InvokeMethod.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Statements / InvokeMethod.cs / 1305376 / InvokeMethod.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities.Statements 
{
    using System.Activities.Validation; 
    using System.Collections.Generic; 
    using System.Collections.ObjectModel;
    using System.ComponentModel; 
    using System.Runtime.Collections;
    using System.Windows.Markup;
    using System.Runtime;
 
    [ContentProperty("Parameters")]
    public sealed class InvokeMethod : AsyncCodeActivity 
    { 
        Collection parameters;
        Collection genericTypeArguments; 

        MethodResolver methodResolver;
        MethodExecutor methodExecutor;
        RuntimeArgument resultArgument; 

        public InvokeMethod() 
            : base() 
        {
        } 

        public Collection GenericTypeArguments
        {
            get 
            {
                if (this.genericTypeArguments == null) 
                { 
                    this.genericTypeArguments = new ValidatingCollection
                    { 
                        // disallow null values
                        OnAddValidationCallback = item =>
                        {
                            if (item == null) 
                            {
                                throw FxTrace.Exception.ArgumentNull("item"); 
                            } 
                        }
                    }; 
                }
                return this.genericTypeArguments;
            }
        } 

        public string MethodName 
        { 
            get;
            set; 
        }

        public Collection Parameters
        { 
            get
            { 
                if (this.parameters == null) 
                {
                    this.parameters = new ValidatingCollection 
                    {
                        // disallow null values
                        OnAddValidationCallback = item =>
                        { 
                            if (item == null)
                            { 
                                throw FxTrace.Exception.ArgumentNull("item"); 
                            }
                        } 
                    };
                }
                return this.parameters;
            } 
        }
 
        [DefaultValue(null)] 
        public OutArgument Result
        { 
            get;
            set;
        }
 
        [DefaultValue(null)]
        public InArgument TargetObject 
        { 
            get;
            set; 
        }

        [DefaultValue(null)]
        public Type TargetType 
        {
            get; 
            set; 
        }
 
        [DefaultValue(false)]
        public bool RunAsynchronously
        {
            get; 
            set;
        } 
 

        protected override void CacheMetadata(CodeActivityMetadata metadata) 
        {
            Collection arguments = new Collection();

            Type targetObjectType = TypeHelper.ObjectType; 

            if (this.TargetObject != null) 
            { 
                targetObjectType = this.TargetObject.ArgumentType;
            } 

            RuntimeArgument targetObjectArgument = new RuntimeArgument("TargetObject", targetObjectType, ArgumentDirection.In);
            metadata.Bind(this.TargetObject, targetObjectArgument);
            arguments.Add(targetObjectArgument); 

            Type resultType = TypeHelper.ObjectType; 
 
            if (this.Result != null)
            { 
                resultType = this.Result.ArgumentType;
            }

            this.resultArgument = new RuntimeArgument("Result", resultType, ArgumentDirection.Out); 
            metadata.Bind(this.Result, this.resultArgument);
            arguments.Add(resultArgument); 
 
            // Parameters are named according to MethodInfo name if DetermineMethodInfo
            // succeeds, otherwise arbitrary names are used. 
            this.methodResolver = CreateMethodResolver();
            this.methodResolver.DetermineMethodInfo(metadata, out this.methodExecutor);
            this.methodResolver.RegisterParameters(arguments);
 
            metadata.SetArgumentsCollection(arguments);
 
            this.methodResolver.Trace(); 

            if (this.methodExecutor != null) 
            {
                this.methodExecutor.Trace(this);
            }
        } 

 
        protected override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state) 
        {
            return this.methodExecutor.BeginExecuteMethod(context, callback, state); 
        }

        protected override void EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
        { 
            this.methodExecutor.EndExecuteMethod(context, result);
        } 
 
        MethodResolver CreateMethodResolver()
        { 
            MethodResolver resolver = new MethodResolver
                {
                    MethodName = this.MethodName,
                    RunAsynchronously = this.RunAsynchronously, 
                    TargetType = this.TargetType,
                    TargetObject = this.TargetObject, 
                    GenericTypeArguments = this.GenericTypeArguments, 
                    Parameters = this.Parameters,
                    Result = this.resultArgument, 
                    Parent = this
                };

            if (this.Result != null) 
            {
                resolver.ResultType = this.Result.ArgumentType; 
            } 
            else
            { 
                resolver.ResultType = typeof(object);
            }

            return resolver; 
        }
 
    } 
}

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

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