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 / Expressions / InvokeMethod.cs / 1305376 / InvokeMethod.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities.Expressions 
{
    using 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 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); 
 
            this.resultArgument = new RuntimeArgument("Result", typeof(TResult), ArgumentDirection.Out);
            metadata.Bind(this.Result, this.resultArgument); 
            arguments.Add(this.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 TResult EndExecute(AsyncCodeActivityContext context, IAsyncResult result) 
        { 
            this.methodExecutor.EndExecuteMethod(context, result);
            return this.Result.Get(context); 
        }

        MethodResolver CreateMethodResolver()
        { 
            return new MethodResolver
                { 
                    MethodName = this.MethodName, 
                    RunAsynchronously = this.RunAsynchronously,
                    TargetType = this.TargetType, 
                    TargetObject = this.TargetObject,
                    GenericTypeArguments = this.GenericTypeArguments,
                    Parameters = this.Parameters,
                    Result = this.resultArgument, 
                    ResultType = typeof(TResult),
                    Parent = this 
                }; 
        }
    } 
}

// 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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