActivity currentActivity = args.CurrentActivity as ReceiveActivity;
                if (currentActivity == null) 
                {
                    return;
                }
                OperationInfo operationInfo = currentActivity.ServiceOperationInfo as OperationInfo; 
                if (operationInfo == null)
                { 
                    return; 
                }
 
                if (string.IsNullOrEmpty(operationInfo.ContractName) ||
                    string.IsNullOrEmpty(operationInfo.Name))
                {
                    return; 
                }
 
                if (!types.ContainsKey(operationInfo.ContractName)) 
                {
                    types.Add(operationInfo.ContractName, 
                        new ContractType(operationInfo.ContractName));
                }

                bool hasReturnValue = false; 
                bool duplicatedPositions = false;
                int maxPosition = -1; 
                List parameterIndexs = new List(); 

                foreach (OperationParameterInfo operationParameterInfo in operationInfo.Parameters) 
                {
                    if (operationParameterInfo.Position == -1)
                    {
                        hasReturnValue = true; 
                    }
                    else 
                    { 
                        maxPosition = (maxPosition < operationParameterInfo.Position) ? operationParameterInfo.Position : maxPosition;
                    } 

                    if (parameterIndexs.Contains(operationParameterInfo.Position))
                    {
                        duplicatedPositions = true; 
                        break;
                    } 
                    else 
                    {
                        parameterIndexs.Add(operationParameterInfo.Position); 
                    }
                }

                if (duplicatedPositions || 
                    maxPosition > (operationInfo.Parameters.Count - (hasReturnValue ? 2 : 1)))
                { 
                    return; 
                }
 
                ContractType contract = types[operationInfo.ContractName];
                ContractMethodInfo methodInfo = new ContractMethodInfo(contract, operationInfo);
            };
 
            walker.Walk(contextActivity);
 
            return types; 
        }
    } 
}

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

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